From: Matthias Schmidt <gravatronics@live.com>
Date: Sat, 10 Feb 2018 13:45:10 +0000 (+0100)
Subject: Add `declare(strict_types=1);`
X-Git-Tag: 5.2.0_Alpha_1~140^2~57
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=308c880f7235735e55a6451ba07e2b13addb5855;p=GitHub%2FWoltLab%2FWCF.git

Add `declare(strict_types=1);`

See #2534
---

diff --git a/wcfsetup/install/files/lib/acp/action/AJAXInvokeAction.class.php b/wcfsetup/install/files/lib/acp/action/AJAXInvokeAction.class.php
index 65ed5fce4d..980e86884d 100644
--- a/wcfsetup/install/files/lib/acp/action/AJAXInvokeAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/AJAXInvokeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/action/AJAXProxyAction.class.php b/wcfsetup/install/files/lib/acp/action/AJAXProxyAction.class.php
index 7dc6ed21cf..6d384449f9 100755
--- a/wcfsetup/install/files/lib/acp/action/AJAXProxyAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/AJAXProxyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/action/AJAXUploadAction.class.php b/wcfsetup/install/files/lib/acp/action/AJAXUploadAction.class.php
index be5c34b3e1..d3d77748af 100644
--- a/wcfsetup/install/files/lib/acp/action/AJAXUploadAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/AJAXUploadAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/action/CacheClearAction.class.php b/wcfsetup/install/files/lib/acp/action/CacheClearAction.class.php
index d734d51f1a..36aa382cb4 100644
--- a/wcfsetup/install/files/lib/acp/action/CacheClearAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/CacheClearAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 use wcf\action\AbstractAction;
 use wcf\system\cache\CacheHandler;
diff --git a/wcfsetup/install/files/lib/acp/action/InstallPackageAction.class.php b/wcfsetup/install/files/lib/acp/action/InstallPackageAction.class.php
index 1db9891ab0..70f111c38c 100755
--- a/wcfsetup/install/files/lib/acp/action/InstallPackageAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/InstallPackageAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 use wcf\action\AbstractDialogAction;
 use wcf\data\application\Application;
diff --git a/wcfsetup/install/files/lib/acp/action/LogoutAction.class.php b/wcfsetup/install/files/lib/acp/action/LogoutAction.class.php
index 45ff9a4590..057b172da8 100755
--- a/wcfsetup/install/files/lib/acp/action/LogoutAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/LogoutAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 use wcf\action\AbstractSecureAction;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/acp/action/UninstallPackageAction.class.php b/wcfsetup/install/files/lib/acp/action/UninstallPackageAction.class.php
index 4947200cb6..cb6994ffe6 100644
--- a/wcfsetup/install/files/lib/acp/action/UninstallPackageAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/UninstallPackageAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 use wcf\action\AbstractDialogAction;
 use wcf\data\application\Application;
diff --git a/wcfsetup/install/files/lib/acp/action/UserQuickSearchAction.class.php b/wcfsetup/install/files/lib/acp/action/UserQuickSearchAction.class.php
index 5df34e0c63..eb83825c84 100644
--- a/wcfsetup/install/files/lib/acp/action/UserQuickSearchAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/UserQuickSearchAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 use wcf\data\search\SearchEditor;
 use wcf\action\AbstractAction;
diff --git a/wcfsetup/install/files/lib/acp/action/WorkerProxyAction.class.php b/wcfsetup/install/files/lib/acp/action/WorkerProxyAction.class.php
index 2e03139b3f..7b5edd0d18 100644
--- a/wcfsetup/install/files/lib/acp/action/WorkerProxyAction.class.php
+++ b/wcfsetup/install/files/lib/acp/action/WorkerProxyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\action;
 use wcf\action\AbstractSecureAction;
 use wcf\action\AJAXInvokeAction;
diff --git a/wcfsetup/install/files/lib/acp/form/AbstractAcpForm.class.php b/wcfsetup/install/files/lib/acp/form/AbstractAcpForm.class.php
index 068a2c09be..5b2abcdc59 100644
--- a/wcfsetup/install/files/lib/acp/form/AbstractAcpForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AbstractAcpForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\DatabaseObject;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/AbstractBulkProcessingForm.class.php b/wcfsetup/install/files/lib/acp/form/AbstractBulkProcessingForm.class.php
index 994dd53fb3..a92c1fbdf1 100644
--- a/wcfsetup/install/files/lib/acp/form/AbstractBulkProcessingForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AbstractBulkProcessingForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/acp/form/AbstractCategoryAddForm.class.php b/wcfsetup/install/files/lib/acp/form/AbstractCategoryAddForm.class.php
index 5e12fc62a0..ed56534aa2 100644
--- a/wcfsetup/install/files/lib/acp/form/AbstractCategoryAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AbstractCategoryAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\category\CategoryAction;
 use wcf\data\category\CategoryEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/AbstractCategoryEditForm.class.php b/wcfsetup/install/files/lib/acp/form/AbstractCategoryEditForm.class.php
index de7a8fd7d9..7721c8ffdf 100644
--- a/wcfsetup/install/files/lib/acp/form/AbstractCategoryEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AbstractCategoryEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\category\Category;
 use wcf\data\category\CategoryAction;
diff --git a/wcfsetup/install/files/lib/acp/form/AbstractCustomOptionForm.class.php b/wcfsetup/install/files/lib/acp/form/AbstractCustomOptionForm.class.php
index 7b635ade7d..eac4ce9f6d 100644
--- a/wcfsetup/install/files/lib/acp/form/AbstractCustomOptionForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AbstractCustomOptionForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\custom\option\CustomOption;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/acp/form/AbstractOptionListForm.class.php b/wcfsetup/install/files/lib/acp/form/AbstractOptionListForm.class.php
index 40e07da645..46801ef60a 100755
--- a/wcfsetup/install/files/lib/acp/form/AbstractOptionListForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AbstractOptionListForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\form\AbstractForm;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/acp/form/AdAddForm.class.php b/wcfsetup/install/files/lib/acp/form/AdAddForm.class.php
index 74f8a684ef..dadec47e9e 100644
--- a/wcfsetup/install/files/lib/acp/form/AdAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AdAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/acp/form/AdEditForm.class.php b/wcfsetup/install/files/lib/acp/form/AdEditForm.class.php
index db77ef16d3..d35fa064d8 100644
--- a/wcfsetup/install/files/lib/acp/form/AdEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/AdEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\ad\Ad;
 use wcf\data\ad\AdAction;
diff --git a/wcfsetup/install/files/lib/acp/form/ApplicationEditForm.class.php b/wcfsetup/install/files/lib/acp/form/ApplicationEditForm.class.php
index 16371a8def..f10578901e 100644
--- a/wcfsetup/install/files/lib/acp/form/ApplicationEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ApplicationEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\application\Application;
 use wcf\data\application\ApplicationAction;
diff --git a/wcfsetup/install/files/lib/acp/form/ArticleAddForm.class.php b/wcfsetup/install/files/lib/acp/form/ArticleAddForm.class.php
index 93173309ce..13f0817d3b 100644
--- a/wcfsetup/install/files/lib/acp/form/ArticleAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ArticleAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\Article;
diff --git a/wcfsetup/install/files/lib/acp/form/ArticleCategoryAddForm.class.php b/wcfsetup/install/files/lib/acp/form/ArticleCategoryAddForm.class.php
index 37b56e4adc..1839e7b6d7 100644
--- a/wcfsetup/install/files/lib/acp/form/ArticleCategoryAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ArticleCategoryAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/ArticleCategoryEditForm.class.php b/wcfsetup/install/files/lib/acp/form/ArticleCategoryEditForm.class.php
index 01dc6a7a3a..ea26fb3865 100644
--- a/wcfsetup/install/files/lib/acp/form/ArticleCategoryEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ArticleCategoryEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/ArticleEditForm.class.php b/wcfsetup/install/files/lib/acp/form/ArticleEditForm.class.php
index 6d5133a8ef..b1c8f1c34d 100644
--- a/wcfsetup/install/files/lib/acp/form/ArticleEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ArticleEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\article\Article;
 use wcf\data\article\ArticleAction;
diff --git a/wcfsetup/install/files/lib/acp/form/BBCodeAddForm.class.php b/wcfsetup/install/files/lib/acp/form/BBCodeAddForm.class.php
index e3c3a1089a..91aa84449d 100644
--- a/wcfsetup/install/files/lib/acp/form/BBCodeAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/BBCodeAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\bbcode\attribute\BBCodeAttributeAction;
 use wcf\data\bbcode\BBCode;
diff --git a/wcfsetup/install/files/lib/acp/form/BBCodeEditForm.class.php b/wcfsetup/install/files/lib/acp/form/BBCodeEditForm.class.php
index b056ba483f..03a8665b32 100644
--- a/wcfsetup/install/files/lib/acp/form/BBCodeEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/BBCodeEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\bbcode\attribute\BBCodeAttribute;
 use wcf\data\bbcode\attribute\BBCodeAttributeAction;
diff --git a/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderAddForm.class.php b/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderAddForm.class.php
index dd383367ab..7945d4518a 100644
--- a/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\bbcode\media\provider\BBCodeMediaProvider;
 use wcf\data\bbcode\media\provider\BBCodeMediaProviderAction;
diff --git a/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderEditForm.class.php b/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderEditForm.class.php
index 0c302a3fa0..6bad90aee6 100644
--- a/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/BBCodeMediaProviderEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\bbcode\media\provider\BBCodeMediaProvider;
 use wcf\data\bbcode\media\provider\BBCodeMediaProviderAction;
diff --git a/wcfsetup/install/files/lib/acp/form/BoxAddForm.class.php b/wcfsetup/install/files/lib/acp/form/BoxAddForm.class.php
index fee7e76c0c..a552f2701d 100644
--- a/wcfsetup/install/files/lib/acp/form/BoxAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/BoxAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\box\Box;
 use wcf\data\box\BoxAction;
diff --git a/wcfsetup/install/files/lib/acp/form/BoxEditForm.class.php b/wcfsetup/install/files/lib/acp/form/BoxEditForm.class.php
index 05bab23f36..45d925bbb8 100644
--- a/wcfsetup/install/files/lib/acp/form/BoxEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/BoxEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\box\Box;
 use wcf\data\box\BoxAction;
diff --git a/wcfsetup/install/files/lib/acp/form/CaptchaQuestionAddForm.class.php b/wcfsetup/install/files/lib/acp/form/CaptchaQuestionAddForm.class.php
index 814e28245f..9610cee3ba 100644
--- a/wcfsetup/install/files/lib/acp/form/CaptchaQuestionAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/CaptchaQuestionAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\captcha\question\CaptchaQuestionAction;
 use wcf\data\captcha\question\CaptchaQuestionEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/CaptchaQuestionEditForm.class.php b/wcfsetup/install/files/lib/acp/form/CaptchaQuestionEditForm.class.php
index 265d344ebd..31a570a0b9 100644
--- a/wcfsetup/install/files/lib/acp/form/CaptchaQuestionEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/CaptchaQuestionEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\captcha\question\CaptchaQuestion;
 use wcf\data\captcha\question\CaptchaQuestionAction;
diff --git a/wcfsetup/install/files/lib/acp/form/ContactOptionAddForm.class.php b/wcfsetup/install/files/lib/acp/form/ContactOptionAddForm.class.php
index a105291482..7458385bdf 100644
--- a/wcfsetup/install/files/lib/acp/form/ContactOptionAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ContactOptionAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\contact\option\ContactOption;
 use wcf\data\contact\option\ContactOptionAction;
diff --git a/wcfsetup/install/files/lib/acp/form/ContactOptionEditForm.class.php b/wcfsetup/install/files/lib/acp/form/ContactOptionEditForm.class.php
index 9c2d3acf96..3e1ab49703 100644
--- a/wcfsetup/install/files/lib/acp/form/ContactOptionEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ContactOptionEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/ContactRecipientAddForm.class.php b/wcfsetup/install/files/lib/acp/form/ContactRecipientAddForm.class.php
index b8f6562580..7209c93dde 100644
--- a/wcfsetup/install/files/lib/acp/form/ContactRecipientAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ContactRecipientAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\contact\recipient\ContactRecipient;
 use wcf\data\contact\recipient\ContactRecipientAction;
diff --git a/wcfsetup/install/files/lib/acp/form/ContactRecipientEditForm.class.php b/wcfsetup/install/files/lib/acp/form/ContactRecipientEditForm.class.php
index 0fbd82dfc7..cb16896a13 100644
--- a/wcfsetup/install/files/lib/acp/form/ContactRecipientEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/ContactRecipientEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\contact\recipient\ContactRecipient;
 use wcf\data\contact\recipient\ContactRecipientAction;
diff --git a/wcfsetup/install/files/lib/acp/form/CronjobAddForm.class.php b/wcfsetup/install/files/lib/acp/form/CronjobAddForm.class.php
index 366d9f28e9..3ab6fafff6 100755
--- a/wcfsetup/install/files/lib/acp/form/CronjobAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/CronjobAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\cronjob\CronjobAction;
diff --git a/wcfsetup/install/files/lib/acp/form/CronjobEditForm.class.php b/wcfsetup/install/files/lib/acp/form/CronjobEditForm.class.php
index ae0391d447..2d5a6c945e 100755
--- a/wcfsetup/install/files/lib/acp/form/CronjobEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/CronjobEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\cronjob\CronjobAction;
diff --git a/wcfsetup/install/files/lib/acp/form/DataImportForm.class.php b/wcfsetup/install/files/lib/acp/form/DataImportForm.class.php
index 41956634f6..5e13280263 100644
--- a/wcfsetup/install/files/lib/acp/form/DataImportForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/DataImportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\form\AbstractForm;
diff --git a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php
index e3bdcbf8dd..4e00fde270 100644
--- a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\data\devtools\project\DevtoolsProjectAction;
diff --git a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php
index 66a019653d..8fc9f62d06 100644
--- a/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/DevtoolsProjectEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\data\devtools\project\DevtoolsProjectAction;
diff --git a/wcfsetup/install/files/lib/acp/form/LabelAddForm.class.php b/wcfsetup/install/files/lib/acp/form/LabelAddForm.class.php
index f33daebc41..d960de0344 100644
--- a/wcfsetup/install/files/lib/acp/form/LabelAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LabelAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\label\group\LabelGroupList;
 use wcf\data\label\LabelAction;
diff --git a/wcfsetup/install/files/lib/acp/form/LabelEditForm.class.php b/wcfsetup/install/files/lib/acp/form/LabelEditForm.class.php
index 9f883497a4..17905b9a86 100644
--- a/wcfsetup/install/files/lib/acp/form/LabelEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LabelEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\label\Label;
 use wcf\data\label\LabelAction;
diff --git a/wcfsetup/install/files/lib/acp/form/LabelGroupAddForm.class.php b/wcfsetup/install/files/lib/acp/form/LabelGroupAddForm.class.php
index 212040ba40..624fadc923 100644
--- a/wcfsetup/install/files/lib/acp/form/LabelGroupAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LabelGroupAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\label\group\LabelGroupAction;
 use wcf\data\label\group\LabelGroupEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/LabelGroupEditForm.class.php b/wcfsetup/install/files/lib/acp/form/LabelGroupEditForm.class.php
index 174695eb72..8be9839ae4 100644
--- a/wcfsetup/install/files/lib/acp/form/LabelGroupEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LabelGroupEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\label\group\LabelGroup;
 use wcf\data\label\group\LabelGroupAction;
diff --git a/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php b/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php
index 0578a69490..ba6a679fec 100644
--- a/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\language\Language;
 use wcf\data\language\LanguageEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/LanguageEditForm.class.php b/wcfsetup/install/files/lib/acp/form/LanguageEditForm.class.php
index 7e10cc66e1..46be39ab03 100644
--- a/wcfsetup/install/files/lib/acp/form/LanguageEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LanguageEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\language\Language;
 use wcf\data\language\LanguageEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/LanguageExportForm.class.php b/wcfsetup/install/files/lib/acp/form/LanguageExportForm.class.php
index 35e0b0269c..4244ea4607 100644
--- a/wcfsetup/install/files/lib/acp/form/LanguageExportForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LanguageExportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\language\LanguageEditor;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/acp/form/LanguageImportForm.class.php b/wcfsetup/install/files/lib/acp/form/LanguageImportForm.class.php
index 921156a962..e9fb3bab16 100644
--- a/wcfsetup/install/files/lib/acp/form/LanguageImportForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LanguageImportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\language\Language;
 use wcf\data\language\LanguageEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/LanguageMultilingualismForm.class.php b/wcfsetup/install/files/lib/acp/form/LanguageMultilingualismForm.class.php
index fcc93ff36a..d076619172 100644
--- a/wcfsetup/install/files/lib/acp/form/LanguageMultilingualismForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LanguageMultilingualismForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\language\Language;
 use wcf\data\language\LanguageEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/LoginForm.class.php b/wcfsetup/install/files/lib/acp/form/LoginForm.class.php
index c9e42e0941..7e70c01633 100755
--- a/wcfsetup/install/files/lib/acp/form/LoginForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LoginForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\authentication\failure\UserAuthenticationFailure;
 use wcf\data\user\authentication\failure\UserAuthenticationFailureAction;
diff --git a/wcfsetup/install/files/lib/acp/form/MasterPasswordForm.class.php b/wcfsetup/install/files/lib/acp/form/MasterPasswordForm.class.php
index 464c46ea7c..8a7a3595f6 100755
--- a/wcfsetup/install/files/lib/acp/form/MasterPasswordForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MasterPasswordForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\form\AbstractForm;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/acp/form/MasterPasswordInitForm.class.php b/wcfsetup/install/files/lib/acp/form/MasterPasswordInitForm.class.php
index acc297f206..7c87aa2f6e 100755
--- a/wcfsetup/install/files/lib/acp/form/MasterPasswordInitForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MasterPasswordInitForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\form\AbstractForm;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/acp/form/MediaCategoryAddForm.class.php b/wcfsetup/install/files/lib/acp/form/MediaCategoryAddForm.class.php
index 0800bfb71b..b579cd9072 100644
--- a/wcfsetup/install/files/lib/acp/form/MediaCategoryAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MediaCategoryAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/MediaCategoryEditForm.class.php b/wcfsetup/install/files/lib/acp/form/MediaCategoryEditForm.class.php
index 710b6474c5..5fd67efbf8 100644
--- a/wcfsetup/install/files/lib/acp/form/MediaCategoryEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MediaCategoryEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/MenuAddForm.class.php b/wcfsetup/install/files/lib/acp/form/MenuAddForm.class.php
index 9e60537d5d..b6c1dfc1da 100644
--- a/wcfsetup/install/files/lib/acp/form/MenuAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MenuAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\box\Box;
 use wcf\data\menu\MenuAction;
diff --git a/wcfsetup/install/files/lib/acp/form/MenuEditForm.class.php b/wcfsetup/install/files/lib/acp/form/MenuEditForm.class.php
index 5ec14adf63..df7f8b36d3 100644
--- a/wcfsetup/install/files/lib/acp/form/MenuEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MenuEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\box\BoxAction;
 use wcf\data\menu\Menu;
diff --git a/wcfsetup/install/files/lib/acp/form/MenuItemAddForm.class.php b/wcfsetup/install/files/lib/acp/form/MenuItemAddForm.class.php
index 17ea62bd48..241ef548b3 100644
--- a/wcfsetup/install/files/lib/acp/form/MenuItemAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MenuItemAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\menu\item\MenuItem;
 use wcf\data\menu\item\MenuItemAction;
diff --git a/wcfsetup/install/files/lib/acp/form/MenuItemEditForm.class.php b/wcfsetup/install/files/lib/acp/form/MenuItemEditForm.class.php
index bc31337563..c04f002d00 100644
--- a/wcfsetup/install/files/lib/acp/form/MenuItemEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/MenuItemEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\menu\item\MenuItem;
 use wcf\data\menu\item\MenuItemAction;
diff --git a/wcfsetup/install/files/lib/acp/form/NoticeAddForm.class.php b/wcfsetup/install/files/lib/acp/form/NoticeAddForm.class.php
index 3749c6dc1e..eefc1441b4 100644
--- a/wcfsetup/install/files/lib/acp/form/NoticeAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/NoticeAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/acp/form/NoticeEditForm.class.php b/wcfsetup/install/files/lib/acp/form/NoticeEditForm.class.php
index a738abd3a0..23c0a73eb3 100644
--- a/wcfsetup/install/files/lib/acp/form/NoticeEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/NoticeEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\notice\Notice;
 use wcf\data\notice\NoticeAction;
diff --git a/wcfsetup/install/files/lib/acp/form/NotificationPresetSettingsForm.class.php b/wcfsetup/install/files/lib/acp/form/NotificationPresetSettingsForm.class.php
index a6592a1f09..c2473e1ce1 100644
--- a/wcfsetup/install/files/lib/acp/form/NotificationPresetSettingsForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/NotificationPresetSettingsForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\notification\event\UserNotificationEvent;
diff --git a/wcfsetup/install/files/lib/acp/form/OptionForm.class.php b/wcfsetup/install/files/lib/acp/form/OptionForm.class.php
index de316feb82..4cf46dc7f8 100644
--- a/wcfsetup/install/files/lib/acp/form/OptionForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/OptionForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\option\category\OptionCategory;
 use wcf\data\option\OptionAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PackageStartInstallForm.class.php b/wcfsetup/install/files/lib/acp/form/PackageStartInstallForm.class.php
index c8a6d5a31f..e7750aafd3 100755
--- a/wcfsetup/install/files/lib/acp/form/PackageStartInstallForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PackageStartInstallForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
 use wcf\data\package\installation\queue\PackageInstallationQueueEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/PackageUpdateServerAddForm.class.php b/wcfsetup/install/files/lib/acp/form/PackageUpdateServerAddForm.class.php
index 0f7e082474..a79eac22c5 100755
--- a/wcfsetup/install/files/lib/acp/form/PackageUpdateServerAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PackageUpdateServerAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\package\update\server\PackageUpdateServer;
 use wcf\data\package\update\server\PackageUpdateServerAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PackageUpdateServerEditForm.class.php b/wcfsetup/install/files/lib/acp/form/PackageUpdateServerEditForm.class.php
index 0a54948970..686649e036 100755
--- a/wcfsetup/install/files/lib/acp/form/PackageUpdateServerEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PackageUpdateServerEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\package\update\server\PackageUpdateServer;
 use wcf\data\package\update\server\PackageUpdateServerAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PageAddForm.class.php b/wcfsetup/install/files/lib/acp/form/PageAddForm.class.php
index 1715eb7054..24ef7510e6 100644
--- a/wcfsetup/install/files/lib/acp/form/PageAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PageAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\application\Application;
 use wcf\data\application\ApplicationList;
diff --git a/wcfsetup/install/files/lib/acp/form/PageEditForm.class.php b/wcfsetup/install/files/lib/acp/form/PageEditForm.class.php
index 6907a0eff6..917f26be4f 100644
--- a/wcfsetup/install/files/lib/acp/form/PageEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PageEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\page\Page;
 use wcf\data\page\PageAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionAddForm.class.php b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionAddForm.class.php
index 602e4f1db5..af5f776ef9 100644
--- a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\paid\subscription\PaidSubscription;
 use wcf\data\paid\subscription\PaidSubscriptionAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionEditForm.class.php b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionEditForm.class.php
index 3b3a12c54b..49869b012e 100644
--- a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\paid\subscription\PaidSubscription;
 use wcf\data\paid\subscription\PaidSubscriptionAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserAddForm.class.php b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserAddForm.class.php
index 05a7c89776..1267c401a1 100644
--- a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\paid\subscription\user\PaidSubscriptionUser;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserAction;
diff --git a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserEditForm.class.php b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserEditForm.class.php
index 455cd05df8..98cff61dcc 100644
--- a/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/PaidSubscriptionUserEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\paid\subscription\user\PaidSubscriptionUser;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserAction;
diff --git a/wcfsetup/install/files/lib/acp/form/RescueModeForm.class.php b/wcfsetup/install/files/lib/acp/form/RescueModeForm.class.php
index c4c317d6c3..4863408c6c 100644
--- a/wcfsetup/install/files/lib/acp/form/RescueModeForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/RescueModeForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\application\Application;
 use wcf\data\application\ApplicationAction;
diff --git a/wcfsetup/install/files/lib/acp/form/SitemapEditForm.class.php b/wcfsetup/install/files/lib/acp/form/SitemapEditForm.class.php
index 9b94c075b6..64bcc028c8 100755
--- a/wcfsetup/install/files/lib/acp/form/SitemapEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/SitemapEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeAction;
diff --git a/wcfsetup/install/files/lib/acp/form/SmileyAddForm.class.php b/wcfsetup/install/files/lib/acp/form/SmileyAddForm.class.php
index 3437d1147d..b198712379 100644
--- a/wcfsetup/install/files/lib/acp/form/SmileyAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/SmileyAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\category\Category;
 use wcf\data\category\CategoryNodeTree;
diff --git a/wcfsetup/install/files/lib/acp/form/SmileyCategoryAddForm.class.php b/wcfsetup/install/files/lib/acp/form/SmileyCategoryAddForm.class.php
index 90877e9aed..c4e163ab31 100644
--- a/wcfsetup/install/files/lib/acp/form/SmileyCategoryAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/SmileyCategoryAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/SmileyCategoryEditForm.class.php b/wcfsetup/install/files/lib/acp/form/SmileyCategoryEditForm.class.php
index 8249ff5bc7..92fa376ce1 100644
--- a/wcfsetup/install/files/lib/acp/form/SmileyCategoryEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/SmileyCategoryEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/SmileyEditForm.class.php b/wcfsetup/install/files/lib/acp/form/SmileyEditForm.class.php
index 82b82dcbf9..d3b460daaf 100644
--- a/wcfsetup/install/files/lib/acp/form/SmileyEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/SmileyEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\smiley\Smiley;
 use wcf\data\smiley\SmileyAction;
diff --git a/wcfsetup/install/files/lib/acp/form/StyleAddForm.class.php b/wcfsetup/install/files/lib/acp/form/StyleAddForm.class.php
index afdecdad5c..51a06dd8b6 100644
--- a/wcfsetup/install/files/lib/acp/form/StyleAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/StyleAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\package\Package;
 use wcf\data\style\Style;
diff --git a/wcfsetup/install/files/lib/acp/form/StyleEditForm.class.php b/wcfsetup/install/files/lib/acp/form/StyleEditForm.class.php
index 2ddc531f2e..5109f51973 100644
--- a/wcfsetup/install/files/lib/acp/form/StyleEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/StyleEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\style\Style;
 use wcf\data\style\StyleAction;
diff --git a/wcfsetup/install/files/lib/acp/form/StyleExportForm.class.php b/wcfsetup/install/files/lib/acp/form/StyleExportForm.class.php
index 914265b962..5227932e54 100644
--- a/wcfsetup/install/files/lib/acp/form/StyleExportForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/StyleExportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\style\Style;
 use wcf\data\style\StyleEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/StyleGlobalValuesForm.class.php b/wcfsetup/install/files/lib/acp/form/StyleGlobalValuesForm.class.php
index cc945adcdf..413e9e7385 100644
--- a/wcfsetup/install/files/lib/acp/form/StyleGlobalValuesForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/StyleGlobalValuesForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\form\AbstractForm;
 use wcf\system\registry\RegistryHandler;
diff --git a/wcfsetup/install/files/lib/acp/form/StyleImportForm.class.php b/wcfsetup/install/files/lib/acp/form/StyleImportForm.class.php
index 0c648fcac6..c53459cd5f 100644
--- a/wcfsetup/install/files/lib/acp/form/StyleImportForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/StyleImportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\style\StyleEditor;
 use wcf\form\AbstractForm;
diff --git a/wcfsetup/install/files/lib/acp/form/TagAddForm.class.php b/wcfsetup/install/files/lib/acp/form/TagAddForm.class.php
index 05d6fd7457..3a28fa066e 100644
--- a/wcfsetup/install/files/lib/acp/form/TagAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TagAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\tag\Tag;
 use wcf\data\tag\TagAction;
diff --git a/wcfsetup/install/files/lib/acp/form/TagEditForm.class.php b/wcfsetup/install/files/lib/acp/form/TagEditForm.class.php
index 34f7b7684b..83d4cf123e 100644
--- a/wcfsetup/install/files/lib/acp/form/TagEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TagEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\tag\Tag;
 use wcf\data\tag\TagAction;
diff --git a/wcfsetup/install/files/lib/acp/form/TemplateAddForm.class.php b/wcfsetup/install/files/lib/acp/form/TemplateAddForm.class.php
index 86bc313f17..70b41991bf 100644
--- a/wcfsetup/install/files/lib/acp/form/TemplateAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TemplateAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\package\Package;
 use wcf\data\package\PackageCache;
diff --git a/wcfsetup/install/files/lib/acp/form/TemplateEditForm.class.php b/wcfsetup/install/files/lib/acp/form/TemplateEditForm.class.php
index 0700d06c89..5d98c54aa1 100644
--- a/wcfsetup/install/files/lib/acp/form/TemplateEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TemplateEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\template\Template;
 use wcf\data\template\TemplateAction;
diff --git a/wcfsetup/install/files/lib/acp/form/TemplateGroupAddForm.class.php b/wcfsetup/install/files/lib/acp/form/TemplateGroupAddForm.class.php
index 89af9eb648..472069fbbc 100644
--- a/wcfsetup/install/files/lib/acp/form/TemplateGroupAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TemplateGroupAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\template\group\TemplateGroup;
 use wcf\data\template\group\TemplateGroupAction;
diff --git a/wcfsetup/install/files/lib/acp/form/TemplateGroupEditForm.class.php b/wcfsetup/install/files/lib/acp/form/TemplateGroupEditForm.class.php
index dda2f16b2a..8706bab9ca 100644
--- a/wcfsetup/install/files/lib/acp/form/TemplateGroupEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TemplateGroupEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\template\group\TemplateGroup;
 use wcf\data\template\group\TemplateGroupAction;
diff --git a/wcfsetup/install/files/lib/acp/form/TrophyAddForm.class.php b/wcfsetup/install/files/lib/acp/form/TrophyAddForm.class.php
index 67b15bc314..80455a3e8b 100644
--- a/wcfsetup/install/files/lib/acp/form/TrophyAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TrophyAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\category\Category;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/acp/form/TrophyCategoryAddForm.class.php b/wcfsetup/install/files/lib/acp/form/TrophyCategoryAddForm.class.php
index dc2c3134ed..e4169acd21 100644
--- a/wcfsetup/install/files/lib/acp/form/TrophyCategoryAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TrophyCategoryAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/TrophyCategoryEditForm.class.php b/wcfsetup/install/files/lib/acp/form/TrophyCategoryEditForm.class.php
index 1d59fbf3e9..1939306117 100644
--- a/wcfsetup/install/files/lib/acp/form/TrophyCategoryEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TrophyCategoryEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/TrophyEditForm.class.php b/wcfsetup/install/files/lib/acp/form/TrophyEditForm.class.php
index 903f61389a..a5773da065 100644
--- a/wcfsetup/install/files/lib/acp/form/TrophyEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/TrophyEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\trophy\Trophy;
 use wcf\data\trophy\TrophyAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserActivityPointOptionForm.class.php b/wcfsetup/install/files/lib/acp/form/UserActivityPointOptionForm.class.php
index 879a5a7435..96085f2cac 100644
--- a/wcfsetup/install/files/lib/acp/form/UserActivityPointOptionForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserActivityPointOptionForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/acp/form/UserAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserAddForm.class.php
index d8030440eb..42bbadc610 100644
--- a/wcfsetup/install/files/lib/acp/form/UserAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserAssignToGroupForm.class.php b/wcfsetup/install/files/lib/acp/form/UserAssignToGroupForm.class.php
index af399fdde6..5c77ec4d09 100755
--- a/wcfsetup/install/files/lib/acp/form/UserAssignToGroupForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserAssignToGroupForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/acp/form/UserBulkProcessingForm.class.php b/wcfsetup/install/files/lib/acp/form/UserBulkProcessingForm.class.php
index 7e4f92ede3..fa67856f5a 100644
--- a/wcfsetup/install/files/lib/acp/form/UserBulkProcessingForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserBulkProcessingForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/form/UserContentRevertChangesForm.class.php b/wcfsetup/install/files/lib/acp/form/UserContentRevertChangesForm.class.php
index 969e7fe1d5..6c674ada13 100644
--- a/wcfsetup/install/files/lib/acp/form/UserContentRevertChangesForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserContentRevertChangesForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\User;
 use wcf\form\AbstractForm;
diff --git a/wcfsetup/install/files/lib/acp/form/UserEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserEditForm.class.php
index b29880d29a..640cdfb953 100755
--- a/wcfsetup/install/files/lib/acp/form/UserEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\avatar\Gravatar;
 use wcf\data\user\avatar\UserAvatar;
diff --git a/wcfsetup/install/files/lib/acp/form/UserEmailAddressExportForm.class.php b/wcfsetup/install/files/lib/acp/form/UserEmailAddressExportForm.class.php
index 3daa5c6839..d3080d2150 100755
--- a/wcfsetup/install/files/lib/acp/form/UserEmailAddressExportForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserEmailAddressExportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\User;
 use wcf\form\AbstractForm;
diff --git a/wcfsetup/install/files/lib/acp/form/UserGroupAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserGroupAddForm.class.php
index 7ab466d9c4..5d666c5065 100755
--- a/wcfsetup/install/files/lib/acp/form/UserGroupAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserGroupAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroupAction;
 use wcf\data\user\group\UserGroupEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentAddForm.class.php
index 6a01444e93..8ff9e94b7d 100644
--- a/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectType;
 use wcf\data\user\group\assignment\UserGroupAssignmentAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentEditForm.class.php
index 51265154e2..63c3c3d17e 100644
--- a/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserGroupAssignmentEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\assignment\UserGroupAssignment;
 use wcf\data\user\group\assignment\UserGroupAssignmentAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserGroupEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserGroupEditForm.class.php
index fd5a2e06ff..530996c303 100755
--- a/wcfsetup/install/files/lib/acp/form/UserGroupEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserGroupEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\group\UserGroupAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserGroupOptionForm.class.php b/wcfsetup/install/files/lib/acp/form/UserGroupOptionForm.class.php
index 435b2e4d66..2a1aadffb9 100644
--- a/wcfsetup/install/files/lib/acp/form/UserGroupOptionForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserGroupOptionForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\option\category\UserGroupOptionCategory;
 use wcf\data\user\group\option\category\UserGroupOptionCategoryList;
diff --git a/wcfsetup/install/files/lib/acp/form/UserMailForm.class.php b/wcfsetup/install/files/lib/acp/form/UserMailForm.class.php
index bbae5cb866..b5999c22dd 100755
--- a/wcfsetup/install/files/lib/acp/form/UserMailForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserMailForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\UserList;
diff --git a/wcfsetup/install/files/lib/acp/form/UserMergeForm.class.php b/wcfsetup/install/files/lib/acp/form/UserMergeForm.class.php
index 3d7e84f437..f8793e3a54 100644
--- a/wcfsetup/install/files/lib/acp/form/UserMergeForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserMergeForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/acp/form/UserOptionAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserOptionAddForm.class.php
index 4e319f6a79..159b2a4bae 100644
--- a/wcfsetup/install/files/lib/acp/form/UserOptionAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserOptionAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\option\category\UserOptionCategory;
 use wcf\data\user\option\category\UserOptionCategoryList;
diff --git a/wcfsetup/install/files/lib/acp/form/UserOptionCategoryAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserOptionCategoryAddForm.class.php
index 4b1322c5a9..d8bf86e17d 100644
--- a/wcfsetup/install/files/lib/acp/form/UserOptionCategoryAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserOptionCategoryAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\option\category\UserOptionCategoryAction;
 use wcf\data\user\option\category\UserOptionCategoryEditor;
diff --git a/wcfsetup/install/files/lib/acp/form/UserOptionCategoryEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserOptionCategoryEditForm.class.php
index 2346e9275b..93a0abe89c 100644
--- a/wcfsetup/install/files/lib/acp/form/UserOptionCategoryEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserOptionCategoryEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\option\category\UserOptionCategory;
 use wcf\data\user\option\category\UserOptionCategoryAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserOptionEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserOptionEditForm.class.php
index 0bf09e5fda..6135269de5 100644
--- a/wcfsetup/install/files/lib/acp/form/UserOptionEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserOptionEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\option\UserOptionAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserOptionListForm.class.php b/wcfsetup/install/files/lib/acp/form/UserOptionListForm.class.php
index 86a6ea9a13..5cedaf2ad1 100644
--- a/wcfsetup/install/files/lib/acp/form/UserOptionListForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserOptionListForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroup;
 use wcf\system\language\LanguageFactory;
diff --git a/wcfsetup/install/files/lib/acp/form/UserOptionSetDefaultsForm.class.php b/wcfsetup/install/files/lib/acp/form/UserOptionSetDefaultsForm.class.php
index 603a90284e..05fe42ee40 100644
--- a/wcfsetup/install/files/lib/acp/form/UserOptionSetDefaultsForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserOptionSetDefaultsForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\form\AbstractForm;
 use wcf\system\cache\builder\UserOptionCacheBuilder;
diff --git a/wcfsetup/install/files/lib/acp/form/UserRankAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserRankAddForm.class.php
index d993b752c1..11d2b197e3 100644
--- a/wcfsetup/install/files/lib/acp/form/UserRankAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserRankAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\rank\UserRankAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserRankEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserRankEditForm.class.php
index 458b4ed349..cbd3de1ae9 100644
--- a/wcfsetup/install/files/lib/acp/form/UserRankEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserRankEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\rank\UserRank;
 use wcf\data\user\rank\UserRankAction;
diff --git a/wcfsetup/install/files/lib/acp/form/UserSearchForm.class.php b/wcfsetup/install/files/lib/acp/form/UserSearchForm.class.php
index 85011dfdb0..5159a3df5f 100755
--- a/wcfsetup/install/files/lib/acp/form/UserSearchForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserSearchForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\condition\Condition;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/acp/form/UserTrophyAddForm.class.php b/wcfsetup/install/files/lib/acp/form/UserTrophyAddForm.class.php
index 08906ff84b..21d5187fbc 100644
--- a/wcfsetup/install/files/lib/acp/form/UserTrophyAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserTrophyAddForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\trophy\category\TrophyCategoryCache;
 use wcf\data\trophy\Trophy;
diff --git a/wcfsetup/install/files/lib/acp/form/UserTrophyEditForm.class.php b/wcfsetup/install/files/lib/acp/form/UserTrophyEditForm.class.php
index 3afaecf308..509bcfb4e1 100644
--- a/wcfsetup/install/files/lib/acp/form/UserTrophyEditForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/UserTrophyEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\form;
 use wcf\data\user\trophy\UserTrophy;
 use wcf\data\user\trophy\UserTrophyAction;
diff --git a/wcfsetup/install/files/lib/acp/page/ACPSessionLogListPage.class.php b/wcfsetup/install/files/lib/acp/page/ACPSessionLogListPage.class.php
index 185d0a1937..5df9541807 100755
--- a/wcfsetup/install/files/lib/acp/page/ACPSessionLogListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ACPSessionLogListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\acp\session\log\ACPSessionLogList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/ACPSessionLogPage.class.php b/wcfsetup/install/files/lib/acp/page/ACPSessionLogPage.class.php
index 7638d018fc..e954ab62e2 100755
--- a/wcfsetup/install/files/lib/acp/page/ACPSessionLogPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ACPSessionLogPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\acp\session\access\log\ACPSessionAccessLogList;
 use wcf\data\acp\session\log\ACPSessionLog;
diff --git a/wcfsetup/install/files/lib/acp/page/AbstractCategoryListPage.class.php b/wcfsetup/install/files/lib/acp/page/AbstractCategoryListPage.class.php
index 3814434910..1a5bb0f119 100644
--- a/wcfsetup/install/files/lib/acp/page/AbstractCategoryListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/AbstractCategoryListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\category\CategoryNodeTree;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/acp/page/AdListPage.class.php b/wcfsetup/install/files/lib/acp/page/AdListPage.class.php
index 8e0bf8d797..3daa690f8f 100644
--- a/wcfsetup/install/files/lib/acp/page/AdListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/AdListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\ad\AdList;
 use wcf\page\MultipleLinkPage;
diff --git a/wcfsetup/install/files/lib/acp/page/ApplicationManagementPage.class.php b/wcfsetup/install/files/lib/acp/page/ApplicationManagementPage.class.php
index 5da26db0b2..e8d6b217cf 100644
--- a/wcfsetup/install/files/lib/acp/page/ApplicationManagementPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ApplicationManagementPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\application\ViewableApplicationList;
 use wcf\data\page\PageList;
diff --git a/wcfsetup/install/files/lib/acp/page/ArticleCategoryListPage.class.php b/wcfsetup/install/files/lib/acp/page/ArticleCategoryListPage.class.php
index adcda3ef01..b69c86a49f 100644
--- a/wcfsetup/install/files/lib/acp/page/ArticleCategoryListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ArticleCategoryListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/page/ArticleListPage.class.php b/wcfsetup/install/files/lib/acp/page/ArticleListPage.class.php
index ce66c44f2e..8fa2191c19 100644
--- a/wcfsetup/install/files/lib/acp/page/ArticleListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ArticleListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\article\Article;
 use wcf\data\article\ArticleList;
diff --git a/wcfsetup/install/files/lib/acp/page/AttachmentListPage.class.php b/wcfsetup/install/files/lib/acp/page/AttachmentListPage.class.php
index 2b1dff2264..7af59ff7bc 100644
--- a/wcfsetup/install/files/lib/acp/page/AttachmentListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/AttachmentListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\attachment\AdministrativeAttachmentList;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/acp/page/AttachmentPage.class.php b/wcfsetup/install/files/lib/acp/page/AttachmentPage.class.php
index dd9711dff5..e24eb98264 100644
--- a/wcfsetup/install/files/lib/acp/page/AttachmentPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/AttachmentPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/BBCodeListPage.class.php b/wcfsetup/install/files/lib/acp/page/BBCodeListPage.class.php
index 6a6207ac83..62b06309f0 100644
--- a/wcfsetup/install/files/lib/acp/page/BBCodeListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/BBCodeListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\bbcode\BBCodeList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/BBCodeMediaProviderListPage.class.php b/wcfsetup/install/files/lib/acp/page/BBCodeMediaProviderListPage.class.php
index 23adf0f127..51059b1753 100644
--- a/wcfsetup/install/files/lib/acp/page/BBCodeMediaProviderListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/BBCodeMediaProviderListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\bbcode\media\provider\BBCodeMediaProviderList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/BoxListPage.class.php b/wcfsetup/install/files/lib/acp/page/BoxListPage.class.php
index 8e0ea2be60..685391808b 100644
--- a/wcfsetup/install/files/lib/acp/page/BoxListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/BoxListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\box\Box;
 use wcf\data\box\BoxList;
diff --git a/wcfsetup/install/files/lib/acp/page/CacheListPage.class.php b/wcfsetup/install/files/lib/acp/page/CacheListPage.class.php
index 20fff65440..11fafe1c91 100755
--- a/wcfsetup/install/files/lib/acp/page/CacheListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/CacheListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\page\AbstractPage;
 use wcf\system\cache\CacheHandler;
diff --git a/wcfsetup/install/files/lib/acp/page/CaptchaQuestionListPage.class.php b/wcfsetup/install/files/lib/acp/page/CaptchaQuestionListPage.class.php
index 0f4fcce536..355a0b3e6d 100644
--- a/wcfsetup/install/files/lib/acp/page/CaptchaQuestionListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/CaptchaQuestionListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\captcha\question\CaptchaQuestionList;
 use wcf\page\MultipleLinkPage;
diff --git a/wcfsetup/install/files/lib/acp/page/ContactSettingsPage.class.php b/wcfsetup/install/files/lib/acp/page/ContactSettingsPage.class.php
index 8c9a9829c4..7aa8e8b816 100644
--- a/wcfsetup/install/files/lib/acp/page/ContactSettingsPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ContactSettingsPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\contact\option\ContactOptionList;
 use wcf\data\contact\recipient\ContactRecipientList;
diff --git a/wcfsetup/install/files/lib/acp/page/CronjobListPage.class.php b/wcfsetup/install/files/lib/acp/page/CronjobListPage.class.php
index 9c9d10f474..d4e4a4bbfe 100755
--- a/wcfsetup/install/files/lib/acp/page/CronjobListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/CronjobListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\cronjob\CronjobList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/CronjobLogListPage.class.php b/wcfsetup/install/files/lib/acp/page/CronjobLogListPage.class.php
index 5430dcbc1b..c7073528fa 100755
--- a/wcfsetup/install/files/lib/acp/page/CronjobLogListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/CronjobLogListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\cronjob\log\CronjobLogList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/DevtoolsNotificationTestPage.class.php b/wcfsetup/install/files/lib/acp/page/DevtoolsNotificationTestPage.class.php
index 9b4f2ba9da..ed43020c4d 100644
--- a/wcfsetup/install/files/lib/acp/page/DevtoolsNotificationTestPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/DevtoolsNotificationTestPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php b/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php
index aa1df7cb4e..747e90cb4b 100644
--- a/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/DevtoolsProjectListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\devtools\project\DevtoolsProjectList;
 use wcf\page\MultipleLinkPage;
diff --git a/wcfsetup/install/files/lib/acp/page/DevtoolsProjectSyncPage.class.php b/wcfsetup/install/files/lib/acp/page/DevtoolsProjectSyncPage.class.php
index d8cf314f26..cd8d4a00a6 100644
--- a/wcfsetup/install/files/lib/acp/page/DevtoolsProjectSyncPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/DevtoolsProjectSyncPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/ExceptionLogViewPage.class.php b/wcfsetup/install/files/lib/acp/page/ExceptionLogViewPage.class.php
index 3327c3672e..325eb9b81b 100644
--- a/wcfsetup/install/files/lib/acp/page/ExceptionLogViewPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/ExceptionLogViewPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\page\AbstractPage;
 use wcf\page\MultipleLinkPage;
diff --git a/wcfsetup/install/files/lib/acp/page/IndexPage.class.php b/wcfsetup/install/files/lib/acp/page/IndexPage.class.php
index ef323b865a..7e108362f4 100755
--- a/wcfsetup/install/files/lib/acp/page/IndexPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/IndexPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\page\AbstractPage;
 use wcf\system\package\PackageInstallationDispatcher;
diff --git a/wcfsetup/install/files/lib/acp/page/LabelGroupListPage.class.php b/wcfsetup/install/files/lib/acp/page/LabelGroupListPage.class.php
index 6037af91e4..9193204bdc 100644
--- a/wcfsetup/install/files/lib/acp/page/LabelGroupListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/LabelGroupListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\label\group\LabelGroupList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/LabelListPage.class.php b/wcfsetup/install/files/lib/acp/page/LabelListPage.class.php
index 52b8affc6a..f196903c7a 100644
--- a/wcfsetup/install/files/lib/acp/page/LabelListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/LabelListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\label\group\LabelGroup;
 use wcf\data\label\group\LabelGroupList;
diff --git a/wcfsetup/install/files/lib/acp/page/LanguageItemListPage.class.php b/wcfsetup/install/files/lib/acp/page/LanguageItemListPage.class.php
index dbabb6d339..a03cefad8f 100644
--- a/wcfsetup/install/files/lib/acp/page/LanguageItemListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/LanguageItemListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\language\category\LanguageCategoryList;
 use wcf\data\language\item\LanguageItemList;
diff --git a/wcfsetup/install/files/lib/acp/page/LanguageListPage.class.php b/wcfsetup/install/files/lib/acp/page/LanguageListPage.class.php
index a322ed5bc2..14afe60617 100644
--- a/wcfsetup/install/files/lib/acp/page/LanguageListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/LanguageListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\language\LanguageList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/MediaCategoryListPage.class.php b/wcfsetup/install/files/lib/acp/page/MediaCategoryListPage.class.php
index dfce5326f3..4ae26e7a66 100644
--- a/wcfsetup/install/files/lib/acp/page/MediaCategoryListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/MediaCategoryListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/page/MediaListPage.class.php b/wcfsetup/install/files/lib/acp/page/MediaListPage.class.php
index a5bdb0104c..7a7c5d0d43 100644
--- a/wcfsetup/install/files/lib/acp/page/MediaListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/MediaListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\category\CategoryNodeTree;
 use wcf\data\media\ViewableMediaList;
diff --git a/wcfsetup/install/files/lib/acp/page/MediaPage.class.php b/wcfsetup/install/files/lib/acp/page/MediaPage.class.php
index e5d859801e..fd2d0abb29 100644
--- a/wcfsetup/install/files/lib/acp/page/MediaPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/MediaPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/page/MenuItemListPage.class.php b/wcfsetup/install/files/lib/acp/page/MenuItemListPage.class.php
index 1c557a2d7e..7b3479222f 100644
--- a/wcfsetup/install/files/lib/acp/page/MenuItemListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/MenuItemListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\menu\item\MenuItemNodeTree;
 use wcf\data\menu\Menu;
diff --git a/wcfsetup/install/files/lib/acp/page/MenuListPage.class.php b/wcfsetup/install/files/lib/acp/page/MenuListPage.class.php
index fcdfe66bdd..a987d435e6 100644
--- a/wcfsetup/install/files/lib/acp/page/MenuListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/MenuListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\menu\MenuList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/NoticeListPage.class.php b/wcfsetup/install/files/lib/acp/page/NoticeListPage.class.php
index 6b5c6c0370..16d8c99c8b 100644
--- a/wcfsetup/install/files/lib/acp/page/NoticeListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/NoticeListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\notice\NoticeList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/PHPInfoPage.class.php b/wcfsetup/install/files/lib/acp/page/PHPInfoPage.class.php
index 21eea6e474..90ee33eeaa 100644
--- a/wcfsetup/install/files/lib/acp/page/PHPInfoPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PHPInfoPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\page\AbstractPage;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/acp/page/PackageInstallationConfirmPage.class.php b/wcfsetup/install/files/lib/acp/page/PackageInstallationConfirmPage.class.php
index a17dfda491..42672cb6bb 100644
--- a/wcfsetup/install/files/lib/acp/page/PackageInstallationConfirmPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PackageInstallationConfirmPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/PackageListPage.class.php b/wcfsetup/install/files/lib/acp/page/PackageListPage.class.php
index c8819c2b8d..672cd98525 100644
--- a/wcfsetup/install/files/lib/acp/page/PackageListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PackageListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\package\PackageList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/PackagePage.class.php b/wcfsetup/install/files/lib/acp/page/PackagePage.class.php
index 6323802606..3683822f09 100755
--- a/wcfsetup/install/files/lib/acp/page/PackagePage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PackagePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\package\Package;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/PackageUpdatePage.class.php b/wcfsetup/install/files/lib/acp/page/PackageUpdatePage.class.php
index 6f39009a27..35b8fa8033 100644
--- a/wcfsetup/install/files/lib/acp/page/PackageUpdatePage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PackageUpdatePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\page\AbstractPage;
 use wcf\system\package\PackageUpdateDispatcher;
diff --git a/wcfsetup/install/files/lib/acp/page/PackageUpdateServerListPage.class.php b/wcfsetup/install/files/lib/acp/page/PackageUpdateServerListPage.class.php
index 59a0733689..a5f0218a98 100755
--- a/wcfsetup/install/files/lib/acp/page/PackageUpdateServerListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PackageUpdateServerListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\package\update\server\PackageUpdateServerList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/PageBoxOrderPage.class.php b/wcfsetup/install/files/lib/acp/page/PageBoxOrderPage.class.php
index a6c090f73d..01d976e9a7 100644
--- a/wcfsetup/install/files/lib/acp/page/PageBoxOrderPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PageBoxOrderPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\box\Box;
 use wcf\data\page\Page;
diff --git a/wcfsetup/install/files/lib/acp/page/PageListPage.class.php b/wcfsetup/install/files/lib/acp/page/PageListPage.class.php
index dc9bc49e69..a3abdf0769 100644
--- a/wcfsetup/install/files/lib/acp/page/PageListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PageListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\application\Application;
 use wcf\data\application\ApplicationList;
diff --git a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionListPage.class.php b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionListPage.class.php
index b3ad1481b0..3d72fffe17 100644
--- a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\paid\subscription\PaidSubscriptionList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogListPage.class.php b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogListPage.class.php
index df2079bdf2..f787b91c22 100644
--- a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\paid\subscription\transaction\log\PaidSubscriptionTransactionLogList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogPage.class.php b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogPage.class.php
index 5461322e89..2888d8866b 100644
--- a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionTransactionLogPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\paid\subscription\transaction\log\PaidSubscriptionTransactionLog;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionUserListPage.class.php b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionUserListPage.class.php
index da5e62f47d..3b77e0f0af 100644
--- a/wcfsetup/install/files/lib/acp/page/PaidSubscriptionUserListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PaidSubscriptionUserListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/PluginStorePurchasedItemsPage.class.php b/wcfsetup/install/files/lib/acp/page/PluginStorePurchasedItemsPage.class.php
index 6fd5ada864..e1571de0fd 100644
--- a/wcfsetup/install/files/lib/acp/page/PluginStorePurchasedItemsPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/PluginStorePurchasedItemsPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\package\update\server\PackageUpdateServer;
 use wcf\data\package\update\server\PackageUpdateServerList;
diff --git a/wcfsetup/install/files/lib/acp/page/RebuildDataPage.class.php b/wcfsetup/install/files/lib/acp/page/RebuildDataPage.class.php
index 9e5711a1d5..ccd87e8375 100644
--- a/wcfsetup/install/files/lib/acp/page/RebuildDataPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/RebuildDataPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/SitemapListPage.class.php b/wcfsetup/install/files/lib/acp/page/SitemapListPage.class.php
index d2e1cbb672..54e77f29ed 100755
--- a/wcfsetup/install/files/lib/acp/page/SitemapListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/SitemapListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/SmileyCategoryListPage.class.php b/wcfsetup/install/files/lib/acp/page/SmileyCategoryListPage.class.php
index 6ee8d670a3..f3793e8a03 100644
--- a/wcfsetup/install/files/lib/acp/page/SmileyCategoryListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/SmileyCategoryListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/page/SmileyListPage.class.php b/wcfsetup/install/files/lib/acp/page/SmileyListPage.class.php
index 1e2c7789ae..e477bb2ccf 100644
--- a/wcfsetup/install/files/lib/acp/page/SmileyListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/SmileyListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\category\Category;
 use wcf\data\smiley\category\SmileyCategory;
diff --git a/wcfsetup/install/files/lib/acp/page/StatPage.class.php b/wcfsetup/install/files/lib/acp/page/StatPage.class.php
index bc6974efa8..1a2f3342cf 100644
--- a/wcfsetup/install/files/lib/acp/page/StatPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/StatPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/StyleListPage.class.php b/wcfsetup/install/files/lib/acp/page/StyleListPage.class.php
index 2ec5ba2d6b..534824ccd6 100644
--- a/wcfsetup/install/files/lib/acp/page/StyleListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/StyleListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\style\StyleList;
 use wcf\page\MultipleLinkPage;
diff --git a/wcfsetup/install/files/lib/acp/page/TagListPage.class.php b/wcfsetup/install/files/lib/acp/page/TagListPage.class.php
index 58674ae7a3..b2a78d18d9 100644
--- a/wcfsetup/install/files/lib/acp/page/TagListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/TagListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\tag\TagList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/TemplateDiffPage.class.php b/wcfsetup/install/files/lib/acp/page/TemplateDiffPage.class.php
index d91067508e..e7f1163bec 100644
--- a/wcfsetup/install/files/lib/acp/page/TemplateDiffPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/TemplateDiffPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\template\group\TemplateGroupList;
 use wcf\data\template\Template;
diff --git a/wcfsetup/install/files/lib/acp/page/TemplateGroupListPage.class.php b/wcfsetup/install/files/lib/acp/page/TemplateGroupListPage.class.php
index f3a1267983..2e7b6d0aca 100644
--- a/wcfsetup/install/files/lib/acp/page/TemplateGroupListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/TemplateGroupListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\template\group\TemplateGroupList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/TemplateListPage.class.php b/wcfsetup/install/files/lib/acp/page/TemplateListPage.class.php
index 0351b0d3d3..3532432e35 100644
--- a/wcfsetup/install/files/lib/acp/page/TemplateListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/TemplateListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\package\Package;
 use wcf\data\package\PackageCache;
diff --git a/wcfsetup/install/files/lib/acp/page/TrophyCategoryListPage.class.php b/wcfsetup/install/files/lib/acp/page/TrophyCategoryListPage.class.php
index 5fd0b2670b..e2485a725d 100644
--- a/wcfsetup/install/files/lib/acp/page/TrophyCategoryListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/TrophyCategoryListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/acp/page/TrophyListPage.class.php b/wcfsetup/install/files/lib/acp/page/TrophyListPage.class.php
index 9a93bc9434..376733e78e 100644
--- a/wcfsetup/install/files/lib/acp/page/TrophyListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/TrophyListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\trophy\TrophyList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserAuthenticationFailureListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserAuthenticationFailureListPage.class.php
index 87a9b80036..ad8e64e2db 100644
--- a/wcfsetup/install/files/lib/acp/page/UserAuthenticationFailureListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserAuthenticationFailureListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\authentication\failure\UserAuthenticationFailureList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserGroupAssignmentListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserGroupAssignmentListPage.class.php
index 9e251e26ca..e5115b1fa5 100644
--- a/wcfsetup/install/files/lib/acp/page/UserGroupAssignmentListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserGroupAssignmentListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\group\assignment\UserGroupAssignmentList;
 use wcf\page\MultipleLinkPage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserGroupListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserGroupListPage.class.php
index 9e4e4676de..b6d7730da4 100755
--- a/wcfsetup/install/files/lib/acp/page/UserGroupListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserGroupListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\group\UserGroupList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserListPage.class.php
index 78d5a78129..8c7aec9090 100755
--- a/wcfsetup/install/files/lib/acp/page/UserListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\option\ViewableUserOption;
diff --git a/wcfsetup/install/files/lib/acp/page/UserOptionCategoryListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserOptionCategoryListPage.class.php
index 54c35e53ea..e8af677ec2 100644
--- a/wcfsetup/install/files/lib/acp/page/UserOptionCategoryListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserOptionCategoryListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\option\category\UserOptionCategoryList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserOptionListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserOptionListPage.class.php
index eda68c83ae..b4a951a0b8 100644
--- a/wcfsetup/install/files/lib/acp/page/UserOptionListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserOptionListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\option\UserOptionList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserProfileMenuPage.class.php b/wcfsetup/install/files/lib/acp/page/UserProfileMenuPage.class.php
index 3da1062d17..caf5d35888 100644
--- a/wcfsetup/install/files/lib/acp/page/UserProfileMenuPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserProfileMenuPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\profile\menu\item\UserProfileMenuItemList;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserRankListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserRankListPage.class.php
index ba2c0d5032..81e8f500fd 100644
--- a/wcfsetup/install/files/lib/acp/page/UserRankListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserRankListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\user\rank\UserRankList;
 use wcf\page\SortablePage;
diff --git a/wcfsetup/install/files/lib/acp/page/UserTrophyListPage.class.php b/wcfsetup/install/files/lib/acp/page/UserTrophyListPage.class.php
index e65d32c60b..ce6ab403b8 100644
--- a/wcfsetup/install/files/lib/acp/page/UserTrophyListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/UserTrophyListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\trophy\category\TrophyCategoryCache;
 use wcf\data\trophy\Trophy;
diff --git a/wcfsetup/install/files/lib/acp/page/VersionTrackerListPage.class.php b/wcfsetup/install/files/lib/acp/page/VersionTrackerListPage.class.php
index f805f3b4fd..f5ee25066c 100644
--- a/wcfsetup/install/files/lib/acp/page/VersionTrackerListPage.class.php
+++ b/wcfsetup/install/files/lib/acp/page/VersionTrackerListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\acp\page;
 use wcf\data\language\Language;
 use wcf\data\IVersionTrackerObject;
diff --git a/wcfsetup/install/files/lib/action/AJAXInvokeAction.class.php b/wcfsetup/install/files/lib/action/AJAXInvokeAction.class.php
index df5a569273..f1f81c2eec 100644
--- a/wcfsetup/install/files/lib/action/AJAXInvokeAction.class.php
+++ b/wcfsetup/install/files/lib/action/AJAXInvokeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\AJAXException;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/action/AJAXProxyAction.class.php b/wcfsetup/install/files/lib/action/AJAXProxyAction.class.php
index b7e6edfe3f..f270abb4d9 100644
--- a/wcfsetup/install/files/lib/action/AJAXProxyAction.class.php
+++ b/wcfsetup/install/files/lib/action/AJAXProxyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\IDatabaseObjectAction;
 use wcf\system\exception\ImplementationException;
diff --git a/wcfsetup/install/files/lib/action/AJAXUploadAction.class.php b/wcfsetup/install/files/lib/action/AJAXUploadAction.class.php
index 58aa5708d6..7fb69624be 100644
--- a/wcfsetup/install/files/lib/action/AJAXUploadAction.class.php
+++ b/wcfsetup/install/files/lib/action/AJAXUploadAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\upload\UploadHandler;
 use wcf\util\JSON;
diff --git a/wcfsetup/install/files/lib/action/AbstractAction.class.php b/wcfsetup/install/files/lib/action/AbstractAction.class.php
index 8b5bcb2a8a..0bbc73d750 100644
--- a/wcfsetup/install/files/lib/action/AbstractAction.class.php
+++ b/wcfsetup/install/files/lib/action/AbstractAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\event\EventHandler;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/action/AbstractAjaxAction.class.php b/wcfsetup/install/files/lib/action/AbstractAjaxAction.class.php
index 529466fbb2..18de466fcb 100644
--- a/wcfsetup/install/files/lib/action/AbstractAjaxAction.class.php
+++ b/wcfsetup/install/files/lib/action/AbstractAjaxAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\util\JSON;
 
diff --git a/wcfsetup/install/files/lib/action/AbstractDialogAction.class.php b/wcfsetup/install/files/lib/action/AbstractDialogAction.class.php
index 964c84a99e..a25df3f151 100644
--- a/wcfsetup/install/files/lib/action/AbstractDialogAction.class.php
+++ b/wcfsetup/install/files/lib/action/AbstractDialogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\AJAXException;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/action/AbstractSecureAction.class.php b/wcfsetup/install/files/lib/action/AbstractSecureAction.class.php
index dd9c2ba034..66d03075b7 100644
--- a/wcfsetup/install/files/lib/action/AbstractSecureAction.class.php
+++ b/wcfsetup/install/files/lib/action/AbstractSecureAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\InvalidSecurityTokenException;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/action/BackgroundQueuePerformAction.class.php b/wcfsetup/install/files/lib/action/BackgroundQueuePerformAction.class.php
index 08cc882a13..504057debe 100644
--- a/wcfsetup/install/files/lib/action/BackgroundQueuePerformAction.class.php
+++ b/wcfsetup/install/files/lib/action/BackgroundQueuePerformAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\background\BackgroundQueueHandler;
 
diff --git a/wcfsetup/install/files/lib/action/CoreRewriteTestAction.class.php b/wcfsetup/install/files/lib/action/CoreRewriteTestAction.class.php
index 6f43873294..77a79b4b97 100644
--- a/wcfsetup/install/files/lib/action/CoreRewriteTestAction.class.php
+++ b/wcfsetup/install/files/lib/action/CoreRewriteTestAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\IllegalLinkException;
 use wcf\util\CryptoUtil;
diff --git a/wcfsetup/install/files/lib/action/FacebookAuthAction.class.php b/wcfsetup/install/files/lib/action/FacebookAuthAction.class.php
index 6c31b6350a..711163a077 100644
--- a/wcfsetup/install/files/lib/action/FacebookAuthAction.class.php
+++ b/wcfsetup/install/files/lib/action/FacebookAuthAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\user\User;
 use wcf\data\user\UserEditor;
diff --git a/wcfsetup/install/files/lib/action/GithubAuthAction.class.php b/wcfsetup/install/files/lib/action/GithubAuthAction.class.php
index e1a59d31a5..7d56678ef9 100644
--- a/wcfsetup/install/files/lib/action/GithubAuthAction.class.php
+++ b/wcfsetup/install/files/lib/action/GithubAuthAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\user\User;
 use wcf\data\user\UserEditor;
diff --git a/wcfsetup/install/files/lib/action/GoogleAuthAction.class.php b/wcfsetup/install/files/lib/action/GoogleAuthAction.class.php
index 0169d35fbf..c81bc6a5c9 100644
--- a/wcfsetup/install/files/lib/action/GoogleAuthAction.class.php
+++ b/wcfsetup/install/files/lib/action/GoogleAuthAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\user\User;
 use wcf\data\user\UserEditor;
diff --git a/wcfsetup/install/files/lib/action/GravatarDownloadAction.class.php b/wcfsetup/install/files/lib/action/GravatarDownloadAction.class.php
index 6850b25324..fc4bdccd00 100644
--- a/wcfsetup/install/files/lib/action/GravatarDownloadAction.class.php
+++ b/wcfsetup/install/files/lib/action/GravatarDownloadAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\user\avatar\Gravatar;
 use wcf\data\user\avatar\UserAvatar;
diff --git a/wcfsetup/install/files/lib/action/IAction.class.php b/wcfsetup/install/files/lib/action/IAction.class.php
index df4fc51578..980a19d283 100644
--- a/wcfsetup/install/files/lib/action/IAction.class.php
+++ b/wcfsetup/install/files/lib/action/IAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 
 /**
diff --git a/wcfsetup/install/files/lib/action/ImageProxyAction.class.php b/wcfsetup/install/files/lib/action/ImageProxyAction.class.php
index 6775b71129..282bbe72df 100644
--- a/wcfsetup/install/files/lib/action/ImageProxyAction.class.php
+++ b/wcfsetup/install/files/lib/action/ImageProxyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\IllegalLinkException;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/action/LogoutAction.class.php b/wcfsetup/install/files/lib/action/LogoutAction.class.php
index ca43d02fe7..8dc860fdc3 100644
--- a/wcfsetup/install/files/lib/action/LogoutAction.class.php
+++ b/wcfsetup/install/files/lib/action/LogoutAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\request\LinkHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/action/MessageQuoteAction.class.php b/wcfsetup/install/files/lib/action/MessageQuoteAction.class.php
index c2b0356a5f..14c33b874d 100644
--- a/wcfsetup/install/files/lib/action/MessageQuoteAction.class.php
+++ b/wcfsetup/install/files/lib/action/MessageQuoteAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\SystemException;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/action/NotificationConfirmAction.class.php b/wcfsetup/install/files/lib/action/NotificationConfirmAction.class.php
index 073c430981..2db881d268 100644
--- a/wcfsetup/install/files/lib/action/NotificationConfirmAction.class.php
+++ b/wcfsetup/install/files/lib/action/NotificationConfirmAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\notification\event\UserNotificationEvent;
diff --git a/wcfsetup/install/files/lib/action/NotificationDisableAction.class.php b/wcfsetup/install/files/lib/action/NotificationDisableAction.class.php
index 4d72363e16..d42bdaec06 100644
--- a/wcfsetup/install/files/lib/action/NotificationDisableAction.class.php
+++ b/wcfsetup/install/files/lib/action/NotificationDisableAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\user\notification\event\UserNotificationEvent;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/action/PaypalCallbackAction.class.php b/wcfsetup/install/files/lib/action/PaypalCallbackAction.class.php
index 0fb8bd6442..18ac5e4fc9 100644
--- a/wcfsetup/install/files/lib/action/PaypalCallbackAction.class.php
+++ b/wcfsetup/install/files/lib/action/PaypalCallbackAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/action/PollAction.class.php b/wcfsetup/install/files/lib/action/PollAction.class.php
index 218b746ca0..431a22c330 100644
--- a/wcfsetup/install/files/lib/action/PollAction.class.php
+++ b/wcfsetup/install/files/lib/action/PollAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\system\exception\IllegalLinkException;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/action/TwitterAuthAction.class.php b/wcfsetup/install/files/lib/action/TwitterAuthAction.class.php
index 171ab1575a..f6e891ad18 100644
--- a/wcfsetup/install/files/lib/action/TwitterAuthAction.class.php
+++ b/wcfsetup/install/files/lib/action/TwitterAuthAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\action;
 use wcf\data\user\User;
 use wcf\data\user\UserEditor;
diff --git a/wcfsetup/install/files/lib/data/AbstractDatabaseObjectAction.class.php b/wcfsetup/install/files/lib/data/AbstractDatabaseObjectAction.class.php
index 77c5be4e08..460dcc4a36 100644
--- a/wcfsetup/install/files/lib/data/AbstractDatabaseObjectAction.class.php
+++ b/wcfsetup/install/files/lib/data/AbstractDatabaseObjectAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\event\EventHandler;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/data/DatabaseObject.class.php b/wcfsetup/install/files/lib/data/DatabaseObject.class.php
index d073c2ed8e..3586ade750 100644
--- a/wcfsetup/install/files/lib/data/DatabaseObject.class.php
+++ b/wcfsetup/install/files/lib/data/DatabaseObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/data/DatabaseObjectDecorator.class.php b/wcfsetup/install/files/lib/data/DatabaseObjectDecorator.class.php
index fcf628597c..ea82fa66ec 100644
--- a/wcfsetup/install/files/lib/data/DatabaseObjectDecorator.class.php
+++ b/wcfsetup/install/files/lib/data/DatabaseObjectDecorator.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/data/DatabaseObjectEditor.class.php b/wcfsetup/install/files/lib/data/DatabaseObjectEditor.class.php
index bfd6b6f2c2..e9c98e9e2b 100644
--- a/wcfsetup/install/files/lib/data/DatabaseObjectEditor.class.php
+++ b/wcfsetup/install/files/lib/data/DatabaseObjectEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/data/DatabaseObjectList.class.php b/wcfsetup/install/files/lib/data/DatabaseObjectList.class.php
index 34e1e0df16..6fdb102b17 100644
--- a/wcfsetup/install/files/lib/data/DatabaseObjectList.class.php
+++ b/wcfsetup/install/files/lib/data/DatabaseObjectList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/data/I18nDatabaseObjectList.class.php b/wcfsetup/install/files/lib/data/I18nDatabaseObjectList.class.php
index a75f92802c..03d342f4cd 100644
--- a/wcfsetup/install/files/lib/data/I18nDatabaseObjectList.class.php
+++ b/wcfsetup/install/files/lib/data/I18nDatabaseObjectList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/data/IAccessibleObject.class.php b/wcfsetup/install/files/lib/data/IAccessibleObject.class.php
index 3929dd1fa1..8d4210e930 100644
--- a/wcfsetup/install/files/lib/data/IAccessibleObject.class.php
+++ b/wcfsetup/install/files/lib/data/IAccessibleObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\data\user\User;
 
diff --git a/wcfsetup/install/files/lib/data/IAttachmentMessageQuickReplyAction.class.php b/wcfsetup/install/files/lib/data/IAttachmentMessageQuickReplyAction.class.php
index 7a993c27cc..75e3505605 100644
--- a/wcfsetup/install/files/lib/data/IAttachmentMessageQuickReplyAction.class.php
+++ b/wcfsetup/install/files/lib/data/IAttachmentMessageQuickReplyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ICategorizedObject.class.php b/wcfsetup/install/files/lib/data/ICategorizedObject.class.php
index 2d1ccba856..f932344c7b 100644
--- a/wcfsetup/install/files/lib/data/ICategorizedObject.class.php
+++ b/wcfsetup/install/files/lib/data/ICategorizedObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IClipboardAction.class.php b/wcfsetup/install/files/lib/data/IClipboardAction.class.php
index 9852d89ab3..5ce025a073 100644
--- a/wcfsetup/install/files/lib/data/IClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/data/IClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IDatabaseObjectAction.class.php b/wcfsetup/install/files/lib/data/IDatabaseObjectAction.class.php
index 8bcbf130e5..577653a288 100644
--- a/wcfsetup/install/files/lib/data/IDatabaseObjectAction.class.php
+++ b/wcfsetup/install/files/lib/data/IDatabaseObjectAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IDatabaseObjectProcessor.class.php b/wcfsetup/install/files/lib/data/IDatabaseObjectProcessor.class.php
index d6da113340..401ba2edb0 100644
--- a/wcfsetup/install/files/lib/data/IDatabaseObjectProcessor.class.php
+++ b/wcfsetup/install/files/lib/data/IDatabaseObjectProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IDeleteAction.class.php b/wcfsetup/install/files/lib/data/IDeleteAction.class.php
index 962c051d35..b8704a3c4d 100644
--- a/wcfsetup/install/files/lib/data/IDeleteAction.class.php
+++ b/wcfsetup/install/files/lib/data/IDeleteAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IEditableCachedObject.class.php b/wcfsetup/install/files/lib/data/IEditableCachedObject.class.php
index 694242e577..22db762877 100644
--- a/wcfsetup/install/files/lib/data/IEditableCachedObject.class.php
+++ b/wcfsetup/install/files/lib/data/IEditableCachedObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IEditableObject.class.php b/wcfsetup/install/files/lib/data/IEditableObject.class.php
index 2646cd16ed..2c199bd20a 100644
--- a/wcfsetup/install/files/lib/data/IEditableObject.class.php
+++ b/wcfsetup/install/files/lib/data/IEditableObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IExtendedMessageQuickReplyAction.class.php b/wcfsetup/install/files/lib/data/IExtendedMessageQuickReplyAction.class.php
index 2d9fd51835..9d01284683 100644
--- a/wcfsetup/install/files/lib/data/IExtendedMessageQuickReplyAction.class.php
+++ b/wcfsetup/install/files/lib/data/IExtendedMessageQuickReplyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IFeedEntry.class.php b/wcfsetup/install/files/lib/data/IFeedEntry.class.php
index 78daa57979..ce2a0bccbd 100644
--- a/wcfsetup/install/files/lib/data/IFeedEntry.class.php
+++ b/wcfsetup/install/files/lib/data/IFeedEntry.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IFeedEntryWithEnclosure.class.php b/wcfsetup/install/files/lib/data/IFeedEntryWithEnclosure.class.php
index 62ef90858b..6034909f7c 100644
--- a/wcfsetup/install/files/lib/data/IFeedEntryWithEnclosure.class.php
+++ b/wcfsetup/install/files/lib/data/IFeedEntryWithEnclosure.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\feed\enclosure\FeedEnclosure;
 
diff --git a/wcfsetup/install/files/lib/data/IFile.class.php b/wcfsetup/install/files/lib/data/IFile.class.php
index 5d49da7dd5..df4ea7b6fb 100644
--- a/wcfsetup/install/files/lib/data/IFile.class.php
+++ b/wcfsetup/install/files/lib/data/IFile.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IGroupedUserListAction.class.php b/wcfsetup/install/files/lib/data/IGroupedUserListAction.class.php
index 7f70ff849c..c74a831fe2 100644
--- a/wcfsetup/install/files/lib/data/IGroupedUserListAction.class.php
+++ b/wcfsetup/install/files/lib/data/IGroupedUserListAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IImageViewerAction.class.php b/wcfsetup/install/files/lib/data/IImageViewerAction.class.php
index 681ed0d243..68e38606c8 100644
--- a/wcfsetup/install/files/lib/data/IImageViewerAction.class.php
+++ b/wcfsetup/install/files/lib/data/IImageViewerAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ILinkableObject.class.php b/wcfsetup/install/files/lib/data/ILinkableObject.class.php
index 3769b516a5..c76047d0ff 100644
--- a/wcfsetup/install/files/lib/data/ILinkableObject.class.php
+++ b/wcfsetup/install/files/lib/data/ILinkableObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ILoadableContainerAction.class.php b/wcfsetup/install/files/lib/data/ILoadableContainerAction.class.php
index 2651b5e1ed..b0afae9eda 100644
--- a/wcfsetup/install/files/lib/data/ILoadableContainerAction.class.php
+++ b/wcfsetup/install/files/lib/data/ILoadableContainerAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IMessage.class.php b/wcfsetup/install/files/lib/data/IMessage.class.php
index 2a13375177..eaaa381d08 100644
--- a/wcfsetup/install/files/lib/data/IMessage.class.php
+++ b/wcfsetup/install/files/lib/data/IMessage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IMessageInlineEditorAction.class.php b/wcfsetup/install/files/lib/data/IMessageInlineEditorAction.class.php
index ea00291495..d9e55864ba 100644
--- a/wcfsetup/install/files/lib/data/IMessageInlineEditorAction.class.php
+++ b/wcfsetup/install/files/lib/data/IMessageInlineEditorAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IMessageQuickReplyAction.class.php b/wcfsetup/install/files/lib/data/IMessageQuickReplyAction.class.php
index 3468499b57..9fb30d048c 100644
--- a/wcfsetup/install/files/lib/data/IMessageQuickReplyAction.class.php
+++ b/wcfsetup/install/files/lib/data/IMessageQuickReplyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\html\input\HtmlInputProcessor;
 
diff --git a/wcfsetup/install/files/lib/data/IMessageQuoteAction.class.php b/wcfsetup/install/files/lib/data/IMessageQuoteAction.class.php
index 26552c124c..b657fa5d38 100644
--- a/wcfsetup/install/files/lib/data/IMessageQuoteAction.class.php
+++ b/wcfsetup/install/files/lib/data/IMessageQuoteAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IPermissionObject.class.php b/wcfsetup/install/files/lib/data/IPermissionObject.class.php
index 082df2d6d2..0658e1dc9b 100644
--- a/wcfsetup/install/files/lib/data/IPermissionObject.class.php
+++ b/wcfsetup/install/files/lib/data/IPermissionObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\exception\PermissionDeniedException;
 
diff --git a/wcfsetup/install/files/lib/data/IPollObject.class.php b/wcfsetup/install/files/lib/data/IPollObject.class.php
index 7c307d0b0e..ec5211ec55 100644
--- a/wcfsetup/install/files/lib/data/IPollObject.class.php
+++ b/wcfsetup/install/files/lib/data/IPollObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ISearchAction.class.php b/wcfsetup/install/files/lib/data/ISearchAction.class.php
index 15a0c4b2d1..a8e2a2fcf5 100644
--- a/wcfsetup/install/files/lib/data/ISearchAction.class.php
+++ b/wcfsetup/install/files/lib/data/ISearchAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ISortableAction.class.php b/wcfsetup/install/files/lib/data/ISortableAction.class.php
index 9096408e64..1a440a88de 100644
--- a/wcfsetup/install/files/lib/data/ISortableAction.class.php
+++ b/wcfsetup/install/files/lib/data/ISortableAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IStorableObject.class.php b/wcfsetup/install/files/lib/data/IStorableObject.class.php
index 2298dcd573..846e4c0dbb 100644
--- a/wcfsetup/install/files/lib/data/IStorableObject.class.php
+++ b/wcfsetup/install/files/lib/data/IStorableObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IThumbnailFile.class.php b/wcfsetup/install/files/lib/data/IThumbnailFile.class.php
index ef32a524e6..53b02810e2 100644
--- a/wcfsetup/install/files/lib/data/IThumbnailFile.class.php
+++ b/wcfsetup/install/files/lib/data/IThumbnailFile.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ITitledLinkObject.class.php b/wcfsetup/install/files/lib/data/ITitledLinkObject.class.php
index 8037137002..0dd6afcb4e 100644
--- a/wcfsetup/install/files/lib/data/ITitledLinkObject.class.php
+++ b/wcfsetup/install/files/lib/data/ITitledLinkObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ITitledObject.class.php b/wcfsetup/install/files/lib/data/ITitledObject.class.php
index f5221a611f..3c90727c09 100644
--- a/wcfsetup/install/files/lib/data/ITitledObject.class.php
+++ b/wcfsetup/install/files/lib/data/ITitledObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IToggleAction.class.php b/wcfsetup/install/files/lib/data/IToggleAction.class.php
index ee6e96b4c4..8521c5abc1 100644
--- a/wcfsetup/install/files/lib/data/IToggleAction.class.php
+++ b/wcfsetup/install/files/lib/data/IToggleAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IToggleContainerAction.class.php b/wcfsetup/install/files/lib/data/IToggleContainerAction.class.php
index 26dc39937a..e8456ee3e7 100644
--- a/wcfsetup/install/files/lib/data/IToggleContainerAction.class.php
+++ b/wcfsetup/install/files/lib/data/IToggleContainerAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ITraversableObject.class.php b/wcfsetup/install/files/lib/data/ITraversableObject.class.php
index 4ea0cec102..4fb79d88aa 100644
--- a/wcfsetup/install/files/lib/data/ITraversableObject.class.php
+++ b/wcfsetup/install/files/lib/data/ITraversableObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IUploadAction.class.php b/wcfsetup/install/files/lib/data/IUploadAction.class.php
index 987771497e..0dfafe89b0 100644
--- a/wcfsetup/install/files/lib/data/IUploadAction.class.php
+++ b/wcfsetup/install/files/lib/data/IUploadAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IUserContent.class.php b/wcfsetup/install/files/lib/data/IUserContent.class.php
index dc12972ea9..369c1a02ea 100644
--- a/wcfsetup/install/files/lib/data/IUserContent.class.php
+++ b/wcfsetup/install/files/lib/data/IUserContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IVersionTrackerObject.class.php b/wcfsetup/install/files/lib/data/IVersionTrackerObject.class.php
index 87b34fa9d4..b8895b5c10 100644
--- a/wcfsetup/install/files/lib/data/IVersionTrackerObject.class.php
+++ b/wcfsetup/install/files/lib/data/IVersionTrackerObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/IVisitableObjectAction.class.php b/wcfsetup/install/files/lib/data/IVisitableObjectAction.class.php
index 27efa44d3c..cda32bfe5a 100644
--- a/wcfsetup/install/files/lib/data/IVisitableObjectAction.class.php
+++ b/wcfsetup/install/files/lib/data/IVisitableObjectAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/ProcessibleDatabaseObject.class.php b/wcfsetup/install/files/lib/data/ProcessibleDatabaseObject.class.php
index 227aa3e346..43e3aa182d 100644
--- a/wcfsetup/install/files/lib/data/ProcessibleDatabaseObject.class.php
+++ b/wcfsetup/install/files/lib/data/ProcessibleDatabaseObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\exception\ImplementationException;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/data/TDatabaseObjectOptions.class.php b/wcfsetup/install/files/lib/data/TDatabaseObjectOptions.class.php
index 95939950c4..1f11953fff 100644
--- a/wcfsetup/install/files/lib/data/TDatabaseObjectOptions.class.php
+++ b/wcfsetup/install/files/lib/data/TDatabaseObjectOptions.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/TDatabaseObjectPermissions.class.php b/wcfsetup/install/files/lib/data/TDatabaseObjectPermissions.class.php
index 5c77226dd6..6b4f8af9f3 100644
--- a/wcfsetup/install/files/lib/data/TDatabaseObjectPermissions.class.php
+++ b/wcfsetup/install/files/lib/data/TDatabaseObjectPermissions.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/data/TLegacyUserPropertyAccess.class.php b/wcfsetup/install/files/lib/data/TLegacyUserPropertyAccess.class.php
index bd1b0def22..7ab29a6ef9 100644
--- a/wcfsetup/install/files/lib/data/TLegacyUserPropertyAccess.class.php
+++ b/wcfsetup/install/files/lib/data/TLegacyUserPropertyAccess.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/TMessageQuickReplyGuestDialogAction.class.php b/wcfsetup/install/files/lib/data/TMessageQuickReplyGuestDialogAction.class.php
index dab31776ac..590372a9a1 100644
--- a/wcfsetup/install/files/lib/data/TMessageQuickReplyGuestDialogAction.class.php
+++ b/wcfsetup/install/files/lib/data/TMessageQuickReplyGuestDialogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\data\object\type\ObjectType;
 use wcf\system\captcha\CaptchaHandler;
diff --git a/wcfsetup/install/files/lib/data/TMultiCategoryObject.class.php b/wcfsetup/install/files/lib/data/TMultiCategoryObject.class.php
index 6e1b1d7b8c..ba89bf7628 100644
--- a/wcfsetup/install/files/lib/data/TMultiCategoryObject.class.php
+++ b/wcfsetup/install/files/lib/data/TMultiCategoryObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\system\exception\ParentClassException;
diff --git a/wcfsetup/install/files/lib/data/TUserContent.class.php b/wcfsetup/install/files/lib/data/TUserContent.class.php
index 1f0b22fa3a..84df8297bf 100644
--- a/wcfsetup/install/files/lib/data/TUserContent.class.php
+++ b/wcfsetup/install/files/lib/data/TUserContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/acl/option/ACLOption.class.php b/wcfsetup/install/files/lib/data/acl/option/ACLOption.class.php
index 43c10a479b..2eb4db7adb 100644
--- a/wcfsetup/install/files/lib/data/acl/option/ACLOption.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/ACLOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/acl/option/ACLOptionAction.class.php b/wcfsetup/install/files/lib/data/acl/option/ACLOptionAction.class.php
index ca67a99547..b78afb372e 100644
--- a/wcfsetup/install/files/lib/data/acl/option/ACLOptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/ACLOptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\acl\ACLHandler;
diff --git a/wcfsetup/install/files/lib/data/acl/option/ACLOptionEditor.class.php b/wcfsetup/install/files/lib/data/acl/option/ACLOptionEditor.class.php
index 4cb8e6db56..c2759466bb 100644
--- a/wcfsetup/install/files/lib/data/acl/option/ACLOptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/ACLOptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acl/option/ACLOptionList.class.php b/wcfsetup/install/files/lib/data/acl/option/ACLOptionList.class.php
index 7f1723b0ba..d28f488973 100644
--- a/wcfsetup/install/files/lib/data/acl/option/ACLOptionList.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/ACLOptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategory.class.php b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategory.class.php
index 5debaf6120..aaa7447fc1 100644
--- a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategory.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option\category;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryAction.class.php b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryAction.class.php
index 70ace7784f..45f0fa69ce 100644
--- a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option\category;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryEditor.class.php b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryEditor.class.php
index 03635737a3..1eb0199a30 100644
--- a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option\category;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryList.class.php b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryList.class.php
index e68bd8f15b..f6f0f1c415 100644
--- a/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryList.class.php
+++ b/wcfsetup/install/files/lib/data/acl/option/category/ACLOptionCategoryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acl\option\category;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItem.class.php b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItem.class.php
index 490b699057..b340cc7600 100644
--- a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItem.class.php
+++ b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\menu\item;
 use wcf\data\DatabaseObject;
 use wcf\system\menu\ITreeMenuItem;
diff --git a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemAction.class.php b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemAction.class.php
index c9413157cc..839a12a60b 100644
--- a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\menu\item;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemEditor.class.php b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemEditor.class.php
index 8bc27dc8b8..a2d261d3b7 100644
--- a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\menu\item;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemList.class.php b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemList.class.php
index 05164cdc10..6785b16603 100644
--- a/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/menu/item/ACPMenuItemList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\menu\item;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProvider.class.php b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProvider.class.php
index 04681eb411..9150c31185 100644
--- a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProvider.class.php
+++ b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\search\provider;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderAction.class.php b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderAction.class.php
index 5c972d131a..ca9ce4d1b0 100644
--- a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\search\provider;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISearchAction;
diff --git a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderEditor.class.php b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderEditor.class.php
index 6723835ece..c780251d79 100644
--- a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\search\provider;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderList.class.php b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderList.class.php
index 3bbaf1b9cc..38f14d7aab 100644
--- a/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/search/provider/ACPSearchProviderList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\search\provider;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/ACPSession.class.php b/wcfsetup/install/files/lib/data/acp/session/ACPSession.class.php
index 793783ede6..476fb2aa8e 100644
--- a/wcfsetup/install/files/lib/data/acp/session/ACPSession.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/ACPSession.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/acp/session/ACPSessionAction.class.php b/wcfsetup/install/files/lib/data/acp/session/ACPSessionAction.class.php
index 0b3d5cc6a3..d48efb9dbb 100644
--- a/wcfsetup/install/files/lib/data/acp/session/ACPSessionAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/ACPSessionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/ACPSessionEditor.class.php b/wcfsetup/install/files/lib/data/acp/session/ACPSessionEditor.class.php
index 376e27f205..8ce7866f92 100644
--- a/wcfsetup/install/files/lib/data/acp/session/ACPSessionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/ACPSessionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/data/acp/session/ACPSessionList.class.php b/wcfsetup/install/files/lib/data/acp/session/ACPSessionList.class.php
index a4aaa8cdf9..0212e33474 100644
--- a/wcfsetup/install/files/lib/data/acp/session/ACPSessionList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/ACPSessionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLog.class.php b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLog.class.php
index 215f4c63c5..4910179ee4 100644
--- a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLog.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLog.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\access\log;
 use wcf\data\DatabaseObject;
 use wcf\util\UserUtil;
diff --git a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogAction.class.php b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogAction.class.php
index c92d3c309c..61e477fc9b 100644
--- a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\access\log;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogEditor.class.php b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogEditor.class.php
index 9f1174a68b..e9c9f64fd4 100644
--- a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\access\log;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogList.class.php b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogList.class.php
index afb1182fbe..d4f8dfcb21 100644
--- a/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/access/log/ACPSessionAccessLogList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\access\log;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLog.class.php b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLog.class.php
index 2658f5d3f9..b7c7b4d1d6 100644
--- a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLog.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLog.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\log;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogAction.class.php b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogAction.class.php
index 752542787b..38f7f2fdb6 100644
--- a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\log;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogEditor.class.php b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogEditor.class.php
index 9a946f45a1..1e9871e168 100644
--- a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\log;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogList.class.php b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogList.class.php
index 51270db49e..a084d66924 100644
--- a/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/log/ACPSessionLogList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\log;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtual.class.php b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtual.class.php
index c57eb3ce00..382a98ff67 100644
--- a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtual.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtual.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\virtual;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualAction.class.php b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualAction.class.php
index 70cdb11378..7ab12de1a3 100644
--- a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\virtual;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\util\UserUtil;
diff --git a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualEditor.class.php b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualEditor.class.php
index b753af3c97..b0633ae61b 100644
--- a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\virtual;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualList.class.php b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualList.class.php
index a4332f6c11..777ee036c2 100644
--- a/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/session/virtual/ACPSessionVirtualList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\session\virtual;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/acp/template/ACPTemplate.class.php b/wcfsetup/install/files/lib/data/acp/template/ACPTemplate.class.php
index de99e358eb..054762b482 100644
--- a/wcfsetup/install/files/lib/data/acp/template/ACPTemplate.class.php
+++ b/wcfsetup/install/files/lib/data/acp/template/ACPTemplate.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\template;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/acp/template/ACPTemplateAction.class.php b/wcfsetup/install/files/lib/data/acp/template/ACPTemplateAction.class.php
index b80d9cf278..7616eb5c1e 100644
--- a/wcfsetup/install/files/lib/data/acp/template/ACPTemplateAction.class.php
+++ b/wcfsetup/install/files/lib/data/acp/template/ACPTemplateAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\template;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/acp/template/ACPTemplateEditor.class.php b/wcfsetup/install/files/lib/data/acp/template/ACPTemplateEditor.class.php
index 0e94159232..2e5fbb48dd 100644
--- a/wcfsetup/install/files/lib/data/acp/template/ACPTemplateEditor.class.php
+++ b/wcfsetup/install/files/lib/data/acp/template/ACPTemplateEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\template;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/acp/template/ACPTemplateList.class.php b/wcfsetup/install/files/lib/data/acp/template/ACPTemplateList.class.php
index 2cde8df30a..26392925f3 100644
--- a/wcfsetup/install/files/lib/data/acp/template/ACPTemplateList.class.php
+++ b/wcfsetup/install/files/lib/data/acp/template/ACPTemplateList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\acp\template;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/ad/Ad.class.php b/wcfsetup/install/files/lib/data/ad/Ad.class.php
index 924ecc472a..a14d41e73e 100644
--- a/wcfsetup/install/files/lib/data/ad/Ad.class.php
+++ b/wcfsetup/install/files/lib/data/ad/Ad.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\ad;
 use wcf\data\condition\Condition;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/data/ad/AdAction.class.php b/wcfsetup/install/files/lib/data/ad/AdAction.class.php
index 201537dd7f..3682b8f00d 100644
--- a/wcfsetup/install/files/lib/data/ad/AdAction.class.php
+++ b/wcfsetup/install/files/lib/data/ad/AdAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\ad;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISortableAction;
diff --git a/wcfsetup/install/files/lib/data/ad/AdEditor.class.php b/wcfsetup/install/files/lib/data/ad/AdEditor.class.php
index 6b726c68cd..043fb1c5d6 100644
--- a/wcfsetup/install/files/lib/data/ad/AdEditor.class.php
+++ b/wcfsetup/install/files/lib/data/ad/AdEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\ad;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/ad/AdList.class.php b/wcfsetup/install/files/lib/data/ad/AdList.class.php
index 9f4ff3d4e1..25d55fe6c9 100644
--- a/wcfsetup/install/files/lib/data/ad/AdList.class.php
+++ b/wcfsetup/install/files/lib/data/ad/AdList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\ad;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/application/Application.class.php b/wcfsetup/install/files/lib/data/application/Application.class.php
index e972c4dce6..3ce2d51f9f 100644
--- a/wcfsetup/install/files/lib/data/application/Application.class.php
+++ b/wcfsetup/install/files/lib/data/application/Application.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\application;
 use wcf\data\package\Package;
 use wcf\data\package\PackageCache;
diff --git a/wcfsetup/install/files/lib/data/application/ApplicationAction.class.php b/wcfsetup/install/files/lib/data/application/ApplicationAction.class.php
index 77e2b5312d..d09f702d44 100644
--- a/wcfsetup/install/files/lib/data/application/ApplicationAction.class.php
+++ b/wcfsetup/install/files/lib/data/application/ApplicationAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\application;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\cache\builder\ApplicationCacheBuilder;
diff --git a/wcfsetup/install/files/lib/data/application/ApplicationEditor.class.php b/wcfsetup/install/files/lib/data/application/ApplicationEditor.class.php
index e6b21d8a4f..208c47316f 100644
--- a/wcfsetup/install/files/lib/data/application/ApplicationEditor.class.php
+++ b/wcfsetup/install/files/lib/data/application/ApplicationEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\application;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/application/ApplicationList.class.php b/wcfsetup/install/files/lib/data/application/ApplicationList.class.php
index b3dc16faac..4418ee0feb 100644
--- a/wcfsetup/install/files/lib/data/application/ApplicationList.class.php
+++ b/wcfsetup/install/files/lib/data/application/ApplicationList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\application;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/application/ViewableApplication.class.php b/wcfsetup/install/files/lib/data/application/ViewableApplication.class.php
index 9aaa61e897..a09fda8e37 100644
--- a/wcfsetup/install/files/lib/data/application/ViewableApplication.class.php
+++ b/wcfsetup/install/files/lib/data/application/ViewableApplication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\application;
 use wcf\data\package\Package;
 use wcf\data\package\PackageCache;
diff --git a/wcfsetup/install/files/lib/data/application/ViewableApplicationList.class.php b/wcfsetup/install/files/lib/data/application/ViewableApplicationList.class.php
index e5f3fcab19..8f52310857 100644
--- a/wcfsetup/install/files/lib/data/application/ViewableApplicationList.class.php
+++ b/wcfsetup/install/files/lib/data/application/ViewableApplicationList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\application;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/article/AccessibleArticleList.class.php b/wcfsetup/install/files/lib/data/article/AccessibleArticleList.class.php
index b5664211d5..e73b43cd8c 100644
--- a/wcfsetup/install/files/lib/data/article/AccessibleArticleList.class.php
+++ b/wcfsetup/install/files/lib/data/article/AccessibleArticleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\category\ArticleCategory;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/article/Article.class.php b/wcfsetup/install/files/lib/data/article/Article.class.php
index 291eac9d3f..a2650d461c 100644
--- a/wcfsetup/install/files/lib/data/article/Article.class.php
+++ b/wcfsetup/install/files/lib/data/article/Article.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\content\ArticleContent;
diff --git a/wcfsetup/install/files/lib/data/article/ArticleAction.class.php b/wcfsetup/install/files/lib/data/article/ArticleAction.class.php
index 4b54c9f373..ead0812600 100644
--- a/wcfsetup/install/files/lib/data/article/ArticleAction.class.php
+++ b/wcfsetup/install/files/lib/data/article/ArticleAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\content\ArticleContent;
diff --git a/wcfsetup/install/files/lib/data/article/ArticleEditor.class.php b/wcfsetup/install/files/lib/data/article/ArticleEditor.class.php
index 1c3dd415c0..71243e7c33 100644
--- a/wcfsetup/install/files/lib/data/article/ArticleEditor.class.php
+++ b/wcfsetup/install/files/lib/data/article/ArticleEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/article/ArticleList.class.php b/wcfsetup/install/files/lib/data/article/ArticleList.class.php
index a4165acc5f..90ee55d028 100644
--- a/wcfsetup/install/files/lib/data/article/ArticleList.class.php
+++ b/wcfsetup/install/files/lib/data/article/ArticleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/article/ArticleVersionTracker.class.php b/wcfsetup/install/files/lib/data/article/ArticleVersionTracker.class.php
index 9deb0596cd..0211613136 100644
--- a/wcfsetup/install/files/lib/data/article/ArticleVersionTracker.class.php
+++ b/wcfsetup/install/files/lib/data/article/ArticleVersionTracker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\content\ArticleContent;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/article/CategoryArticleList.class.php b/wcfsetup/install/files/lib/data/article/CategoryArticleList.class.php
index 6715e2fcc4..50b1068994 100644
--- a/wcfsetup/install/files/lib/data/article/CategoryArticleList.class.php
+++ b/wcfsetup/install/files/lib/data/article/CategoryArticleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\category\ArticleCategory;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/article/FeedArticle.class.php b/wcfsetup/install/files/lib/data/article/FeedArticle.class.php
index a5e23d3abe..c80d95ec91 100644
--- a/wcfsetup/install/files/lib/data/article/FeedArticle.class.php
+++ b/wcfsetup/install/files/lib/data/article/FeedArticle.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\IFeedEntryWithEnclosure;
 use wcf\data\TUserContent;
diff --git a/wcfsetup/install/files/lib/data/article/FeedArticleList.class.php b/wcfsetup/install/files/lib/data/article/FeedArticleList.class.php
index 1e7eff6df6..7c02f857b0 100644
--- a/wcfsetup/install/files/lib/data/article/FeedArticleList.class.php
+++ b/wcfsetup/install/files/lib/data/article/FeedArticleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/article/LikeableArticle.class.php b/wcfsetup/install/files/lib/data/article/LikeableArticle.class.php
index e4e90b5af0..a53e605983 100644
--- a/wcfsetup/install/files/lib/data/article/LikeableArticle.class.php
+++ b/wcfsetup/install/files/lib/data/article/LikeableArticle.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\like\object\AbstractLikeObject;
 
diff --git a/wcfsetup/install/files/lib/data/article/LikeableArticleProvider.class.php b/wcfsetup/install/files/lib/data/article/LikeableArticleProvider.class.php
index aa65fdb8c7..b77eb4d1e8 100644
--- a/wcfsetup/install/files/lib/data/article/LikeableArticleProvider.class.php
+++ b/wcfsetup/install/files/lib/data/article/LikeableArticleProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\like\object\ILikeObject;
 use wcf\data\like\ILikeObjectTypeProvider;
diff --git a/wcfsetup/install/files/lib/data/article/TaggedArticleList.class.php b/wcfsetup/install/files/lib/data/article/TaggedArticleList.class.php
index ce0804d667..dde615ab4d 100644
--- a/wcfsetup/install/files/lib/data/article/TaggedArticleList.class.php
+++ b/wcfsetup/install/files/lib/data/article/TaggedArticleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\tag\Tag;
 use wcf\system\tagging\TagEngine;
diff --git a/wcfsetup/install/files/lib/data/article/ViewableArticle.class.php b/wcfsetup/install/files/lib/data/article/ViewableArticle.class.php
index eb1a8509de..33c2cc0b8b 100644
--- a/wcfsetup/install/files/lib/data/article/ViewableArticle.class.php
+++ b/wcfsetup/install/files/lib/data/article/ViewableArticle.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\content\ArticleContent;
diff --git a/wcfsetup/install/files/lib/data/article/ViewableArticleList.class.php b/wcfsetup/install/files/lib/data/article/ViewableArticleList.class.php
index 762a9de7d9..2673ee6098 100644
--- a/wcfsetup/install/files/lib/data/article/ViewableArticleList.class.php
+++ b/wcfsetup/install/files/lib/data/article/ViewableArticleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article;
 use wcf\data\article\content\ViewableArticleContentList;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/data/article/category/ArticleCategory.class.php b/wcfsetup/install/files/lib/data/article/category/ArticleCategory.class.php
index 4024fd2a13..2c3d8a0056 100644
--- a/wcfsetup/install/files/lib/data/article/category/ArticleCategory.class.php
+++ b/wcfsetup/install/files/lib/data/article/category/ArticleCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\category;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\data\label\group\ViewableLabelGroup;
diff --git a/wcfsetup/install/files/lib/data/article/category/ArticleCategoryCache.class.php b/wcfsetup/install/files/lib/data/article/category/ArticleCategoryCache.class.php
index afa1606f4f..2d5e25a172 100644
--- a/wcfsetup/install/files/lib/data/article/category/ArticleCategoryCache.class.php
+++ b/wcfsetup/install/files/lib/data/article/category/ArticleCategoryCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\category;
 use wcf\data\article\Article;
 use wcf\data\category\Category;
diff --git a/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNode.class.php b/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNode.class.php
index f5efda34e9..af2f6bb78f 100644
--- a/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNode.class.php
+++ b/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\category;
 use wcf\data\category\CategoryNode;
 
diff --git a/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNodeTree.class.php b/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNodeTree.class.php
index 12e4a750c6..5c54aee38b 100644
--- a/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNodeTree.class.php
+++ b/wcfsetup/install/files/lib/data/article/category/ArticleCategoryNodeTree.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\category;
 use wcf\data\category\CategoryNode;
 use wcf\data\category\CategoryNodeTree;
diff --git a/wcfsetup/install/files/lib/data/article/content/ArticleContent.class.php b/wcfsetup/install/files/lib/data/article/content/ArticleContent.class.php
index b7e267ed89..4391ebaf40 100644
--- a/wcfsetup/install/files/lib/data/article/content/ArticleContent.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/ArticleContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\article\Article;
 use wcf\data\language\Language;
diff --git a/wcfsetup/install/files/lib/data/article/content/ArticleContentAction.class.php b/wcfsetup/install/files/lib/data/article/content/ArticleContentAction.class.php
index f2afd3735b..2d87b1cc4c 100644
--- a/wcfsetup/install/files/lib/data/article/content/ArticleContentAction.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/ArticleContentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\comment\CommentHandler;
diff --git a/wcfsetup/install/files/lib/data/article/content/ArticleContentEditor.class.php b/wcfsetup/install/files/lib/data/article/content/ArticleContentEditor.class.php
index f6f0e712e6..d44d7e7b5a 100644
--- a/wcfsetup/install/files/lib/data/article/content/ArticleContentEditor.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/ArticleContentEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/article/content/ArticleContentList.class.php b/wcfsetup/install/files/lib/data/article/content/ArticleContentList.class.php
index 2963a4193c..87f583f64a 100644
--- a/wcfsetup/install/files/lib/data/article/content/ArticleContentList.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/ArticleContentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContent.class.php b/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContent.class.php
index efa4e2dbdd..f770f5a85b 100644
--- a/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContent.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\search\ISearchResultObject;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContentList.class.php b/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContentList.class.php
index ff903c5174..0b57676313 100644
--- a/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContentList.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/SearchResultArticleContentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/article/content/ViewableArticleContent.class.php b/wcfsetup/install/files/lib/data/article/content/ViewableArticleContent.class.php
index 05dfce0abe..0d5146f285 100644
--- a/wcfsetup/install/files/lib/data/article/content/ViewableArticleContent.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/ViewableArticleContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\article\ViewableArticle;
 use wcf\data\media\ViewableMedia;
diff --git a/wcfsetup/install/files/lib/data/article/content/ViewableArticleContentList.class.php b/wcfsetup/install/files/lib/data/article/content/ViewableArticleContentList.class.php
index 7953360bcc..e644216d41 100644
--- a/wcfsetup/install/files/lib/data/article/content/ViewableArticleContentList.class.php
+++ b/wcfsetup/install/files/lib/data/article/content/ViewableArticleContentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\article\content;
 use wcf\data\media\ViewableMediaList;
 use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
diff --git a/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachment.class.php b/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachment.class.php
index 6567b5ead6..708ea38cbb 100644
--- a/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachment.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachmentList.class.php b/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachmentList.class.php
index 17dd8a0be1..f0c5d9b563 100644
--- a/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachmentList.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/AdministrativeAttachmentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/attachment/Attachment.class.php b/wcfsetup/install/files/lib/data/attachment/Attachment.class.php
index 5a66262c70..4d83d54199 100644
--- a/wcfsetup/install/files/lib/data/attachment/Attachment.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/Attachment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/attachment/AttachmentAction.class.php b/wcfsetup/install/files/lib/data/attachment/AttachmentAction.class.php
index 8cc95e5839..0ed94cef6f 100644
--- a/wcfsetup/install/files/lib/data/attachment/AttachmentAction.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/AttachmentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/attachment/AttachmentEditor.class.php b/wcfsetup/install/files/lib/data/attachment/AttachmentEditor.class.php
index a0750f32b2..9f5f39f03f 100644
--- a/wcfsetup/install/files/lib/data/attachment/AttachmentEditor.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/AttachmentEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/data/attachment/AttachmentList.class.php b/wcfsetup/install/files/lib/data/attachment/AttachmentList.class.php
index 6c92526e4b..30dc991c0e 100644
--- a/wcfsetup/install/files/lib/data/attachment/AttachmentList.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/AttachmentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php b/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php
index 0a6d6fd9c1..d57352976f 100644
--- a/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\attachment;
 use wcf\data\object\type\ObjectTypeCache;
 
diff --git a/wcfsetup/install/files/lib/data/bbcode/BBCode.class.php b/wcfsetup/install/files/lib/data/bbcode/BBCode.class.php
index 90815ad238..8c335d43d3 100644
--- a/wcfsetup/install/files/lib/data/bbcode/BBCode.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/BBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode;
 use wcf\data\bbcode\attribute\BBCodeAttribute;
 use wcf\data\ProcessibleDatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/bbcode/BBCodeAction.class.php b/wcfsetup/install/files/lib/data/bbcode/BBCodeAction.class.php
index 6b5af768e5..a2b5fa1a0e 100644
--- a/wcfsetup/install/files/lib/data/bbcode/BBCodeAction.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/BBCodeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\group\UserGroupEditor;
diff --git a/wcfsetup/install/files/lib/data/bbcode/BBCodeCache.class.php b/wcfsetup/install/files/lib/data/bbcode/BBCodeCache.class.php
index 1ea897b93a..a382ad65ce 100644
--- a/wcfsetup/install/files/lib/data/bbcode/BBCodeCache.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/BBCodeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode;
 use wcf\data\bbcode\attribute\BBCodeAttribute;
 use wcf\system\cache\builder\BBCodeCacheBuilder;
diff --git a/wcfsetup/install/files/lib/data/bbcode/BBCodeEditor.class.php b/wcfsetup/install/files/lib/data/bbcode/BBCodeEditor.class.php
index 84b7645e48..fa4289966c 100644
--- a/wcfsetup/install/files/lib/data/bbcode/BBCodeEditor.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/BBCodeEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/bbcode/BBCodeList.class.php b/wcfsetup/install/files/lib/data/bbcode/BBCodeList.class.php
index 530bc87458..37106b7b57 100644
--- a/wcfsetup/install/files/lib/data/bbcode/BBCodeList.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/BBCodeList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/bbcode/MessagePreviewAction.class.php b/wcfsetup/install/files/lib/data/bbcode/MessagePreviewAction.class.php
index 30d3b52266..3dbd69cc20 100644
--- a/wcfsetup/install/files/lib/data/bbcode/MessagePreviewAction.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/MessagePreviewAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode;
 use wcf\system\bbcode\BBCodeHandler;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttribute.class.php b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttribute.class.php
index 829ee5f06c..226999ea6a 100644
--- a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttribute.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttribute.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\attribute;
 use wcf\data\bbcode\BBCode;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeAction.class.php b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeAction.class.php
index cb59ba0d8a..68bc8097ed 100644
--- a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeAction.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\attribute;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeEditor.class.php b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeEditor.class.php
index 73010db166..6ec40fbcb0 100644
--- a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeEditor.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\attribute;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeList.class.php b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeList.class.php
index c99f0790dd..1a5944be24 100644
--- a/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeList.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/attribute/BBCodeAttributeList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\attribute;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProvider.class.php b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProvider.class.php
index caec8b4756..b643b1784a 100644
--- a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProvider.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\media\provider;
 use wcf\data\DatabaseObject;
 use wcf\system\bbcode\media\provider\IBBCodeMediaProvider;
diff --git a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderAction.class.php b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderAction.class.php
index dae16ed6fb..bebc9d5126 100644
--- a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderAction.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\media\provider;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderEditor.class.php b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderEditor.class.php
index e6064d714e..562344436f 100644
--- a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderEditor.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\media\provider;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderList.class.php b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderList.class.php
index d424445945..eed333104e 100644
--- a/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderList.class.php
+++ b/wcfsetup/install/files/lib/data/bbcode/media/provider/BBCodeMediaProviderList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\bbcode\media\provider;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/box/Box.class.php b/wcfsetup/install/files/lib/data/box/Box.class.php
index 33b79826fb..06cb61b507 100644
--- a/wcfsetup/install/files/lib/data/box/Box.class.php
+++ b/wcfsetup/install/files/lib/data/box/Box.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box;
 use wcf\data\box\content\BoxContent;
 use wcf\data\condition\Condition;
diff --git a/wcfsetup/install/files/lib/data/box/BoxAction.class.php b/wcfsetup/install/files/lib/data/box/BoxAction.class.php
index c8b404ddb3..67a7c0e440 100644
--- a/wcfsetup/install/files/lib/data/box/BoxAction.class.php
+++ b/wcfsetup/install/files/lib/data/box/BoxAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box;
 use wcf\data\box\content\BoxContent;
 use wcf\data\box\content\BoxContentEditor;
diff --git a/wcfsetup/install/files/lib/data/box/BoxEditor.class.php b/wcfsetup/install/files/lib/data/box/BoxEditor.class.php
index 63a77ec54a..bec6d6b9b6 100644
--- a/wcfsetup/install/files/lib/data/box/BoxEditor.class.php
+++ b/wcfsetup/install/files/lib/data/box/BoxEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/box/BoxList.class.php b/wcfsetup/install/files/lib/data/box/BoxList.class.php
index b8df4901ac..6781c452c5 100644
--- a/wcfsetup/install/files/lib/data/box/BoxList.class.php
+++ b/wcfsetup/install/files/lib/data/box/BoxList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box;
 use wcf\data\box\content\BoxContentList;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/data/box/BoxVersionTracker.class.php b/wcfsetup/install/files/lib/data/box/BoxVersionTracker.class.php
index 4c42fa315d..3c6a8e64ca 100644
--- a/wcfsetup/install/files/lib/data/box/BoxVersionTracker.class.php
+++ b/wcfsetup/install/files/lib/data/box/BoxVersionTracker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box;
 use wcf\data\box\content\BoxContent;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/box/content/BoxContent.class.php b/wcfsetup/install/files/lib/data/box/content/BoxContent.class.php
index ab4e814aad..a547978c2f 100644
--- a/wcfsetup/install/files/lib/data/box/content/BoxContent.class.php
+++ b/wcfsetup/install/files/lib/data/box/content/BoxContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box\content;
 use wcf\data\media\ViewableMedia;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/box/content/BoxContentAction.class.php b/wcfsetup/install/files/lib/data/box/content/BoxContentAction.class.php
index 3ca6064645..dedd8b83cc 100644
--- a/wcfsetup/install/files/lib/data/box/content/BoxContentAction.class.php
+++ b/wcfsetup/install/files/lib/data/box/content/BoxContentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box\content;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/box/content/BoxContentEditor.class.php b/wcfsetup/install/files/lib/data/box/content/BoxContentEditor.class.php
index a7cc9f8f0b..f01b2e5e91 100644
--- a/wcfsetup/install/files/lib/data/box/content/BoxContentEditor.class.php
+++ b/wcfsetup/install/files/lib/data/box/content/BoxContentEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box\content;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/box/content/BoxContentList.class.php b/wcfsetup/install/files/lib/data/box/content/BoxContentList.class.php
index 04a114d967..55b3b71d98 100644
--- a/wcfsetup/install/files/lib/data/box/content/BoxContentList.class.php
+++ b/wcfsetup/install/files/lib/data/box/content/BoxContentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\box\content;
 use wcf\data\media\ViewableMediaList;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestion.class.php b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestion.class.php
index d5d0c425f2..687fff20b1 100644
--- a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestion.class.php
+++ b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestion.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\captcha\question;
 use wcf\data\DatabaseObject;
 use wcf\system\Regex;
diff --git a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionAction.class.php b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionAction.class.php
index 4aea471517..ac612dea30 100644
--- a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionAction.class.php
+++ b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\captcha\question;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionEditor.class.php b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionEditor.class.php
index 17e2980a34..0849e14468 100644
--- a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\captcha\question;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionList.class.php b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionList.class.php
index acd5af7ef4..58e8b4f44d 100644
--- a/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionList.class.php
+++ b/wcfsetup/install/files/lib/data/captcha/question/CaptchaQuestionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\captcha\question;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/category/AbstractDecoratedCategory.class.php b/wcfsetup/install/files/lib/data/category/AbstractDecoratedCategory.class.php
index 9bc78ae7f8..e2ccab8179 100644
--- a/wcfsetup/install/files/lib/data/category/AbstractDecoratedCategory.class.php
+++ b/wcfsetup/install/files/lib/data/category/AbstractDecoratedCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\data\DatabaseObjectDecorator;
 use wcf\system\category\CategoryHandler;
diff --git a/wcfsetup/install/files/lib/data/category/Category.class.php b/wcfsetup/install/files/lib/data/category/Category.class.php
index 402a03ff84..7bafbaa2cf 100644
--- a/wcfsetup/install/files/lib/data/category/Category.class.php
+++ b/wcfsetup/install/files/lib/data/category/Category.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\data\object\type\ObjectType;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/category/CategoryAction.class.php b/wcfsetup/install/files/lib/data/category/CategoryAction.class.php
index 815e2bc32c..1c67285529 100644
--- a/wcfsetup/install/files/lib/data/category/CategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/category/CategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\data\language\item\LanguageItemAction;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/category/CategoryEditor.class.php b/wcfsetup/install/files/lib/data/category/CategoryEditor.class.php
index 9e5b7eb4f6..6057a8a5bb 100644
--- a/wcfsetup/install/files/lib/data/category/CategoryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/category/CategoryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/category/CategoryList.class.php b/wcfsetup/install/files/lib/data/category/CategoryList.class.php
index dad1379243..d56bf3a9d0 100644
--- a/wcfsetup/install/files/lib/data/category/CategoryList.class.php
+++ b/wcfsetup/install/files/lib/data/category/CategoryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/category/CategoryNode.class.php b/wcfsetup/install/files/lib/data/category/CategoryNode.class.php
index 264e015664..5f8c719daf 100644
--- a/wcfsetup/install/files/lib/data/category/CategoryNode.class.php
+++ b/wcfsetup/install/files/lib/data/category/CategoryNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\data\DatabaseObjectDecorator;
 
diff --git a/wcfsetup/install/files/lib/data/category/CategoryNodeTree.class.php b/wcfsetup/install/files/lib/data/category/CategoryNodeTree.class.php
index 019bb928d4..f7f753d9e5 100644
--- a/wcfsetup/install/files/lib/data/category/CategoryNodeTree.class.php
+++ b/wcfsetup/install/files/lib/data/category/CategoryNodeTree.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\system\category\CategoryHandler;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/data/category/UncachedCategoryNodeTree.class.php b/wcfsetup/install/files/lib/data/category/UncachedCategoryNodeTree.class.php
index 4ceb4b0f3e..bb6cad292a 100644
--- a/wcfsetup/install/files/lib/data/category/UncachedCategoryNodeTree.class.php
+++ b/wcfsetup/install/files/lib/data/category/UncachedCategoryNodeTree.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\category;
 use wcf\system\category\CategoryHandler;
 
diff --git a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardAction.class.php b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardAction.class.php
index e06fbb7531..78db9a8ceb 100644
--- a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\clipboard\action;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionAction.class.php b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionAction.class.php
index a65f5a7c4a..30e8de7e2a 100644
--- a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionAction.class.php
+++ b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\clipboard\action;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionEditor.class.php b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionEditor.class.php
index 78da0612d8..2a5ee9b8d5 100644
--- a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\clipboard\action;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionList.class.php b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionList.class.php
index 3881808050..ca09f7976a 100644
--- a/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionList.class.php
+++ b/wcfsetup/install/files/lib/data/clipboard/action/ClipboardActionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\clipboard\action;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/clipboard/item/ClipboardItemAction.class.php b/wcfsetup/install/files/lib/data/clipboard/item/ClipboardItemAction.class.php
index 91a6afc36e..224dd33bd0 100644
--- a/wcfsetup/install/files/lib/data/clipboard/item/ClipboardItemAction.class.php
+++ b/wcfsetup/install/files/lib/data/clipboard/item/ClipboardItemAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\clipboard\item;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\clipboard\ClipboardEditorItem;
diff --git a/wcfsetup/install/files/lib/data/comment/Comment.class.php b/wcfsetup/install/files/lib/data/comment/Comment.class.php
index 142d5ec1fe..8242cb0074 100644
--- a/wcfsetup/install/files/lib/data/comment/Comment.class.php
+++ b/wcfsetup/install/files/lib/data/comment/Comment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\DatabaseObject;
 use wcf\data\IMessage;
diff --git a/wcfsetup/install/files/lib/data/comment/CommentAction.class.php b/wcfsetup/install/files/lib/data/comment/CommentAction.class.php
index d95cde5f25..e52ee2ca15 100644
--- a/wcfsetup/install/files/lib/data/comment/CommentAction.class.php
+++ b/wcfsetup/install/files/lib/data/comment/CommentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseAction;
diff --git a/wcfsetup/install/files/lib/data/comment/CommentEditor.class.php b/wcfsetup/install/files/lib/data/comment/CommentEditor.class.php
index 98571a8637..13ce8c8257 100644
--- a/wcfsetup/install/files/lib/data/comment/CommentEditor.class.php
+++ b/wcfsetup/install/files/lib/data/comment/CommentEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/comment/CommentList.class.php b/wcfsetup/install/files/lib/data/comment/CommentList.class.php
index b7bfd75827..b949ec03bc 100644
--- a/wcfsetup/install/files/lib/data/comment/CommentList.class.php
+++ b/wcfsetup/install/files/lib/data/comment/CommentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/comment/LikeableComment.class.php b/wcfsetup/install/files/lib/data/comment/LikeableComment.class.php
index 88c08bdf4a..43cc6ea95a 100644
--- a/wcfsetup/install/files/lib/data/comment/LikeableComment.class.php
+++ b/wcfsetup/install/files/lib/data/comment/LikeableComment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\like\object\AbstractLikeObject;
 use wcf\data\like\Like;
diff --git a/wcfsetup/install/files/lib/data/comment/LikeableCommentProvider.class.php b/wcfsetup/install/files/lib/data/comment/LikeableCommentProvider.class.php
index c3080841ab..21d202ff41 100644
--- a/wcfsetup/install/files/lib/data/comment/LikeableCommentProvider.class.php
+++ b/wcfsetup/install/files/lib/data/comment/LikeableCommentProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\like\object\ILikeObject;
 use wcf\data\like\ILikeObjectTypeProvider;
diff --git a/wcfsetup/install/files/lib/data/comment/StructuredComment.class.php b/wcfsetup/install/files/lib/data/comment/StructuredComment.class.php
index 67a4214c9b..e3dadc8117 100644
--- a/wcfsetup/install/files/lib/data/comment/StructuredComment.class.php
+++ b/wcfsetup/install/files/lib/data/comment/StructuredComment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\comment\response\StructuredCommentResponse;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/data/comment/StructuredCommentList.class.php b/wcfsetup/install/files/lib/data/comment/StructuredCommentList.class.php
index 90bab9795f..6cd988bd9c 100644
--- a/wcfsetup/install/files/lib/data/comment/StructuredCommentList.class.php
+++ b/wcfsetup/install/files/lib/data/comment/StructuredCommentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\comment\response\CommentResponseList;
 use wcf\data\comment\response\StructuredCommentResponse;
diff --git a/wcfsetup/install/files/lib/data/comment/ViewableComment.class.php b/wcfsetup/install/files/lib/data/comment/ViewableComment.class.php
index 843320ac55..e01cb8e513 100644
--- a/wcfsetup/install/files/lib/data/comment/ViewableComment.class.php
+++ b/wcfsetup/install/files/lib/data/comment/ViewableComment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\data\user\UserProfile;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/comment/ViewableCommentList.class.php b/wcfsetup/install/files/lib/data/comment/ViewableCommentList.class.php
index 9d33e4bfe6..79d7b6596c 100644
--- a/wcfsetup/install/files/lib/data/comment/ViewableCommentList.class.php
+++ b/wcfsetup/install/files/lib/data/comment/ViewableCommentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 
diff --git a/wcfsetup/install/files/lib/data/comment/response/CommentResponse.class.php b/wcfsetup/install/files/lib/data/comment/response/CommentResponse.class.php
index d01ec2a094..6b8b44f8ee 100644
--- a/wcfsetup/install/files/lib/data/comment/response/CommentResponse.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/CommentResponse.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\comment\Comment;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/comment/response/CommentResponseAction.class.php b/wcfsetup/install/files/lib/data/comment/response/CommentResponseAction.class.php
index 7e8835f0db..de8c2dec79 100644
--- a/wcfsetup/install/files/lib/data/comment/response/CommentResponseAction.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/CommentResponseAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentEditor;
diff --git a/wcfsetup/install/files/lib/data/comment/response/CommentResponseEditor.class.php b/wcfsetup/install/files/lib/data/comment/response/CommentResponseEditor.class.php
index 56d6f79277..de5305ceba 100644
--- a/wcfsetup/install/files/lib/data/comment/response/CommentResponseEditor.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/CommentResponseEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/comment/response/CommentResponseList.class.php b/wcfsetup/install/files/lib/data/comment/response/CommentResponseList.class.php
index 13dd1d5056..3f661a20fc 100644
--- a/wcfsetup/install/files/lib/data/comment/response/CommentResponseList.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/CommentResponseList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponse.class.php b/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponse.class.php
index 9742a4f103..7b72837bb6 100644
--- a/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponse.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponse.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\comment\Comment;
 use wcf\data\like\object\AbstractLikeObject;
diff --git a/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponseProvider.class.php b/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponseProvider.class.php
index c16b3a7440..93e53c9651 100644
--- a/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponseProvider.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/LikeableCommentResponseProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\comment\Comment;
 use wcf\data\like\object\ILikeObject;
diff --git a/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponse.class.php b/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponse.class.php
index f0e0b9cb84..f3c7e994be 100644
--- a/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponse.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponse.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\user\UserProfile;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponseList.class.php b/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponseList.class.php
index cc0cdb77dd..dc9a76cdf0 100644
--- a/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponseList.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/StructuredCommentResponseList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\comment\Comment;
 use wcf\data\like\object\LikeObject;
diff --git a/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponse.class.php b/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponse.class.php
index 8b7e3dd53e..1f270094ea 100644
--- a/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponse.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponse.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\data\user\UserProfile;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponseList.class.php b/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponseList.class.php
index 3ff138458c..e82dec647a 100644
--- a/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponseList.class.php
+++ b/wcfsetup/install/files/lib/data/comment/response/ViewableCommentResponseList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\comment\response;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 
diff --git a/wcfsetup/install/files/lib/data/condition/Condition.class.php b/wcfsetup/install/files/lib/data/condition/Condition.class.php
index e6ff87c65a..c8543bf74c 100644
--- a/wcfsetup/install/files/lib/data/condition/Condition.class.php
+++ b/wcfsetup/install/files/lib/data/condition/Condition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\condition;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/condition/ConditionAction.class.php b/wcfsetup/install/files/lib/data/condition/ConditionAction.class.php
index 6773858845..9f08e4102e 100644
--- a/wcfsetup/install/files/lib/data/condition/ConditionAction.class.php
+++ b/wcfsetup/install/files/lib/data/condition/ConditionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\condition;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/condition/ConditionEditor.class.php b/wcfsetup/install/files/lib/data/condition/ConditionEditor.class.php
index 8087fc1b4f..c231e776e9 100644
--- a/wcfsetup/install/files/lib/data/condition/ConditionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/condition/ConditionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\condition;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/condition/ConditionList.class.php b/wcfsetup/install/files/lib/data/condition/ConditionList.class.php
index 1b876cef64..83ab9be1d8 100644
--- a/wcfsetup/install/files/lib/data/condition/ConditionList.class.php
+++ b/wcfsetup/install/files/lib/data/condition/ConditionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\condition;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/contact/option/ContactOption.class.php b/wcfsetup/install/files/lib/data/contact/option/ContactOption.class.php
index 74811d964d..7b6389a8dc 100644
--- a/wcfsetup/install/files/lib/data/contact/option/ContactOption.class.php
+++ b/wcfsetup/install/files/lib/data/contact/option/ContactOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\option;
 use wcf\data\custom\option\CustomOption;
 
diff --git a/wcfsetup/install/files/lib/data/contact/option/ContactOptionAction.class.php b/wcfsetup/install/files/lib/data/contact/option/ContactOptionAction.class.php
index 6d0e0f86e7..41c705573c 100644
--- a/wcfsetup/install/files/lib/data/contact/option/ContactOptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/contact/option/ContactOptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\option;
 use wcf\data\contact\recipient\ContactRecipient;
 use wcf\data\custom\option\CustomOptionAction;
diff --git a/wcfsetup/install/files/lib/data/contact/option/ContactOptionEditor.class.php b/wcfsetup/install/files/lib/data/contact/option/ContactOptionEditor.class.php
index 29276f724a..a30c52388c 100644
--- a/wcfsetup/install/files/lib/data/contact/option/ContactOptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/contact/option/ContactOptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\option;
 use wcf\data\custom\option\CustomOptionEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/contact/option/ContactOptionList.class.php b/wcfsetup/install/files/lib/data/contact/option/ContactOptionList.class.php
index b9758bf46e..99588765fc 100644
--- a/wcfsetup/install/files/lib/data/contact/option/ContactOptionList.class.php
+++ b/wcfsetup/install/files/lib/data/contact/option/ContactOptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\option;
 use wcf\data\custom\option\CustomOptionList;
 
diff --git a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipient.class.php b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipient.class.php
index 9ce5913845..51758bce12 100644
--- a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipient.class.php
+++ b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipient.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\recipient;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientAction.class.php b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientAction.class.php
index 20ade25ee1..97aee4ee8f 100644
--- a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientAction.class.php
+++ b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\recipient;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISortableAction;
diff --git a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientEditor.class.php b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientEditor.class.php
index 1901d23e8c..7ff6fff61c 100644
--- a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientEditor.class.php
+++ b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\recipient;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientList.class.php b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientList.class.php
index bad34e92fc..efd25cf8d2 100644
--- a/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientList.class.php
+++ b/wcfsetup/install/files/lib/data/contact/recipient/ContactRecipientList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\contact\recipient;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/core/object/CoreObject.class.php b/wcfsetup/install/files/lib/data/core/object/CoreObject.class.php
index 44a8c52490..49589ba841 100644
--- a/wcfsetup/install/files/lib/data/core/object/CoreObject.class.php
+++ b/wcfsetup/install/files/lib/data/core/object/CoreObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\core\object;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/core/object/CoreObjectAction.class.php b/wcfsetup/install/files/lib/data/core/object/CoreObjectAction.class.php
index f467d89c81..5cb3082d07 100644
--- a/wcfsetup/install/files/lib/data/core/object/CoreObjectAction.class.php
+++ b/wcfsetup/install/files/lib/data/core/object/CoreObjectAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\core\object;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/core/object/CoreObjectEditor.class.php b/wcfsetup/install/files/lib/data/core/object/CoreObjectEditor.class.php
index af77564382..1ef9221f40 100644
--- a/wcfsetup/install/files/lib/data/core/object/CoreObjectEditor.class.php
+++ b/wcfsetup/install/files/lib/data/core/object/CoreObjectEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\core\object;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/core/object/CoreObjectList.class.php b/wcfsetup/install/files/lib/data/core/object/CoreObjectList.class.php
index 4ca98153fb..8b7c598cd5 100644
--- a/wcfsetup/install/files/lib/data/core/object/CoreObjectList.class.php
+++ b/wcfsetup/install/files/lib/data/core/object/CoreObjectList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\core\object;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/cronjob/Cronjob.class.php b/wcfsetup/install/files/lib/data/cronjob/Cronjob.class.php
index a10ea434ea..3162f70ab0 100644
--- a/wcfsetup/install/files/lib/data/cronjob/Cronjob.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/Cronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob;
 use wcf\data\DatabaseObject;
 use wcf\data\TDatabaseObjectOptions;
diff --git a/wcfsetup/install/files/lib/data/cronjob/CronjobAction.class.php b/wcfsetup/install/files/lib/data/cronjob/CronjobAction.class.php
index 6d4c909485..e5672b5295 100644
--- a/wcfsetup/install/files/lib/data/cronjob/CronjobAction.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/CronjobAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob;
 use wcf\data\cronjob\log\CronjobLogEditor;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/cronjob/CronjobEditor.class.php b/wcfsetup/install/files/lib/data/cronjob/CronjobEditor.class.php
index 9ee8f38101..f94db612b2 100644
--- a/wcfsetup/install/files/lib/data/cronjob/CronjobEditor.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/CronjobEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob;
 use wcf\data\language\category\LanguageCategory;
 use wcf\data\language\LanguageList;
diff --git a/wcfsetup/install/files/lib/data/cronjob/CronjobList.class.php b/wcfsetup/install/files/lib/data/cronjob/CronjobList.class.php
index 7f5b53447f..600a85fe9f 100644
--- a/wcfsetup/install/files/lib/data/cronjob/CronjobList.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/CronjobList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLog.class.php b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLog.class.php
index 8e794e399c..ce900b4d6f 100644
--- a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLog.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLog.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob\log;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogAction.class.php b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogAction.class.php
index d03640f362..a4bbb24d58 100644
--- a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogAction.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob\log;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogEditor.class.php b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogEditor.class.php
index 82f482d27c..aa310183d6 100644
--- a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogEditor.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob\log;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogList.class.php b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogList.class.php
index 85f72771be..d07c353a3e 100644
--- a/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogList.class.php
+++ b/wcfsetup/install/files/lib/data/cronjob/log/CronjobLogList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\cronjob\log;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/custom/option/CustomOption.class.php b/wcfsetup/install/files/lib/data/custom/option/CustomOption.class.php
index ec22b6601d..15a33a79f7 100644
--- a/wcfsetup/install/files/lib/data/custom/option/CustomOption.class.php
+++ b/wcfsetup/install/files/lib/data/custom/option/CustomOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\custom\option;
 use wcf\data\language\Language;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/data/custom/option/CustomOptionAction.class.php b/wcfsetup/install/files/lib/data/custom/option/CustomOptionAction.class.php
index 205388b0f4..3dce9b8c62 100644
--- a/wcfsetup/install/files/lib/data/custom/option/CustomOptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/custom/option/CustomOptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\custom\option;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/custom/option/CustomOptionEditor.class.php b/wcfsetup/install/files/lib/data/custom/option/CustomOptionEditor.class.php
index a7270886da..c31c923004 100644
--- a/wcfsetup/install/files/lib/data/custom/option/CustomOptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/custom/option/CustomOptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\custom\option;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/custom/option/CustomOptionList.class.php b/wcfsetup/install/files/lib/data/custom/option/CustomOptionList.class.php
index 8c5bb394ec..1d4984b698 100644
--- a/wcfsetup/install/files/lib/data/custom/option/CustomOptionList.class.php
+++ b/wcfsetup/install/files/lib/data/custom/option/CustomOptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\custom\option;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php
index 21a6fc6bd7..97a2ece0d3 100644
--- a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\devtools\project;
 use wcf\data\package\installation\plugin\PackageInstallationPluginList;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php
index cd0fd01a50..65352303ad 100644
--- a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\devtools\project;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php
index 3d37476054..ee9906dddd 100644
--- a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\devtools\project;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php
index 01f22fcea5..3af4a64d53 100644
--- a/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php
+++ b/wcfsetup/install/files/lib/data/devtools/project/DevtoolsProjectList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\devtools\project;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntry.class.php b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntry.class.php
index 5044875af1..125000db6d 100644
--- a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntry.class.php
+++ b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntry.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\edit\history\entry;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryAction.class.php b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryAction.class.php
index 8df02f6132..985f64dbf4 100644
--- a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryAction.class.php
+++ b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\edit\history\entry;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryEditor.class.php b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryEditor.class.php
index 2a24700327..e6985964d3 100644
--- a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\edit\history\entry;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryList.class.php b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryList.class.php
index f15a89ff3a..4c74021e11 100644
--- a/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryList.class.php
+++ b/wcfsetup/install/files/lib/data/edit/history/entry/EditHistoryEntryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\edit\history\entry;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/event/listener/EventListener.class.php b/wcfsetup/install/files/lib/data/event/listener/EventListener.class.php
index 743ab6461d..c6977c7a26 100644
--- a/wcfsetup/install/files/lib/data/event/listener/EventListener.class.php
+++ b/wcfsetup/install/files/lib/data/event/listener/EventListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\event\listener;
 use wcf\data\DatabaseObject;
 use wcf\data\TDatabaseObjectOptions;
diff --git a/wcfsetup/install/files/lib/data/event/listener/EventListenerAction.class.php b/wcfsetup/install/files/lib/data/event/listener/EventListenerAction.class.php
index 3c5a4e01f7..79a4ec4ccc 100644
--- a/wcfsetup/install/files/lib/data/event/listener/EventListenerAction.class.php
+++ b/wcfsetup/install/files/lib/data/event/listener/EventListenerAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\event\listener;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/event/listener/EventListenerEditor.class.php b/wcfsetup/install/files/lib/data/event/listener/EventListenerEditor.class.php
index e08ea17579..f0a2f8faff 100644
--- a/wcfsetup/install/files/lib/data/event/listener/EventListenerEditor.class.php
+++ b/wcfsetup/install/files/lib/data/event/listener/EventListenerEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\event\listener;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/event/listener/EventListenerList.class.php b/wcfsetup/install/files/lib/data/event/listener/EventListenerList.class.php
index 2b16118828..923ce02ff2 100644
--- a/wcfsetup/install/files/lib/data/event/listener/EventListenerList.class.php
+++ b/wcfsetup/install/files/lib/data/event/listener/EventListenerList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\event\listener;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/label/Label.class.php b/wcfsetup/install/files/lib/data/label/Label.class.php
index aa89c49d8b..25db2682e0 100644
--- a/wcfsetup/install/files/lib/data/label/Label.class.php
+++ b/wcfsetup/install/files/lib/data/label/Label.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label;
 use wcf\data\DatabaseObject;
 use wcf\system\request\IRouteController;
diff --git a/wcfsetup/install/files/lib/data/label/LabelAction.class.php b/wcfsetup/install/files/lib/data/label/LabelAction.class.php
index ec30850b71..abc815fa24 100644
--- a/wcfsetup/install/files/lib/data/label/LabelAction.class.php
+++ b/wcfsetup/install/files/lib/data/label/LabelAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label;
 use wcf\data\language\item\LanguageItemAction;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/label/LabelEditor.class.php b/wcfsetup/install/files/lib/data/label/LabelEditor.class.php
index 6b9a9603ab..44d91f49fc 100644
--- a/wcfsetup/install/files/lib/data/label/LabelEditor.class.php
+++ b/wcfsetup/install/files/lib/data/label/LabelEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/label/LabelList.class.php b/wcfsetup/install/files/lib/data/label/LabelList.class.php
index 4ca77e2f50..4cdc99c132 100644
--- a/wcfsetup/install/files/lib/data/label/LabelList.class.php
+++ b/wcfsetup/install/files/lib/data/label/LabelList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/label/group/LabelGroup.class.php b/wcfsetup/install/files/lib/data/label/group/LabelGroup.class.php
index d3e603bb45..737f6b0080 100644
--- a/wcfsetup/install/files/lib/data/label/group/LabelGroup.class.php
+++ b/wcfsetup/install/files/lib/data/label/group/LabelGroup.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label\group;
 use wcf\data\DatabaseObject;
 use wcf\system\request\IRouteController;
diff --git a/wcfsetup/install/files/lib/data/label/group/LabelGroupAction.class.php b/wcfsetup/install/files/lib/data/label/group/LabelGroupAction.class.php
index f78a762845..0662988150 100644
--- a/wcfsetup/install/files/lib/data/label/group/LabelGroupAction.class.php
+++ b/wcfsetup/install/files/lib/data/label/group/LabelGroupAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label\group;
 use wcf\data\language\item\LanguageItemAction;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/data/label/group/LabelGroupEditor.class.php b/wcfsetup/install/files/lib/data/label/group/LabelGroupEditor.class.php
index 5c45d54200..2a97c4cabe 100644
--- a/wcfsetup/install/files/lib/data/label/group/LabelGroupEditor.class.php
+++ b/wcfsetup/install/files/lib/data/label/group/LabelGroupEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label\group;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/label/group/LabelGroupList.class.php b/wcfsetup/install/files/lib/data/label/group/LabelGroupList.class.php
index df94e23b2b..601377a67a 100644
--- a/wcfsetup/install/files/lib/data/label/group/LabelGroupList.class.php
+++ b/wcfsetup/install/files/lib/data/label/group/LabelGroupList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label\group;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/label/group/ViewableLabelGroup.class.php b/wcfsetup/install/files/lib/data/label/group/ViewableLabelGroup.class.php
index 67ce515bf7..ede5ffcbce 100644
--- a/wcfsetup/install/files/lib/data/label/group/ViewableLabelGroup.class.php
+++ b/wcfsetup/install/files/lib/data/label/group/ViewableLabelGroup.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\label\group;
 use wcf\data\label\Label;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/language/Language.class.php b/wcfsetup/install/files/lib/data/language/Language.class.php
index d7cd7228f8..e0976d19c5 100644
--- a/wcfsetup/install/files/lib/data/language/Language.class.php
+++ b/wcfsetup/install/files/lib/data/language/Language.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language;
 use wcf\data\DatabaseObject;
 use wcf\system\language\LanguageFactory;
diff --git a/wcfsetup/install/files/lib/data/language/LanguageAction.class.php b/wcfsetup/install/files/lib/data/language/LanguageAction.class.php
index 2cacc70e20..33fb3cf1df 100644
--- a/wcfsetup/install/files/lib/data/language/LanguageAction.class.php
+++ b/wcfsetup/install/files/lib/data/language/LanguageAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/language/LanguageEditor.class.php b/wcfsetup/install/files/lib/data/language/LanguageEditor.class.php
index 25680553c4..0b344fcff1 100644
--- a/wcfsetup/install/files/lib/data/language/LanguageEditor.class.php
+++ b/wcfsetup/install/files/lib/data/language/LanguageEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language;
 use wcf\data\language\category\LanguageCategory;
 use wcf\data\language\category\LanguageCategoryEditor;
diff --git a/wcfsetup/install/files/lib/data/language/LanguageList.class.php b/wcfsetup/install/files/lib/data/language/LanguageList.class.php
index c32f4be47d..310736d76b 100644
--- a/wcfsetup/install/files/lib/data/language/LanguageList.class.php
+++ b/wcfsetup/install/files/lib/data/language/LanguageList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/language/SetupLanguage.class.php b/wcfsetup/install/files/lib/data/language/SetupLanguage.class.php
index 086cbf8a61..b6dc1c91a1 100644
--- a/wcfsetup/install/files/lib/data/language/SetupLanguage.class.php
+++ b/wcfsetup/install/files/lib/data/language/SetupLanguage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language;
 use wcf\system\exception\SystemException;
 use wcf\system\io\File;
diff --git a/wcfsetup/install/files/lib/data/language/category/LanguageCategory.class.php b/wcfsetup/install/files/lib/data/language/category/LanguageCategory.class.php
index 07253b9f8f..442d076aa0 100644
--- a/wcfsetup/install/files/lib/data/language/category/LanguageCategory.class.php
+++ b/wcfsetup/install/files/lib/data/language/category/LanguageCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\category;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/language/category/LanguageCategoryAction.class.php b/wcfsetup/install/files/lib/data/language/category/LanguageCategoryAction.class.php
index 24ed1b37f7..6150e48bf0 100644
--- a/wcfsetup/install/files/lib/data/language/category/LanguageCategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/language/category/LanguageCategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\category;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/language/category/LanguageCategoryEditor.class.php b/wcfsetup/install/files/lib/data/language/category/LanguageCategoryEditor.class.php
index 29ce042e5c..8744e90a72 100644
--- a/wcfsetup/install/files/lib/data/language/category/LanguageCategoryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/language/category/LanguageCategoryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\category;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/language/category/LanguageCategoryList.class.php b/wcfsetup/install/files/lib/data/language/category/LanguageCategoryList.class.php
index a1dc18a747..8801ab65a7 100644
--- a/wcfsetup/install/files/lib/data/language/category/LanguageCategoryList.class.php
+++ b/wcfsetup/install/files/lib/data/language/category/LanguageCategoryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\category;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/language/item/LanguageItem.class.php b/wcfsetup/install/files/lib/data/language/item/LanguageItem.class.php
index c4c5a0c659..a041eaec41 100644
--- a/wcfsetup/install/files/lib/data/language/item/LanguageItem.class.php
+++ b/wcfsetup/install/files/lib/data/language/item/LanguageItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\item;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/language/item/LanguageItemAction.class.php b/wcfsetup/install/files/lib/data/language/item/LanguageItemAction.class.php
index 11d9cd7849..82c5b0f81a 100644
--- a/wcfsetup/install/files/lib/data/language/item/LanguageItemAction.class.php
+++ b/wcfsetup/install/files/lib/data/language/item/LanguageItemAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\item;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/data/language/item/LanguageItemEditor.class.php b/wcfsetup/install/files/lib/data/language/item/LanguageItemEditor.class.php
index b5550c9dbd..5e507d6cb6 100644
--- a/wcfsetup/install/files/lib/data/language/item/LanguageItemEditor.class.php
+++ b/wcfsetup/install/files/lib/data/language/item/LanguageItemEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\item;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/language/item/LanguageItemList.class.php b/wcfsetup/install/files/lib/data/language/item/LanguageItemList.class.php
index 7f774f4cdc..64b811bb8e 100644
--- a/wcfsetup/install/files/lib/data/language/item/LanguageItemList.class.php
+++ b/wcfsetup/install/files/lib/data/language/item/LanguageItemList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\language\item;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/like/ILikeObjectTypeProvider.class.php b/wcfsetup/install/files/lib/data/like/ILikeObjectTypeProvider.class.php
index 30f9656ab8..08626827da 100644
--- a/wcfsetup/install/files/lib/data/like/ILikeObjectTypeProvider.class.php
+++ b/wcfsetup/install/files/lib/data/like/ILikeObjectTypeProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\like\object\ILikeObject;
 use wcf\data\object\type\IObjectTypeProvider;
diff --git a/wcfsetup/install/files/lib/data/like/IRestrictedLikeObjectTypeProvider.class.php b/wcfsetup/install/files/lib/data/like/IRestrictedLikeObjectTypeProvider.class.php
index 7ca6414109..85bd607386 100644
--- a/wcfsetup/install/files/lib/data/like/IRestrictedLikeObjectTypeProvider.class.php
+++ b/wcfsetup/install/files/lib/data/like/IRestrictedLikeObjectTypeProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\like\object\ILikeObject;
 
diff --git a/wcfsetup/install/files/lib/data/like/Like.class.php b/wcfsetup/install/files/lib/data/like/Like.class.php
index bff9bbb44b..b60fb28605 100644
--- a/wcfsetup/install/files/lib/data/like/Like.class.php
+++ b/wcfsetup/install/files/lib/data/like/Like.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/like/LikeAction.class.php b/wcfsetup/install/files/lib/data/like/LikeAction.class.php
index 319afa6406..8f143e8228 100644
--- a/wcfsetup/install/files/lib/data/like/LikeAction.class.php
+++ b/wcfsetup/install/files/lib/data/like/LikeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\like\object\LikeObjectEditor;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/data/like/LikeEditor.class.php b/wcfsetup/install/files/lib/data/like/LikeEditor.class.php
index 6e96f7a73f..8ddca83319 100644
--- a/wcfsetup/install/files/lib/data/like/LikeEditor.class.php
+++ b/wcfsetup/install/files/lib/data/like/LikeEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/like/LikeList.class.php b/wcfsetup/install/files/lib/data/like/LikeList.class.php
index bc5e0e55c8..6941b55d0f 100644
--- a/wcfsetup/install/files/lib/data/like/LikeList.class.php
+++ b/wcfsetup/install/files/lib/data/like/LikeList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/like/ViewableLike.class.php b/wcfsetup/install/files/lib/data/like/ViewableLike.class.php
index b8afa50350..1f56f12d9d 100644
--- a/wcfsetup/install/files/lib/data/like/ViewableLike.class.php
+++ b/wcfsetup/install/files/lib/data/like/ViewableLike.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/data/like/ViewableLikeList.class.php b/wcfsetup/install/files/lib/data/like/ViewableLikeList.class.php
index 93ee242be9..48c4a77d01 100644
--- a/wcfsetup/install/files/lib/data/like/ViewableLikeList.class.php
+++ b/wcfsetup/install/files/lib/data/like/ViewableLikeList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/data/like/object/AbstractLikeObject.class.php b/wcfsetup/install/files/lib/data/like/object/AbstractLikeObject.class.php
index 971228da9d..e8a049ada4 100644
--- a/wcfsetup/install/files/lib/data/like/object/AbstractLikeObject.class.php
+++ b/wcfsetup/install/files/lib/data/like/object/AbstractLikeObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like\object;
 use wcf\data\like\Like;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/data/like/object/ILikeObject.class.php b/wcfsetup/install/files/lib/data/like/object/ILikeObject.class.php
index 3786337ecc..4d1b39d0c1 100644
--- a/wcfsetup/install/files/lib/data/like/object/ILikeObject.class.php
+++ b/wcfsetup/install/files/lib/data/like/object/ILikeObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like\object;
 use wcf\data\like\Like;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/data/like/object/LikeObject.class.php b/wcfsetup/install/files/lib/data/like/object/LikeObject.class.php
index 000abd111a..c5f3039a8b 100644
--- a/wcfsetup/install/files/lib/data/like/object/LikeObject.class.php
+++ b/wcfsetup/install/files/lib/data/like/object/LikeObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like\object;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/like/object/LikeObjectEditor.class.php b/wcfsetup/install/files/lib/data/like/object/LikeObjectEditor.class.php
index c48f248be3..19eab68ec0 100644
--- a/wcfsetup/install/files/lib/data/like/object/LikeObjectEditor.class.php
+++ b/wcfsetup/install/files/lib/data/like/object/LikeObjectEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like\object;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/like/object/LikeObjectList.class.php b/wcfsetup/install/files/lib/data/like/object/LikeObjectList.class.php
index ce228d98cc..74f8740b40 100644
--- a/wcfsetup/install/files/lib/data/like/object/LikeObjectList.class.php
+++ b/wcfsetup/install/files/lib/data/like/object/LikeObjectList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\like\object;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/media/Media.class.php b/wcfsetup/install/files/lib/data/media/Media.class.php
index 6c9af61684..3666959b53 100644
--- a/wcfsetup/install/files/lib/data/media/Media.class.php
+++ b/wcfsetup/install/files/lib/data/media/Media.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\media;
 use wcf\data\DatabaseObject;
 use wcf\data\ILinkableObject;
diff --git a/wcfsetup/install/files/lib/data/media/MediaAction.class.php b/wcfsetup/install/files/lib/data/media/MediaAction.class.php
index ac53c452f0..055a46043d 100644
--- a/wcfsetup/install/files/lib/data/media/MediaAction.class.php
+++ b/wcfsetup/install/files/lib/data/media/MediaAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\media;
 use wcf\data\category\CategoryNodeTree;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/media/MediaEditor.class.php b/wcfsetup/install/files/lib/data/media/MediaEditor.class.php
index 03b82b5126..24ea818352 100644
--- a/wcfsetup/install/files/lib/data/media/MediaEditor.class.php
+++ b/wcfsetup/install/files/lib/data/media/MediaEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\media;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/media/MediaList.class.php b/wcfsetup/install/files/lib/data/media/MediaList.class.php
index 3793ea1cf3..d167741831 100644
--- a/wcfsetup/install/files/lib/data/media/MediaList.class.php
+++ b/wcfsetup/install/files/lib/data/media/MediaList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\media;
 use wcf\data\DatabaseObjectList;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/data/media/ViewableMedia.class.php b/wcfsetup/install/files/lib/data/media/ViewableMedia.class.php
index ef02f98b3a..c61b65420c 100644
--- a/wcfsetup/install/files/lib/data/media/ViewableMedia.class.php
+++ b/wcfsetup/install/files/lib/data/media/ViewableMedia.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\media;
 use wcf\data\user\UserProfile;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/media/ViewableMediaList.class.php b/wcfsetup/install/files/lib/data/media/ViewableMediaList.class.php
index e8a7be6996..fc9ffdaee8 100644
--- a/wcfsetup/install/files/lib/data/media/ViewableMediaList.class.php
+++ b/wcfsetup/install/files/lib/data/media/ViewableMediaList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\media;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/data/menu/Menu.class.php b/wcfsetup/install/files/lib/data/menu/Menu.class.php
index bdbab8f970..cd68cc500c 100644
--- a/wcfsetup/install/files/lib/data/menu/Menu.class.php
+++ b/wcfsetup/install/files/lib/data/menu/Menu.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu;
 use wcf\data\box\Box;
 use wcf\data\menu\item\MenuItemNodeTree;
diff --git a/wcfsetup/install/files/lib/data/menu/MenuAction.class.php b/wcfsetup/install/files/lib/data/menu/MenuAction.class.php
index 66d6cc082f..c418814814 100644
--- a/wcfsetup/install/files/lib/data/menu/MenuAction.class.php
+++ b/wcfsetup/install/files/lib/data/menu/MenuAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu;
 use wcf\data\box\BoxAction;
 use wcf\data\box\BoxEditor;
diff --git a/wcfsetup/install/files/lib/data/menu/MenuCache.class.php b/wcfsetup/install/files/lib/data/menu/MenuCache.class.php
index ec82279391..1a05ed165b 100644
--- a/wcfsetup/install/files/lib/data/menu/MenuCache.class.php
+++ b/wcfsetup/install/files/lib/data/menu/MenuCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu;
 use wcf\data\menu\item\MenuItemList;
 use wcf\system\cache\builder\MenuCacheBuilder;
diff --git a/wcfsetup/install/files/lib/data/menu/MenuEditor.class.php b/wcfsetup/install/files/lib/data/menu/MenuEditor.class.php
index a946750a2a..9fa7d7bb6a 100644
--- a/wcfsetup/install/files/lib/data/menu/MenuEditor.class.php
+++ b/wcfsetup/install/files/lib/data/menu/MenuEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/menu/MenuList.class.php b/wcfsetup/install/files/lib/data/menu/MenuList.class.php
index d7f04a5682..6b31bfb486 100644
--- a/wcfsetup/install/files/lib/data/menu/MenuList.class.php
+++ b/wcfsetup/install/files/lib/data/menu/MenuList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/menu/item/MenuItem.class.php b/wcfsetup/install/files/lib/data/menu/item/MenuItem.class.php
index 2c4d0078ca..bef5402766 100644
--- a/wcfsetup/install/files/lib/data/menu/item/MenuItem.class.php
+++ b/wcfsetup/install/files/lib/data/menu/item/MenuItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu\item;
 use wcf\data\page\Page;
 use wcf\data\page\PageCache;
diff --git a/wcfsetup/install/files/lib/data/menu/item/MenuItemAction.class.php b/wcfsetup/install/files/lib/data/menu/item/MenuItemAction.class.php
index b857eb7780..9baddb992a 100644
--- a/wcfsetup/install/files/lib/data/menu/item/MenuItemAction.class.php
+++ b/wcfsetup/install/files/lib/data/menu/item/MenuItemAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu\item;
 use wcf\data\menu\Menu;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/menu/item/MenuItemEditor.class.php b/wcfsetup/install/files/lib/data/menu/item/MenuItemEditor.class.php
index e914a02050..51b98205ff 100644
--- a/wcfsetup/install/files/lib/data/menu/item/MenuItemEditor.class.php
+++ b/wcfsetup/install/files/lib/data/menu/item/MenuItemEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu\item;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/menu/item/MenuItemList.class.php b/wcfsetup/install/files/lib/data/menu/item/MenuItemList.class.php
index 848dcb7e8c..82b04ae466 100644
--- a/wcfsetup/install/files/lib/data/menu/item/MenuItemList.class.php
+++ b/wcfsetup/install/files/lib/data/menu/item/MenuItemList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu\item;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/menu/item/MenuItemNode.class.php b/wcfsetup/install/files/lib/data/menu/item/MenuItemNode.class.php
index faf8fa5fbe..6fa4ef4ab0 100644
--- a/wcfsetup/install/files/lib/data/menu/item/MenuItemNode.class.php
+++ b/wcfsetup/install/files/lib/data/menu/item/MenuItemNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu\item;
 use wcf\data\DatabaseObjectDecorator;
 
diff --git a/wcfsetup/install/files/lib/data/menu/item/MenuItemNodeTree.class.php b/wcfsetup/install/files/lib/data/menu/item/MenuItemNodeTree.class.php
index f172bab73f..444084f985 100644
--- a/wcfsetup/install/files/lib/data/menu/item/MenuItemNodeTree.class.php
+++ b/wcfsetup/install/files/lib/data/menu/item/MenuItemNodeTree.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\menu\item;
 use wcf\system\page\PageLocationManager;
 use wcf\system\request\RequestHandler;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueue.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueue.class.php
index c9807dead5..1ee11c0ef8 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueue.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueue.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueAction.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueAction.class.php
index 5a67fc7884..1e6f5cd304 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueAction.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueActivationAction.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueActivationAction.class.php
index 42a45366fb..214735f34c 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueActivationAction.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueActivationAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\system\exception\PermissionDeniedException;
 use wcf\system\moderation\queue\ModerationQueueActivationManager;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueEditor.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueEditor.class.php
index 30b05f18d9..b7016abdb3 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueEditor.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\moderation\queue\ModerationQueueManager;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueList.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueList.class.php
index fbc5b73d40..10f2c565b9 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueList.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueReportAction.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueReportAction.class.php
index a2a09af848..86d59a1495 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueReportAction.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ModerationQueueReportAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\system\exception\PermissionDeniedException;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueue.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueue.class.php
index 0cb6eda98f..5bf620d255 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueue.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueue.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueueList.class.php b/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueueList.class.php
index 868437de38..32fc1489c8 100644
--- a/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueueList.class.php
+++ b/wcfsetup/install/files/lib/data/moderation/queue/ViewableModerationQueueList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\moderation\queue;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 use wcf\system\moderation\queue\ModerationQueueManager;
diff --git a/wcfsetup/install/files/lib/data/modification/log/ModificationLog.class.php b/wcfsetup/install/files/lib/data/modification/log/ModificationLog.class.php
index 0b810f707f..04c43fb86c 100644
--- a/wcfsetup/install/files/lib/data/modification/log/ModificationLog.class.php
+++ b/wcfsetup/install/files/lib/data/modification/log/ModificationLog.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\modification\log;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/modification/log/ModificationLogAction.class.php b/wcfsetup/install/files/lib/data/modification/log/ModificationLogAction.class.php
index c96c67b409..4ed5dcd5e8 100644
--- a/wcfsetup/install/files/lib/data/modification/log/ModificationLogAction.class.php
+++ b/wcfsetup/install/files/lib/data/modification/log/ModificationLogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\modification\log;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/modification/log/ModificationLogEditor.class.php b/wcfsetup/install/files/lib/data/modification/log/ModificationLogEditor.class.php
index 7012be0f0b..110137cfb1 100644
--- a/wcfsetup/install/files/lib/data/modification/log/ModificationLogEditor.class.php
+++ b/wcfsetup/install/files/lib/data/modification/log/ModificationLogEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\modification\log;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/modification/log/ModificationLogList.class.php b/wcfsetup/install/files/lib/data/modification/log/ModificationLogList.class.php
index ba0886ae13..8bb1c25074 100644
--- a/wcfsetup/install/files/lib/data/modification/log/ModificationLogList.class.php
+++ b/wcfsetup/install/files/lib/data/modification/log/ModificationLogList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\modification\log;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/notice/Notice.class.php b/wcfsetup/install/files/lib/data/notice/Notice.class.php
index e418a9cd09..b696f8e931 100644
--- a/wcfsetup/install/files/lib/data/notice/Notice.class.php
+++ b/wcfsetup/install/files/lib/data/notice/Notice.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\notice;
 use wcf\data\condition\Condition;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/notice/NoticeAction.class.php b/wcfsetup/install/files/lib/data/notice/NoticeAction.class.php
index 8208b5dd45..590321eab0 100644
--- a/wcfsetup/install/files/lib/data/notice/NoticeAction.class.php
+++ b/wcfsetup/install/files/lib/data/notice/NoticeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\notice;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISortableAction;
diff --git a/wcfsetup/install/files/lib/data/notice/NoticeEditor.class.php b/wcfsetup/install/files/lib/data/notice/NoticeEditor.class.php
index 3d35d322c4..007d2fbf3e 100644
--- a/wcfsetup/install/files/lib/data/notice/NoticeEditor.class.php
+++ b/wcfsetup/install/files/lib/data/notice/NoticeEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\notice;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/notice/NoticeList.class.php b/wcfsetup/install/files/lib/data/notice/NoticeList.class.php
index 5f3cfc0679..00071dec96 100644
--- a/wcfsetup/install/files/lib/data/notice/NoticeList.class.php
+++ b/wcfsetup/install/files/lib/data/notice/NoticeList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\notice;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProcessor.class.php b/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProcessor.class.php
index 4844eb5d7c..747431c52e 100644
--- a/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProcessor.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\DatabaseObjectDecorator;
 use wcf\data\IDatabaseObjectProcessor;
diff --git a/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProvider.class.php b/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProvider.class.php
index d078ff167e..3dd156dc9a 100644
--- a/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProvider.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/AbstractObjectTypeProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/IObjectTypeProvider.class.php b/wcfsetup/install/files/lib/data/object/type/IObjectTypeProvider.class.php
index e6568beeaf..77dedb619f 100644
--- a/wcfsetup/install/files/lib/data/object/type/IObjectTypeProvider.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/IObjectTypeProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/ObjectType.class.php b/wcfsetup/install/files/lib/data/object/type/ObjectType.class.php
index fde945aff3..e3eac8eb76 100644
--- a/wcfsetup/install/files/lib/data/object/type/ObjectType.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/ObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\object\type\definition\ObjectTypeDefinition;
 use wcf\data\ProcessibleDatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/object/type/ObjectTypeAction.class.php b/wcfsetup/install/files/lib/data/object/type/ObjectTypeAction.class.php
index 1b18737996..0b828559ec 100644
--- a/wcfsetup/install/files/lib/data/object/type/ObjectTypeAction.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/ObjectTypeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/ObjectTypeCache.class.php b/wcfsetup/install/files/lib/data/object/type/ObjectTypeCache.class.php
index a24b75580a..217ad00e53 100644
--- a/wcfsetup/install/files/lib/data/object/type/ObjectTypeCache.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/ObjectTypeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\object\type\definition\ObjectTypeDefinition;
 use wcf\system\cache\builder\ObjectTypeCacheBuilder;
diff --git a/wcfsetup/install/files/lib/data/object/type/ObjectTypeEditor.class.php b/wcfsetup/install/files/lib/data/object/type/ObjectTypeEditor.class.php
index d2e39a9ff0..974627947c 100644
--- a/wcfsetup/install/files/lib/data/object/type/ObjectTypeEditor.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/ObjectTypeEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/object/type/ObjectTypeList.class.php b/wcfsetup/install/files/lib/data/object/type/ObjectTypeList.class.php
index ed5f873dde..3c5cacc9a6 100644
--- a/wcfsetup/install/files/lib/data/object/type/ObjectTypeList.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/ObjectTypeList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/SitemapObjectTypeAction.class.php b/wcfsetup/install/files/lib/data/object/type/SitemapObjectTypeAction.class.php
index 0e5b71a963..c6b5b33eef 100644
--- a/wcfsetup/install/files/lib/data/object/type/SitemapObjectTypeAction.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/SitemapObjectTypeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type;
 use wcf\data\IToggleAction;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinition.class.php b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinition.class.php
index ddb32e5ce1..ec9e27222a 100644
--- a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinition.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type\definition;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionAction.class.php b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionAction.class.php
index b6c6dd355b..171a172678 100644
--- a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionAction.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type\definition;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionEditor.class.php b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionEditor.class.php
index c1b7b6c869..d9222c6e0c 100644
--- a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type\definition;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionList.class.php b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionList.class.php
index 3bd438a864..819d1fde4e 100644
--- a/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionList.class.php
+++ b/wcfsetup/install/files/lib/data/object/type/definition/ObjectTypeDefinitionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\object\type\definition;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/option/Option.class.php b/wcfsetup/install/files/lib/data/option/Option.class.php
index f0f773e73d..dbf5e108d9 100644
--- a/wcfsetup/install/files/lib/data/option/Option.class.php
+++ b/wcfsetup/install/files/lib/data/option/Option.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option;
 use wcf\data\DatabaseObject;
 use wcf\data\TDatabaseObjectOptions;
diff --git a/wcfsetup/install/files/lib/data/option/OptionAction.class.php b/wcfsetup/install/files/lib/data/option/OptionAction.class.php
index 2f00dc81bd..a4392eafb5 100644
--- a/wcfsetup/install/files/lib/data/option/OptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/option/OptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\email\transport\SmtpEmailTransport;
diff --git a/wcfsetup/install/files/lib/data/option/OptionEditor.class.php b/wcfsetup/install/files/lib/data/option/OptionEditor.class.php
index e3df69226e..c15e17cd8b 100644
--- a/wcfsetup/install/files/lib/data/option/OptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/option/OptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option;
 use wcf\data\user\group\UserGroupEditor;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/option/OptionList.class.php b/wcfsetup/install/files/lib/data/option/OptionList.class.php
index e74c82ce3d..90d830946a 100644
--- a/wcfsetup/install/files/lib/data/option/OptionList.class.php
+++ b/wcfsetup/install/files/lib/data/option/OptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/option/category/OptionCategory.class.php b/wcfsetup/install/files/lib/data/option/category/OptionCategory.class.php
index ae8511fe30..8390667f39 100644
--- a/wcfsetup/install/files/lib/data/option/category/OptionCategory.class.php
+++ b/wcfsetup/install/files/lib/data/option/category/OptionCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option\category;
 use wcf\data\DatabaseObject;
 use wcf\data\TDatabaseObjectOptions;
diff --git a/wcfsetup/install/files/lib/data/option/category/OptionCategoryAction.class.php b/wcfsetup/install/files/lib/data/option/category/OptionCategoryAction.class.php
index 90f33d04c2..8992865ac5 100644
--- a/wcfsetup/install/files/lib/data/option/category/OptionCategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/option/category/OptionCategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option\category;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/option/category/OptionCategoryEditor.class.php b/wcfsetup/install/files/lib/data/option/category/OptionCategoryEditor.class.php
index 5257d7bbc9..0fc30d7362 100644
--- a/wcfsetup/install/files/lib/data/option/category/OptionCategoryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/option/category/OptionCategoryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option\category;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/option/category/OptionCategoryList.class.php b/wcfsetup/install/files/lib/data/option/category/OptionCategoryList.class.php
index 64b1158087..e808f69871 100644
--- a/wcfsetup/install/files/lib/data/option/category/OptionCategoryList.class.php
+++ b/wcfsetup/install/files/lib/data/option/category/OptionCategoryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\option\category;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/package/Package.class.php b/wcfsetup/install/files/lib/data/package/Package.class.php
index e488a0c505..451340b7cc 100644
--- a/wcfsetup/install/files/lib/data/package/Package.class.php
+++ b/wcfsetup/install/files/lib/data/package/Package.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package;
 use wcf\data\DatabaseObject;
 use wcf\system\package\PackageInstallationDispatcher;
diff --git a/wcfsetup/install/files/lib/data/package/PackageAction.class.php b/wcfsetup/install/files/lib/data/package/PackageAction.class.php
index e8d2c39c68..4c8c15a69e 100644
--- a/wcfsetup/install/files/lib/data/package/PackageAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/PackageAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/data/package/PackageCache.class.php b/wcfsetup/install/files/lib/data/package/PackageCache.class.php
index 3f07ff880d..c40594f81b 100644
--- a/wcfsetup/install/files/lib/data/package/PackageCache.class.php
+++ b/wcfsetup/install/files/lib/data/package/PackageCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package;
 use wcf\system\cache\builder\PackageCacheBuilder;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/data/package/PackageEditor.class.php b/wcfsetup/install/files/lib/data/package/PackageEditor.class.php
index 4219b8b80e..766ffc87ce 100644
--- a/wcfsetup/install/files/lib/data/package/PackageEditor.class.php
+++ b/wcfsetup/install/files/lib/data/package/PackageEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/package/PackageList.class.php b/wcfsetup/install/files/lib/data/package/PackageList.class.php
index 3c5860ee13..0d88e6f07d 100644
--- a/wcfsetup/install/files/lib/data/package/PackageList.class.php
+++ b/wcfsetup/install/files/lib/data/package/PackageList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPlugin.class.php
index ef250acdae..e26818581f 100644
--- a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\plugin;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php
index 9d9feea1e8..a3035be884 100644
--- a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\plugin;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\data\option\OptionEditor;
diff --git a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginEditor.class.php b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginEditor.class.php
index 0b72fbd364..af7b622c78 100644
--- a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginEditor.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\plugin;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginList.class.php b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginList.class.php
index f599d58a09..83b24e1c8e 100644
--- a/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginList.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/plugin/PackageInstallationPluginList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\plugin;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueue.class.php b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueue.class.php
index 550270a3b4..86c1f337e7 100644
--- a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueue.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueue.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\queue;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueAction.class.php b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueAction.class.php
index 1129fec97b..1507e5ba59 100644
--- a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\queue;
 use wcf\data\package\Package;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueEditor.class.php b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueEditor.class.php
index f5083843a8..76b3cba621 100644
--- a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueEditor.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\queue;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueList.class.php b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueList.class.php
index 1a5842e938..3b082ad8bf 100644
--- a/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueList.class.php
+++ b/wcfsetup/install/files/lib/data/package/installation/queue/PackageInstallationQueueList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\installation\queue;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/PackageUpdate.class.php b/wcfsetup/install/files/lib/data/package/update/PackageUpdate.class.php
index e22449749b..8b96b6fb9a 100644
--- a/wcfsetup/install/files/lib/data/package/update/PackageUpdate.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/PackageUpdate.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/PackageUpdateAction.class.php b/wcfsetup/install/files/lib/data/package/update/PackageUpdateAction.class.php
index 1e22ffcae9..5d09626b55 100644
--- a/wcfsetup/install/files/lib/data/package/update/PackageUpdateAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/PackageUpdateAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
 use wcf\data\package\installation\queue\PackageInstallationQueueEditor;
diff --git a/wcfsetup/install/files/lib/data/package/update/PackageUpdateEditor.class.php b/wcfsetup/install/files/lib/data/package/update/PackageUpdateEditor.class.php
index 1c110e12aa..441331ab90 100644
--- a/wcfsetup/install/files/lib/data/package/update/PackageUpdateEditor.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/PackageUpdateEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/PackageUpdateList.class.php b/wcfsetup/install/files/lib/data/package/update/PackageUpdateList.class.php
index 2be9e9f31f..d9f8744f9b 100644
--- a/wcfsetup/install/files/lib/data/package/update/PackageUpdateList.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/PackageUpdateList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update;
 use wcf\data\DatabaseObjectList;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/data/package/update/ViewablePackageUpdate.class.php b/wcfsetup/install/files/lib/data/package/update/ViewablePackageUpdate.class.php
index 3b4fb38b78..14d6dee9dd 100644
--- a/wcfsetup/install/files/lib/data/package/update/ViewablePackageUpdate.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/ViewablePackageUpdate.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update;
 use wcf\data\package\update\version\PackageUpdateVersion;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServer.class.php b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServer.class.php
index 03fa2c072e..66c0033e31 100644
--- a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServer.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\server;
 use wcf\data\DatabaseObject;
 use wcf\system\io\RemoteFile;
diff --git a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerAction.class.php b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerAction.class.php
index 381deacddd..8b4b10fce6 100644
--- a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\server;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerEditor.class.php b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerEditor.class.php
index 67534b41fd..8567288738 100644
--- a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerEditor.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\server;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerList.class.php b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerList.class.php
index b7bebd0031..d0e67eb50e 100644
--- a/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerList.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/server/PackageUpdateServerList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\server;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersion.class.php b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersion.class.php
index 2ef8335d5b..bc1d4aa838 100644
--- a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersion.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersion.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\version;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionAction.class.php b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionAction.class.php
index c95b010465..1548c9f47c 100644
--- a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionAction.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\version;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionEditor.class.php b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionEditor.class.php
index bd62ea30c1..00dcb6e06c 100644
--- a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\version;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionList.class.php b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionList.class.php
index c7d1e492d3..698cae6471 100644
--- a/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionList.class.php
+++ b/wcfsetup/install/files/lib/data/package/update/version/PackageUpdateVersionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\package\update\version;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/page/Page.class.php b/wcfsetup/install/files/lib/data/page/Page.class.php
index bef7da43d6..1331abc29b 100644
--- a/wcfsetup/install/files/lib/data/page/Page.class.php
+++ b/wcfsetup/install/files/lib/data/page/Page.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\page\content\PageContent;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/page/PageAction.class.php b/wcfsetup/install/files/lib/data/page/PageAction.class.php
index 17be30f503..13a3feea31 100644
--- a/wcfsetup/install/files/lib/data/page/PageAction.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\box\Box;
 use wcf\data\page\content\PageContent;
diff --git a/wcfsetup/install/files/lib/data/page/PageCache.class.php b/wcfsetup/install/files/lib/data/page/PageCache.class.php
index 1f9f7def42..e6465791a7 100644
--- a/wcfsetup/install/files/lib/data/page/PageCache.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\system\cache\builder\PageCacheBuilder;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/data/page/PageEditor.class.php b/wcfsetup/install/files/lib/data/page/PageEditor.class.php
index caaf344871..69b3a50368 100644
--- a/wcfsetup/install/files/lib/data/page/PageEditor.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\package\PackageCache;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/page/PageLanguage.class.php b/wcfsetup/install/files/lib/data/page/PageLanguage.class.php
index 8c636c67f1..681de8ea1d 100644
--- a/wcfsetup/install/files/lib/data/page/PageLanguage.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageLanguage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\language\Language;
 use wcf\system\language\LanguageFactory;
diff --git a/wcfsetup/install/files/lib/data/page/PageList.class.php b/wcfsetup/install/files/lib/data/page/PageList.class.php
index 81659c12fd..1e4fa18dd0 100644
--- a/wcfsetup/install/files/lib/data/page/PageList.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/page/PageNode.class.php b/wcfsetup/install/files/lib/data/page/PageNode.class.php
index 795eeed71a..34cd41e36e 100644
--- a/wcfsetup/install/files/lib/data/page/PageNode.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\DatabaseObjectDecorator;
 
diff --git a/wcfsetup/install/files/lib/data/page/PageNodeTree.class.php b/wcfsetup/install/files/lib/data/page/PageNodeTree.class.php
index 6071f22fe1..1cd9ebc04c 100644
--- a/wcfsetup/install/files/lib/data/page/PageNodeTree.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageNodeTree.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/page/PageVersionTracker.class.php b/wcfsetup/install/files/lib/data/page/PageVersionTracker.class.php
index 35be7ef5cf..25459360ba 100644
--- a/wcfsetup/install/files/lib/data/page/PageVersionTracker.class.php
+++ b/wcfsetup/install/files/lib/data/page/PageVersionTracker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page;
 use wcf\data\page\content\PageContent;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/page/content/PageContent.class.php b/wcfsetup/install/files/lib/data/page/content/PageContent.class.php
index 75e17f7d51..3b441ca7f1 100644
--- a/wcfsetup/install/files/lib/data/page/content/PageContent.class.php
+++ b/wcfsetup/install/files/lib/data/page/content/PageContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page\content;
 use wcf\data\DatabaseObject;
 use wcf\data\ILinkableObject;
diff --git a/wcfsetup/install/files/lib/data/page/content/PageContentAction.class.php b/wcfsetup/install/files/lib/data/page/content/PageContentAction.class.php
index 17a51daed3..74d917c55f 100644
--- a/wcfsetup/install/files/lib/data/page/content/PageContentAction.class.php
+++ b/wcfsetup/install/files/lib/data/page/content/PageContentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page\content;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/page/content/PageContentEditor.class.php b/wcfsetup/install/files/lib/data/page/content/PageContentEditor.class.php
index e4b56ae5d7..e625a3fe2b 100644
--- a/wcfsetup/install/files/lib/data/page/content/PageContentEditor.class.php
+++ b/wcfsetup/install/files/lib/data/page/content/PageContentEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page\content;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/page/content/PageContentList.class.php b/wcfsetup/install/files/lib/data/page/content/PageContentList.class.php
index 200e9900e7..6c3b9e92ab 100644
--- a/wcfsetup/install/files/lib/data/page/content/PageContentList.class.php
+++ b/wcfsetup/install/files/lib/data/page/content/PageContentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page\content;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/page/content/SearchResultPageContent.class.php b/wcfsetup/install/files/lib/data/page/content/SearchResultPageContent.class.php
index b498bd008e..f2d330878c 100644
--- a/wcfsetup/install/files/lib/data/page/content/SearchResultPageContent.class.php
+++ b/wcfsetup/install/files/lib/data/page/content/SearchResultPageContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page\content;
 use wcf\data\search\ISearchResultObject;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/page/content/SearchResultPageContentList.class.php b/wcfsetup/install/files/lib/data/page/content/SearchResultPageContentList.class.php
index 299a842d7f..37fff2c3ff 100644
--- a/wcfsetup/install/files/lib/data/page/content/SearchResultPageContentList.class.php
+++ b/wcfsetup/install/files/lib/data/page/content/SearchResultPageContentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\page\content;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscription.class.php b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscription.class.php
index b7400dddaa..db85cac17c 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscription.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscription.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionAction.class.php b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionAction.class.php
index 7db6f64c68..e5cfdd1c5f 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionEditor.class.php b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionEditor.class.php
index b845066b1b..f103f24660 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionList.class.php b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionList.class.php
index c581841295..fc3e136654 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionList.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/PaidSubscriptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLog.class.php b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLog.class.php
index b33a555f48..40d971d3b8 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLog.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLog.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\transaction\log;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\paid\subscription\PaidSubscription;
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogAction.class.php b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogAction.class.php
index 931122d8d9..2eedc47cd2 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogAction.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\transaction\log;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogEditor.class.php b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogEditor.class.php
index 4eb260616a..e9dd029835 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogEditor.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\transaction\log;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogList.class.php b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogList.class.php
index 2ec1569608..97b02fe584 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogList.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/transaction/log/PaidSubscriptionTransactionLogList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\transaction\log;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUser.class.php b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUser.class.php
index d1f15ca2ea..b2d4e24139 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUser.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\user;
 use wcf\data\paid\subscription\PaidSubscription;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserAction.class.php b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserAction.class.php
index 90cab722ab..3f787c770a 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserAction.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\user;
 use wcf\data\paid\subscription\PaidSubscription;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserEditor.class.php b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserEditor.class.php
index 1e3e520ad3..afb5c4066e 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserEditor.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\user;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserList.class.php b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserList.class.php
index 274a3ad08c..1acf9f4e44 100644
--- a/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserList.class.php
+++ b/wcfsetup/install/files/lib/data/paid/subscription/user/PaidSubscriptionUserList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\paid\subscription\user;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/poll/Poll.class.php b/wcfsetup/install/files/lib/data/poll/Poll.class.php
index 8d3f197a1a..86d8f5ea07 100644
--- a/wcfsetup/install/files/lib/data/poll/Poll.class.php
+++ b/wcfsetup/install/files/lib/data/poll/Poll.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll;
 use wcf\data\poll\option\PollOption;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/poll/PollAction.class.php b/wcfsetup/install/files/lib/data/poll/PollAction.class.php
index 8e2b8eb17b..4cecfc222d 100644
--- a/wcfsetup/install/files/lib/data/poll/PollAction.class.php
+++ b/wcfsetup/install/files/lib/data/poll/PollAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\poll\option\PollOptionEditor;
diff --git a/wcfsetup/install/files/lib/data/poll/PollEditor.class.php b/wcfsetup/install/files/lib/data/poll/PollEditor.class.php
index 1c9970d3dc..fcdccd438e 100644
--- a/wcfsetup/install/files/lib/data/poll/PollEditor.class.php
+++ b/wcfsetup/install/files/lib/data/poll/PollEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/poll/PollList.class.php b/wcfsetup/install/files/lib/data/poll/PollList.class.php
index a513ba5452..986a6c1067 100644
--- a/wcfsetup/install/files/lib/data/poll/PollList.class.php
+++ b/wcfsetup/install/files/lib/data/poll/PollList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/poll/option/PollOption.class.php b/wcfsetup/install/files/lib/data/poll/option/PollOption.class.php
index fd559d77b7..f1f549956a 100644
--- a/wcfsetup/install/files/lib/data/poll/option/PollOption.class.php
+++ b/wcfsetup/install/files/lib/data/poll/option/PollOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll\option;
 use wcf\data\poll\Poll;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/poll/option/PollOptionAction.class.php b/wcfsetup/install/files/lib/data/poll/option/PollOptionAction.class.php
index f4c8bfa6f2..0e2ee98fc2 100644
--- a/wcfsetup/install/files/lib/data/poll/option/PollOptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/poll/option/PollOptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll\option;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/poll/option/PollOptionEditor.class.php b/wcfsetup/install/files/lib/data/poll/option/PollOptionEditor.class.php
index a475f1c685..9bd03d5500 100644
--- a/wcfsetup/install/files/lib/data/poll/option/PollOptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/poll/option/PollOptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll\option;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/poll/option/PollOptionList.class.php b/wcfsetup/install/files/lib/data/poll/option/PollOptionList.class.php
index b31693f5fb..0ec68cbfd2 100644
--- a/wcfsetup/install/files/lib/data/poll/option/PollOptionList.class.php
+++ b/wcfsetup/install/files/lib/data/poll/option/PollOptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\poll\option;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/search/ISearchResultObject.class.php b/wcfsetup/install/files/lib/data/search/ISearchResultObject.class.php
index 4327775542..6f18d5e10c 100644
--- a/wcfsetup/install/files/lib/data/search/ISearchResultObject.class.php
+++ b/wcfsetup/install/files/lib/data/search/ISearchResultObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/search/Search.class.php b/wcfsetup/install/files/lib/data/search/Search.class.php
index 9211687ada..81731aac03 100644
--- a/wcfsetup/install/files/lib/data/search/Search.class.php
+++ b/wcfsetup/install/files/lib/data/search/Search.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/search/SearchAction.class.php b/wcfsetup/install/files/lib/data/search/SearchAction.class.php
index 1d17295170..36e77d2a5c 100644
--- a/wcfsetup/install/files/lib/data/search/SearchAction.class.php
+++ b/wcfsetup/install/files/lib/data/search/SearchAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/search/SearchEditor.class.php b/wcfsetup/install/files/lib/data/search/SearchEditor.class.php
index fdaa0c5529..18fa51f520 100644
--- a/wcfsetup/install/files/lib/data/search/SearchEditor.class.php
+++ b/wcfsetup/install/files/lib/data/search/SearchEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/search/SearchList.class.php b/wcfsetup/install/files/lib/data/search/SearchList.class.php
index 136aafc978..aa815440b1 100644
--- a/wcfsetup/install/files/lib/data/search/SearchList.class.php
+++ b/wcfsetup/install/files/lib/data/search/SearchList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/search/keyword/SearchKeyword.class.php b/wcfsetup/install/files/lib/data/search/keyword/SearchKeyword.class.php
index 9a5053c672..b797611314 100644
--- a/wcfsetup/install/files/lib/data/search/keyword/SearchKeyword.class.php
+++ b/wcfsetup/install/files/lib/data/search/keyword/SearchKeyword.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search\keyword;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordAction.class.php b/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordAction.class.php
index 9d96c61b68..c5cccd0efb 100644
--- a/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordAction.class.php
+++ b/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search\keyword;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISearchAction;
diff --git a/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordEditor.class.php b/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordEditor.class.php
index b911128180..e2ff205e93 100644
--- a/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordEditor.class.php
+++ b/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search\keyword;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordList.class.php b/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordList.class.php
index d16d060daa..07ca17342c 100644
--- a/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordList.class.php
+++ b/wcfsetup/install/files/lib/data/search/keyword/SearchKeywordList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\search\keyword;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/session/Session.class.php b/wcfsetup/install/files/lib/data/session/Session.class.php
index cb835add79..346499b099 100644
--- a/wcfsetup/install/files/lib/data/session/Session.class.php
+++ b/wcfsetup/install/files/lib/data/session/Session.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session;
 use wcf\data\acp\session\ACPSession;
 
diff --git a/wcfsetup/install/files/lib/data/session/SessionAction.class.php b/wcfsetup/install/files/lib/data/session/SessionAction.class.php
index 7604b5bf63..12735fde5d 100644
--- a/wcfsetup/install/files/lib/data/session/SessionAction.class.php
+++ b/wcfsetup/install/files/lib/data/session/SessionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/data/session/SessionEditor.class.php b/wcfsetup/install/files/lib/data/session/SessionEditor.class.php
index 68103740d0..f0404957e8 100644
--- a/wcfsetup/install/files/lib/data/session/SessionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/session/SessionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session;
 use wcf\data\acp\session\ACPSessionEditor;
 
diff --git a/wcfsetup/install/files/lib/data/session/SessionList.class.php b/wcfsetup/install/files/lib/data/session/SessionList.class.php
index b56b5877c9..d4c6887b13 100644
--- a/wcfsetup/install/files/lib/data/session/SessionList.class.php
+++ b/wcfsetup/install/files/lib/data/session/SessionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtual.class.php b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtual.class.php
index 32784c143b..f4d946e09a 100644
--- a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtual.class.php
+++ b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtual.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session\virtual;
 use wcf\data\acp\session\virtual\ACPSessionVirtual;
 
diff --git a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualAction.class.php b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualAction.class.php
index 8c9210c47e..1453320e22 100644
--- a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualAction.class.php
+++ b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session\virtual;
 use wcf\data\acp\session\virtual\ACPSessionVirtualAction;
 
diff --git a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualEditor.class.php b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualEditor.class.php
index 453905fd9c..3f0fcd95cb 100644
--- a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualEditor.class.php
+++ b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session\virtual;
 use wcf\data\acp\session\virtual\ACPSessionVirtualEditor;
 
diff --git a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualList.class.php b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualList.class.php
index 5b96f6db23..153407a3ab 100644
--- a/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualList.class.php
+++ b/wcfsetup/install/files/lib/data/session/virtual/SessionVirtualList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\session\virtual;
 use wcf\data\acp\session\virtual\ACPSessionVirtualList;
 
diff --git a/wcfsetup/install/files/lib/data/smiley/Smiley.class.php b/wcfsetup/install/files/lib/data/smiley/Smiley.class.php
index cd913afef2..a43899deb8 100644
--- a/wcfsetup/install/files/lib/data/smiley/Smiley.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/Smiley.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/smiley/SmileyAction.class.php b/wcfsetup/install/files/lib/data/smiley/SmileyAction.class.php
index a33db72134..01d23b292e 100644
--- a/wcfsetup/install/files/lib/data/smiley/SmileyAction.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/SmileyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISortableAction;
diff --git a/wcfsetup/install/files/lib/data/smiley/SmileyCache.class.php b/wcfsetup/install/files/lib/data/smiley/SmileyCache.class.php
index 02c96198d2..ad5fb1edd2 100644
--- a/wcfsetup/install/files/lib/data/smiley/SmileyCache.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/SmileyCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley;
 use wcf\data\category\Category;
 use wcf\data\smiley\category\SmileyCategory;
diff --git a/wcfsetup/install/files/lib/data/smiley/SmileyEditor.class.php b/wcfsetup/install/files/lib/data/smiley/SmileyEditor.class.php
index ba6d97d134..9ac2d67b1f 100644
--- a/wcfsetup/install/files/lib/data/smiley/SmileyEditor.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/SmileyEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/smiley/SmileyList.class.php b/wcfsetup/install/files/lib/data/smiley/SmileyList.class.php
index bc76db6750..8cf2c78bb6 100644
--- a/wcfsetup/install/files/lib/data/smiley/SmileyList.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/SmileyList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/smiley/category/SmileyCategory.class.php b/wcfsetup/install/files/lib/data/smiley/category/SmileyCategory.class.php
index 93fbd29e8e..10f5992e72 100644
--- a/wcfsetup/install/files/lib/data/smiley/category/SmileyCategory.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/category/SmileyCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley\category;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\data\smiley\Smiley;
diff --git a/wcfsetup/install/files/lib/data/smiley/category/SmileyCategoryAction.class.php b/wcfsetup/install/files/lib/data/smiley/category/SmileyCategoryAction.class.php
index a90b59bfa3..a83480b5ce 100644
--- a/wcfsetup/install/files/lib/data/smiley/category/SmileyCategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/smiley/category/SmileyCategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\smiley\category;
 use wcf\data\category\Category;
 use wcf\data\category\CategoryEditor;
diff --git a/wcfsetup/install/files/lib/data/spider/Spider.class.php b/wcfsetup/install/files/lib/data/spider/Spider.class.php
index 7b5bba7983..f25a4b71c2 100644
--- a/wcfsetup/install/files/lib/data/spider/Spider.class.php
+++ b/wcfsetup/install/files/lib/data/spider/Spider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\spider;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/spider/SpiderAction.class.php b/wcfsetup/install/files/lib/data/spider/SpiderAction.class.php
index 4986e47143..0ea07e5b00 100644
--- a/wcfsetup/install/files/lib/data/spider/SpiderAction.class.php
+++ b/wcfsetup/install/files/lib/data/spider/SpiderAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\spider;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/spider/SpiderEditor.class.php b/wcfsetup/install/files/lib/data/spider/SpiderEditor.class.php
index 3ce64230f9..94f9fb53ce 100644
--- a/wcfsetup/install/files/lib/data/spider/SpiderEditor.class.php
+++ b/wcfsetup/install/files/lib/data/spider/SpiderEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\spider;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/spider/SpiderList.class.php b/wcfsetup/install/files/lib/data/spider/SpiderList.class.php
index 8e7c50c0c6..176d989f3b 100644
--- a/wcfsetup/install/files/lib/data/spider/SpiderList.class.php
+++ b/wcfsetup/install/files/lib/data/spider/SpiderList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\spider;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/stat/daily/StatDaily.class.php b/wcfsetup/install/files/lib/data/stat/daily/StatDaily.class.php
index 81cede3a60..84adc6e450 100644
--- a/wcfsetup/install/files/lib/data/stat/daily/StatDaily.class.php
+++ b/wcfsetup/install/files/lib/data/stat/daily/StatDaily.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\stat\daily;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/stat/daily/StatDailyAction.class.php b/wcfsetup/install/files/lib/data/stat/daily/StatDailyAction.class.php
index 497b24c6e6..48232ad5b5 100644
--- a/wcfsetup/install/files/lib/data/stat/daily/StatDailyAction.class.php
+++ b/wcfsetup/install/files/lib/data/stat/daily/StatDailyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\stat\daily;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/stat/daily/StatDailyEditor.class.php b/wcfsetup/install/files/lib/data/stat/daily/StatDailyEditor.class.php
index e97257c245..d5961b70c1 100644
--- a/wcfsetup/install/files/lib/data/stat/daily/StatDailyEditor.class.php
+++ b/wcfsetup/install/files/lib/data/stat/daily/StatDailyEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\stat\daily;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/stat/daily/StatDailyList.class.php b/wcfsetup/install/files/lib/data/stat/daily/StatDailyList.class.php
index 81f3ac3fb5..cf7918e1ce 100644
--- a/wcfsetup/install/files/lib/data/stat/daily/StatDailyList.class.php
+++ b/wcfsetup/install/files/lib/data/stat/daily/StatDailyList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\stat\daily;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/style/ActiveStyle.class.php b/wcfsetup/install/files/lib/data/style/ActiveStyle.class.php
index 77f61f33f3..df651d5a59 100644
--- a/wcfsetup/install/files/lib/data/style/ActiveStyle.class.php
+++ b/wcfsetup/install/files/lib/data/style/ActiveStyle.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style;
 use wcf\data\DatabaseObjectDecorator;
 use wcf\system\request\RouteHandler;
diff --git a/wcfsetup/install/files/lib/data/style/Style.class.php b/wcfsetup/install/files/lib/data/style/Style.class.php
index 8880caa1f9..6acf173d64 100644
--- a/wcfsetup/install/files/lib/data/style/Style.class.php
+++ b/wcfsetup/install/files/lib/data/style/Style.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style;
 use wcf\data\DatabaseObject;
 use wcf\system\application\ApplicationHandler;
diff --git a/wcfsetup/install/files/lib/data/style/StyleAction.class.php b/wcfsetup/install/files/lib/data/style/StyleAction.class.php
index 9c6c1c1e27..7334ebd874 100644
--- a/wcfsetup/install/files/lib/data/style/StyleAction.class.php
+++ b/wcfsetup/install/files/lib/data/style/StyleAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style;
 use wcf\data\user\cover\photo\UserCoverPhoto;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/data/style/StyleEditor.class.php b/wcfsetup/install/files/lib/data/style/StyleEditor.class.php
index 36069197d8..7d7208e925 100644
--- a/wcfsetup/install/files/lib/data/style/StyleEditor.class.php
+++ b/wcfsetup/install/files/lib/data/style/StyleEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style;
 use wcf\data\language\category\LanguageCategory;
 use wcf\data\language\LanguageList;
diff --git a/wcfsetup/install/files/lib/data/style/StyleList.class.php b/wcfsetup/install/files/lib/data/style/StyleList.class.php
index c55cdfdb5a..dbf5cc9fa6 100644
--- a/wcfsetup/install/files/lib/data/style/StyleList.class.php
+++ b/wcfsetup/install/files/lib/data/style/StyleList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/style/variable/StyleVariable.class.php b/wcfsetup/install/files/lib/data/style/variable/StyleVariable.class.php
index 5380415f70..3f656394b3 100644
--- a/wcfsetup/install/files/lib/data/style/variable/StyleVariable.class.php
+++ b/wcfsetup/install/files/lib/data/style/variable/StyleVariable.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style\variable;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/style/variable/StyleVariableAction.class.php b/wcfsetup/install/files/lib/data/style/variable/StyleVariableAction.class.php
index 0125e32e86..c5d85ff6e8 100644
--- a/wcfsetup/install/files/lib/data/style/variable/StyleVariableAction.class.php
+++ b/wcfsetup/install/files/lib/data/style/variable/StyleVariableAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style\variable;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/style/variable/StyleVariableEditor.class.php b/wcfsetup/install/files/lib/data/style/variable/StyleVariableEditor.class.php
index 460bf76c86..22eac68690 100644
--- a/wcfsetup/install/files/lib/data/style/variable/StyleVariableEditor.class.php
+++ b/wcfsetup/install/files/lib/data/style/variable/StyleVariableEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style\variable;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/style/variable/StyleVariableList.class.php b/wcfsetup/install/files/lib/data/style/variable/StyleVariableList.class.php
index 915a86bb54..3a5d9a2d29 100644
--- a/wcfsetup/install/files/lib/data/style/variable/StyleVariableList.class.php
+++ b/wcfsetup/install/files/lib/data/style/variable/StyleVariableList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\style\variable;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/tag/Tag.class.php b/wcfsetup/install/files/lib/data/tag/Tag.class.php
index 052547b3f4..c424e9c4ee 100644
--- a/wcfsetup/install/files/lib/data/tag/Tag.class.php
+++ b/wcfsetup/install/files/lib/data/tag/Tag.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\tag;
 use wcf\data\DatabaseObject;
 use wcf\system\request\IRouteController;
diff --git a/wcfsetup/install/files/lib/data/tag/TagAction.class.php b/wcfsetup/install/files/lib/data/tag/TagAction.class.php
index 5bf326c9bd..4c3d55db98 100644
--- a/wcfsetup/install/files/lib/data/tag/TagAction.class.php
+++ b/wcfsetup/install/files/lib/data/tag/TagAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\tag;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISearchAction;
diff --git a/wcfsetup/install/files/lib/data/tag/TagCloudTag.class.php b/wcfsetup/install/files/lib/data/tag/TagCloudTag.class.php
index a8ed17c61f..0f6cc78979 100644
--- a/wcfsetup/install/files/lib/data/tag/TagCloudTag.class.php
+++ b/wcfsetup/install/files/lib/data/tag/TagCloudTag.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\tag;
 use wcf\data\DatabaseObjectDecorator;
 
diff --git a/wcfsetup/install/files/lib/data/tag/TagEditor.class.php b/wcfsetup/install/files/lib/data/tag/TagEditor.class.php
index bdb879d809..75f068495f 100644
--- a/wcfsetup/install/files/lib/data/tag/TagEditor.class.php
+++ b/wcfsetup/install/files/lib/data/tag/TagEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\tag;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/tag/TagList.class.php b/wcfsetup/install/files/lib/data/tag/TagList.class.php
index 413a4a6904..f015969a49 100644
--- a/wcfsetup/install/files/lib/data/tag/TagList.class.php
+++ b/wcfsetup/install/files/lib/data/tag/TagList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\tag;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/template/Template.class.php b/wcfsetup/install/files/lib/data/template/Template.class.php
index ce0bcc4e4b..cdeb703db5 100644
--- a/wcfsetup/install/files/lib/data/template/Template.class.php
+++ b/wcfsetup/install/files/lib/data/template/Template.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template;
 use wcf\data\package\PackageCache;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/template/TemplateAction.class.php b/wcfsetup/install/files/lib/data/template/TemplateAction.class.php
index 97b94f17d1..e1ed48764a 100644
--- a/wcfsetup/install/files/lib/data/template/TemplateAction.class.php
+++ b/wcfsetup/install/files/lib/data/template/TemplateAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\language\LanguageFactory;
diff --git a/wcfsetup/install/files/lib/data/template/TemplateEditor.class.php b/wcfsetup/install/files/lib/data/template/TemplateEditor.class.php
index 30501f7076..296458dee3 100644
--- a/wcfsetup/install/files/lib/data/template/TemplateEditor.class.php
+++ b/wcfsetup/install/files/lib/data/template/TemplateEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\io\File;
diff --git a/wcfsetup/install/files/lib/data/template/TemplateList.class.php b/wcfsetup/install/files/lib/data/template/TemplateList.class.php
index 2d08712a7b..a09531501e 100644
--- a/wcfsetup/install/files/lib/data/template/TemplateList.class.php
+++ b/wcfsetup/install/files/lib/data/template/TemplateList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template;
 use wcf\data\package\PackageCache;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/data/template/group/TemplateGroup.class.php b/wcfsetup/install/files/lib/data/template/group/TemplateGroup.class.php
index 68bc394340..9a0f7e78a0 100644
--- a/wcfsetup/install/files/lib/data/template/group/TemplateGroup.class.php
+++ b/wcfsetup/install/files/lib/data/template/group/TemplateGroup.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\group;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/template/group/TemplateGroupAction.class.php b/wcfsetup/install/files/lib/data/template/group/TemplateGroupAction.class.php
index d0070558fc..dec98db50e 100644
--- a/wcfsetup/install/files/lib/data/template/group/TemplateGroupAction.class.php
+++ b/wcfsetup/install/files/lib/data/template/group/TemplateGroupAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\group;
 use wcf\data\template\Template;
 use wcf\data\template\TemplateAction;
diff --git a/wcfsetup/install/files/lib/data/template/group/TemplateGroupEditor.class.php b/wcfsetup/install/files/lib/data/template/group/TemplateGroupEditor.class.php
index fe0601c4fd..4296b84847 100644
--- a/wcfsetup/install/files/lib/data/template/group/TemplateGroupEditor.class.php
+++ b/wcfsetup/install/files/lib/data/template/group/TemplateGroupEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\group;
 use wcf\data\package\PackageCache;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/template/group/TemplateGroupList.class.php b/wcfsetup/install/files/lib/data/template/group/TemplateGroupList.class.php
index 3da8270251..a55faced27 100644
--- a/wcfsetup/install/files/lib/data/template/group/TemplateGroupList.class.php
+++ b/wcfsetup/install/files/lib/data/template/group/TemplateGroupList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\group;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/template/listener/TemplateListener.class.php b/wcfsetup/install/files/lib/data/template/listener/TemplateListener.class.php
index 055467524e..37df60aa19 100644
--- a/wcfsetup/install/files/lib/data/template/listener/TemplateListener.class.php
+++ b/wcfsetup/install/files/lib/data/template/listener/TemplateListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\listener;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/template/listener/TemplateListenerAction.class.php b/wcfsetup/install/files/lib/data/template/listener/TemplateListenerAction.class.php
index 102b4be92e..8c0dc163dc 100644
--- a/wcfsetup/install/files/lib/data/template/listener/TemplateListenerAction.class.php
+++ b/wcfsetup/install/files/lib/data/template/listener/TemplateListenerAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\listener;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/template/listener/TemplateListenerEditor.class.php b/wcfsetup/install/files/lib/data/template/listener/TemplateListenerEditor.class.php
index c0e53285e4..57f1f13b07 100644
--- a/wcfsetup/install/files/lib/data/template/listener/TemplateListenerEditor.class.php
+++ b/wcfsetup/install/files/lib/data/template/listener/TemplateListenerEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\listener;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/template/listener/TemplateListenerList.class.php b/wcfsetup/install/files/lib/data/template/listener/TemplateListenerList.class.php
index 18743a3c2c..03057610d2 100644
--- a/wcfsetup/install/files/lib/data/template/listener/TemplateListenerList.class.php
+++ b/wcfsetup/install/files/lib/data/template/listener/TemplateListenerList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\template\listener;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/trophy/Trophy.class.php b/wcfsetup/install/files/lib/data/trophy/Trophy.class.php
index 2826f9d608..193d87ab90 100644
--- a/wcfsetup/install/files/lib/data/trophy/Trophy.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/Trophy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy;
 use wcf\data\condition\Condition;
 use wcf\data\trophy\category\TrophyCategory;
diff --git a/wcfsetup/install/files/lib/data/trophy/TrophyAction.class.php b/wcfsetup/install/files/lib/data/trophy/TrophyAction.class.php
index 107dd0efd5..8e5313e317 100644
--- a/wcfsetup/install/files/lib/data/trophy/TrophyAction.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/TrophyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy;
 use wcf\data\user\trophy\UserTrophyAction;
 use wcf\data\user\trophy\UserTrophyList;
diff --git a/wcfsetup/install/files/lib/data/trophy/TrophyCache.class.php b/wcfsetup/install/files/lib/data/trophy/TrophyCache.class.php
index b5792d0cf4..af89861aa9 100644
--- a/wcfsetup/install/files/lib/data/trophy/TrophyCache.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/TrophyCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy;
 use wcf\system\cache\builder\TrophyCacheBuilder;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/data/trophy/TrophyEditor.class.php b/wcfsetup/install/files/lib/data/trophy/TrophyEditor.class.php
index 879127e88e..2b939d3636 100644
--- a/wcfsetup/install/files/lib/data/trophy/TrophyEditor.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/TrophyEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/trophy/TrophyList.class.php b/wcfsetup/install/files/lib/data/trophy/TrophyList.class.php
index 510c83dab3..efd4f83f1e 100644
--- a/wcfsetup/install/files/lib/data/trophy/TrophyList.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/TrophyList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/trophy/category/TrophyCategory.class.php b/wcfsetup/install/files/lib/data/trophy/category/TrophyCategory.class.php
index 96e53baf67..c13a30187f 100644
--- a/wcfsetup/install/files/lib/data/trophy/category/TrophyCategory.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/category/TrophyCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy\category;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\data\trophy\Trophy;
diff --git a/wcfsetup/install/files/lib/data/trophy/category/TrophyCategoryCache.class.php b/wcfsetup/install/files/lib/data/trophy/category/TrophyCategoryCache.class.php
index 6f1908067a..fbc9a87cee 100644
--- a/wcfsetup/install/files/lib/data/trophy/category/TrophyCategoryCache.class.php
+++ b/wcfsetup/install/files/lib/data/trophy/category/TrophyCategoryCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\trophy\category;
 use wcf\system\cache\builder\CategoryCacheBuilder;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/data/user/TeamList.class.php b/wcfsetup/install/files/lib/data/user/TeamList.class.php
index 1237ef5500..21aa2f837e 100644
--- a/wcfsetup/install/files/lib/data/user/TeamList.class.php
+++ b/wcfsetup/install/files/lib/data/user/TeamList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\user\group\Team;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/data/user/User.class.php b/wcfsetup/install/files/lib/data/user/User.class.php
index 42b69252d7..9e93de2db0 100644
--- a/wcfsetup/install/files/lib/data/user/User.class.php
+++ b/wcfsetup/install/files/lib/data/user/User.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\language\Language;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/data/user/UserAction.class.php b/wcfsetup/install/files/lib/data/user/UserAction.class.php
index 5afa0f679d..3ebb27b4bd 100644
--- a/wcfsetup/install/files/lib/data/user/UserAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\user\avatar\UserAvatarAction;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/data/user/UserBirthdayAction.class.php b/wcfsetup/install/files/lib/data/user/UserBirthdayAction.class.php
index c3ee3481a7..756e401769 100644
--- a/wcfsetup/install/files/lib/data/user/UserBirthdayAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserBirthdayAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\IGroupedUserListAction;
diff --git a/wcfsetup/install/files/lib/data/user/UserContentAction.class.php b/wcfsetup/install/files/lib/data/user/UserContentAction.class.php
index 4c3a8ce4e3..bd5187faca 100644
--- a/wcfsetup/install/files/lib/data/user/UserContentAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserContentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\system\edit\EditHistoryManager;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/UserEditor.class.php b/wcfsetup/install/files/lib/data/user/UserEditor.class.php
index 45b29ff5cd..cec635cb27 100644
--- a/wcfsetup/install/files/lib/data/user/UserEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\user\group\UserGroup;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/user/UserList.class.php b/wcfsetup/install/files/lib/data/user/UserList.class.php
index e1f523d7d2..4f428e9b6b 100644
--- a/wcfsetup/install/files/lib/data/user/UserList.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/UserProfile.class.php b/wcfsetup/install/files/lib/data/user/UserProfile.class.php
index e093fc9aba..5a16050113 100644
--- a/wcfsetup/install/files/lib/data/user/UserProfile.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserProfile.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\trophy\Trophy;
 use wcf\data\trophy\TrophyCache;
diff --git a/wcfsetup/install/files/lib/data/user/UserProfileAction.class.php b/wcfsetup/install/files/lib/data/user/UserProfileAction.class.php
index 2ab198566f..c5d0db9b73 100644
--- a/wcfsetup/install/files/lib/data/user/UserProfileAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserProfileAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/data/user/UserProfileList.class.php b/wcfsetup/install/files/lib/data/user/UserProfileList.class.php
index 50534cef6f..480726e2e6 100644
--- a/wcfsetup/install/files/lib/data/user/UserProfileList.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserProfileList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/user/UserRegistrationAction.class.php b/wcfsetup/install/files/lib/data/user/UserRegistrationAction.class.php
index d42cdbe8f0..c74a473e9a 100644
--- a/wcfsetup/install/files/lib/data/user/UserRegistrationAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/UserRegistrationAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user;
 use wcf\util\UserRegistrationUtil;
 use wcf\util\UserUtil;
diff --git a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEvent.class.php b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEvent.class.php
index 559208ebe9..48c648720b 100644
--- a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\activity\event;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventAction.class.php b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventAction.class.php
index 8f98aa1f8e..43e4bb2f4a 100644
--- a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\activity\event;
 use wcf\data\box\Box;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventEditor.class.php b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventEditor.class.php
index e589499a65..faa96b51a6 100644
--- a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\activity\event;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventList.class.php b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventList.class.php
index 1ce8aefbf6..fbf0d7b5fc 100644
--- a/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventList.class.php
+++ b/wcfsetup/install/files/lib/data/user/activity/event/UserActivityEventList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\activity\event;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEvent.class.php b/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEvent.class.php
index 04322e480f..48c22b7536 100644
--- a/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\activity\event;
 use wcf\data\user\UserProfile;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEventList.class.php b/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEventList.class.php
index 0c88dc8fe6..0b68d957ba 100644
--- a/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEventList.class.php
+++ b/wcfsetup/install/files/lib/data/user/activity/event/ViewableUserActivityEventList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\activity\event;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 use wcf\system\language\LanguageFactory;
diff --git a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailure.class.php b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailure.class.php
index f86ec02413..14d5622021 100644
--- a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailure.class.php
+++ b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailure.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\authentication\failure;
 use wcf\data\DatabaseObject;
 use wcf\util\UserUtil;
diff --git a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureAction.class.php b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureAction.class.php
index ab3f364697..a24a58cf2a 100644
--- a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\authentication\failure;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureEditor.class.php b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureEditor.class.php
index 4805180c88..9a51bd559f 100644
--- a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\authentication\failure;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureList.class.php b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureList.class.php
index 0b08b26e67..b7e6d6efd2 100644
--- a/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureList.class.php
+++ b/wcfsetup/install/files/lib/data/user/authentication/failure/UserAuthenticationFailureList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\authentication\failure;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/avatar/DefaultAvatar.class.php b/wcfsetup/install/files/lib/data/user/avatar/DefaultAvatar.class.php
index 6d14c39746..61fac1bc85 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/DefaultAvatar.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/DefaultAvatar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/data/user/avatar/Gravatar.class.php b/wcfsetup/install/files/lib/data/user/avatar/Gravatar.class.php
index 2a0d7f748a..cb3b65d15f 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/Gravatar.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/Gravatar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 use wcf\system\exception\SystemException;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/data/user/avatar/IUserAvatar.class.php b/wcfsetup/install/files/lib/data/user/avatar/IUserAvatar.class.php
index 1c4ca23416..9543e6f831 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/IUserAvatar.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/IUserAvatar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/user/avatar/UserAvatar.class.php b/wcfsetup/install/files/lib/data/user/avatar/UserAvatar.class.php
index 87a3330f6b..208ef24a45 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/UserAvatar.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/UserAvatar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 use wcf\data\DatabaseObject;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/data/user/avatar/UserAvatarAction.class.php b/wcfsetup/install/files/lib/data/user/avatar/UserAvatarAction.class.php
index 862fa6a0cf..9aca2954d0 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/UserAvatarAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/UserAvatarAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 use wcf\data\user\User;
 use wcf\data\user\UserEditor;
diff --git a/wcfsetup/install/files/lib/data/user/avatar/UserAvatarEditor.class.php b/wcfsetup/install/files/lib/data/user/avatar/UserAvatarEditor.class.php
index df245a8714..f182d1efeb 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/UserAvatarEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/UserAvatarEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/avatar/UserAvatarList.class.php b/wcfsetup/install/files/lib/data/user/avatar/UserAvatarList.class.php
index a5de2d976a..551bc7a1ac 100644
--- a/wcfsetup/install/files/lib/data/user/avatar/UserAvatarList.class.php
+++ b/wcfsetup/install/files/lib/data/user/avatar/UserAvatarList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\avatar;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/cover/photo/DefaultUserCoverPhoto.class.php b/wcfsetup/install/files/lib/data/user/cover/photo/DefaultUserCoverPhoto.class.php
index 09f6e90db1..cec4848924 100644
--- a/wcfsetup/install/files/lib/data/user/cover/photo/DefaultUserCoverPhoto.class.php
+++ b/wcfsetup/install/files/lib/data/user/cover/photo/DefaultUserCoverPhoto.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\cover\photo;
 use wcf\system\style\StyleHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/cover/photo/IUserCoverPhoto.class.php b/wcfsetup/install/files/lib/data/user/cover/photo/IUserCoverPhoto.class.php
index 3687e069f3..f07fb7c964 100644
--- a/wcfsetup/install/files/lib/data/user/cover/photo/IUserCoverPhoto.class.php
+++ b/wcfsetup/install/files/lib/data/user/cover/photo/IUserCoverPhoto.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\cover\photo;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/user/cover/photo/UserCoverPhoto.class.php b/wcfsetup/install/files/lib/data/user/cover/photo/UserCoverPhoto.class.php
index 84b9df7259..0dc0054eae 100644
--- a/wcfsetup/install/files/lib/data/user/cover/photo/UserCoverPhoto.class.php
+++ b/wcfsetup/install/files/lib/data/user/cover/photo/UserCoverPhoto.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\cover\photo;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollow.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollow.class.php
index 1c3d4a5904..e903c79e66 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollow.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollow.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollowAction.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollowAction.class.php
index 23d51802db..019d11d00a 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollowAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollowAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 use wcf\data\user\UserProfile;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollowEditor.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollowEditor.class.php
index 53392b483a..fed8e949c4 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollowEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollowEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollowList.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollowList.class.php
index 12cc94b1c6..1e851df670 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollowList.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollowList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollowerList.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollowerList.class.php
index c60419ef7b..bbfab2638a 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollowerList.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollowerList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 use wcf\data\user\User;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollowingAction.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollowingAction.class.php
index b9c5d6a4f8..3a3e196040 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollowingAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollowingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/data/user/follow/UserFollowingList.class.php b/wcfsetup/install/files/lib/data/user/follow/UserFollowingList.class.php
index c30b344113..007f056797 100644
--- a/wcfsetup/install/files/lib/data/user/follow/UserFollowingList.class.php
+++ b/wcfsetup/install/files/lib/data/user/follow/UserFollowingList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\follow;
 
 /**
diff --git a/wcfsetup/install/files/lib/data/user/group/Team.class.php b/wcfsetup/install/files/lib/data/user/group/Team.class.php
index d07221ef01..c4a6a6c552 100644
--- a/wcfsetup/install/files/lib/data/user/group/Team.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/Team.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group;
 use wcf\data\user\UserProfile;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/user/group/UserGroup.class.php b/wcfsetup/install/files/lib/data/user/group/UserGroup.class.php
index 12bae413a8..385b12c2a7 100644
--- a/wcfsetup/install/files/lib/data/user/group/UserGroup.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/UserGroup.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group;
 use wcf\data\user\User;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/data/user/group/UserGroupAction.class.php b/wcfsetup/install/files/lib/data/user/group/UserGroupAction.class.php
index 8a2450fde5..fa42e22e25 100644
--- a/wcfsetup/install/files/lib/data/user/group/UserGroupAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/UserGroupAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\cache\CacheHandler;
diff --git a/wcfsetup/install/files/lib/data/user/group/UserGroupEditor.class.php b/wcfsetup/install/files/lib/data/user/group/UserGroupEditor.class.php
index 08d3922ed9..f48e9ba833 100644
--- a/wcfsetup/install/files/lib/data/user/group/UserGroupEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/UserGroupEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/user/group/UserGroupList.class.php b/wcfsetup/install/files/lib/data/user/group/UserGroupList.class.php
index 7f475fb9f1..a5bfcdb19d 100644
--- a/wcfsetup/install/files/lib/data/user/group/UserGroupList.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/UserGroupList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignment.class.php b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignment.class.php
index 4b54e46d62..640fdd0691 100644
--- a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignment.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignment.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\assignment;
 use wcf\data\condition\Condition;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentAction.class.php b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentAction.class.php
index e1c6c37969..203b30e595 100644
--- a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\assignment;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentEditor.class.php b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentEditor.class.php
index d4f3e1afba..5b4c930825 100644
--- a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\assignment;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentList.class.php b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentList.class.php
index b675be653c..5f5e632613 100644
--- a/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentList.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/assignment/UserGroupAssignmentList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\assignment;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOption.class.php b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOption.class.php
index da75589bcd..1120474161 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOption.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option;
 use wcf\data\option\Option;
 
diff --git a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionAction.class.php b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionAction.class.php
index 4dcfbf2441..de2d51e4d1 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option;
 use wcf\data\user\group\UserGroupEditor;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionEditor.class.php b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionEditor.class.php
index 9e41b6816b..7e5e38d785 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionList.class.php b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionList.class.php
index e910b83070..d098cb6a9b 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionList.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/UserGroupOptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategory.class.php b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategory.class.php
index 062c68a44f..1e4834f6f4 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategory.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option\category;
 use wcf\data\DatabaseObject;
 use wcf\data\TDatabaseObjectOptions;
diff --git a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryAction.class.php b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryAction.class.php
index 8f86b6c7b9..a580fef23e 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option\category;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryEditor.class.php b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryEditor.class.php
index 8ef416db9a..356ecccbd4 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option\category;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryList.class.php b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryList.class.php
index 35106d72c1..6d90bbbf44 100644
--- a/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryList.class.php
+++ b/wcfsetup/install/files/lib/data/user/group/option/category/UserGroupOptionCategoryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\group\option\category;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/ignore/UserIgnore.class.php b/wcfsetup/install/files/lib/data/user/ignore/UserIgnore.class.php
index 809d21d8af..971db943c8 100644
--- a/wcfsetup/install/files/lib/data/user/ignore/UserIgnore.class.php
+++ b/wcfsetup/install/files/lib/data/user/ignore/UserIgnore.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\ignore;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreAction.class.php b/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreAction.class.php
index eadd829cdf..ee6d33d975 100644
--- a/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\ignore;
 use wcf\data\user\follow\UserFollow;
 use wcf\data\user\follow\UserFollowEditor;
diff --git a/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreEditor.class.php b/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreEditor.class.php
index f811712a41..1d35e54c2d 100644
--- a/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\ignore;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreList.class.php b/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreList.class.php
index f2175eabaa..66c8e45655 100644
--- a/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreList.class.php
+++ b/wcfsetup/install/files/lib/data/user/ignore/UserIgnoreList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\ignore;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/ignore/ViewableUserIgnoreList.class.php b/wcfsetup/install/files/lib/data/user/ignore/ViewableUserIgnoreList.class.php
index 06f6ebf8b0..a8eff78bfa 100644
--- a/wcfsetup/install/files/lib/data/user/ignore/ViewableUserIgnoreList.class.php
+++ b/wcfsetup/install/files/lib/data/user/ignore/ViewableUserIgnoreList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\ignore;
 use wcf\data\user\User;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItem.class.php b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItem.class.php
index 8bcb6aa35e..980d673c0f 100644
--- a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItem.class.php
+++ b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\menu\item;
 use wcf\data\ProcessibleDatabaseObject;
 use wcf\system\menu\user\DefaultUserMenuItemProvider;
diff --git a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemAction.class.php b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemAction.class.php
index e251478c15..67f3960b52 100644
--- a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\menu\item;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemEditor.class.php b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemEditor.class.php
index af22e8810f..9584353983 100644
--- a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\menu\item;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemList.class.php b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemList.class.php
index 196d8337a6..b4278d5b3c 100644
--- a/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemList.class.php
+++ b/wcfsetup/install/files/lib/data/user/menu/item/UserMenuItemList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\menu\item;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/notification/UserNotification.class.php b/wcfsetup/install/files/lib/data/user/notification/UserNotification.class.php
index 5d0594a095..8161bb9234 100644
--- a/wcfsetup/install/files/lib/data/user/notification/UserNotification.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/UserNotification.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/notification/UserNotificationAction.class.php b/wcfsetup/install/files/lib/data/user/notification/UserNotificationAction.class.php
index b94d434893..b682b005f5 100644
--- a/wcfsetup/install/files/lib/data/user/notification/UserNotificationAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/UserNotificationAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/data/user/notification/UserNotificationEditor.class.php b/wcfsetup/install/files/lib/data/user/notification/UserNotificationEditor.class.php
index eaffa9d5fd..4e7282f81d 100644
--- a/wcfsetup/install/files/lib/data/user/notification/UserNotificationEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/UserNotificationEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification;
 use wcf\data\DatabaseObjectEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/notification/UserNotificationList.class.php b/wcfsetup/install/files/lib/data/user/notification/UserNotificationList.class.php
index 36757c55e2..b04a83691a 100644
--- a/wcfsetup/install/files/lib/data/user/notification/UserNotificationList.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/UserNotificationList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEvent.class.php b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEvent.class.php
index 0528f4feb5..9974ddbeee 100644
--- a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification\event;
 use wcf\data\ProcessibleDatabaseObject;
 use wcf\data\TDatabaseObjectOptions;
diff --git a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventAction.class.php b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventAction.class.php
index 0fbe58d746..f706c40216 100644
--- a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification\event;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventEditor.class.php b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventEditor.class.php
index 3e681ad634..27c6ef3dfa 100644
--- a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification\event;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventList.class.php b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventList.class.php
index fe7f6efa7d..0244df7aa5 100644
--- a/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventList.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/event/UserNotificationEventList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification\event;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/notification/event/recipient/UserNotificationEventRecipientList.class.php b/wcfsetup/install/files/lib/data/user/notification/event/recipient/UserNotificationEventRecipientList.class.php
index 6dd49f35b4..b6caa33d70 100644
--- a/wcfsetup/install/files/lib/data/user/notification/event/recipient/UserNotificationEventRecipientList.class.php
+++ b/wcfsetup/install/files/lib/data/user/notification/event/recipient/UserNotificationEventRecipientList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\notification\event\recipient;
 use wcf\data\user\UserList;
 
diff --git a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatch.class.php b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatch.class.php
index fca9d0a330..a71b569144 100644
--- a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatch.class.php
+++ b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatch.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\object\watch;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchAction.class.php b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchAction.class.php
index af3169e7cd..186e9ebc49 100644
--- a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\object\watch;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchEditor.class.php b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchEditor.class.php
index d51ff7aa4c..aaadd1cb2d 100644
--- a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\object\watch;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchList.class.php b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchList.class.php
index e818e1d860..17cc77bee9 100644
--- a/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchList.class.php
+++ b/wcfsetup/install/files/lib/data/user/object/watch/UserObjectWatchList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\object\watch;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/online/UserOnline.class.php b/wcfsetup/install/files/lib/data/user/online/UserOnline.class.php
index 43f6070f90..0309a53c9a 100644
--- a/wcfsetup/install/files/lib/data/user/online/UserOnline.class.php
+++ b/wcfsetup/install/files/lib/data/user/online/UserOnline.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\online;
 use wcf\data\page\PageCache;
 use wcf\data\spider\Spider;
diff --git a/wcfsetup/install/files/lib/data/user/online/UsersOnlineList.class.php b/wcfsetup/install/files/lib/data/user/online/UsersOnlineList.class.php
index 7fe52a682c..035c2c48b0 100644
--- a/wcfsetup/install/files/lib/data/user/online/UsersOnlineList.class.php
+++ b/wcfsetup/install/files/lib/data/user/online/UsersOnlineList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\online;
 use wcf\data\option\OptionAction;
 use wcf\data\session\SessionList;
diff --git a/wcfsetup/install/files/lib/data/user/option/UserOption.class.php b/wcfsetup/install/files/lib/data/user/option/UserOption.class.php
index 32fca93e99..692d541a6d 100644
--- a/wcfsetup/install/files/lib/data/user/option/UserOption.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/UserOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/data/user/option/UserOptionAction.class.php b/wcfsetup/install/files/lib/data/user/option/UserOptionAction.class.php
index a216c51a88..a2db8a787f 100644
--- a/wcfsetup/install/files/lib/data/user/option/UserOptionAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/UserOptionAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\IToggleAction;
diff --git a/wcfsetup/install/files/lib/data/user/option/UserOptionEditor.class.php b/wcfsetup/install/files/lib/data/user/option/UserOptionEditor.class.php
index daf266cb02..39434b6dd3 100644
--- a/wcfsetup/install/files/lib/data/user/option/UserOptionEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/UserOptionEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/user/option/UserOptionList.class.php b/wcfsetup/install/files/lib/data/user/option/UserOptionList.class.php
index 3dfeeb1ecc..33543ccfc1 100644
--- a/wcfsetup/install/files/lib/data/user/option/UserOptionList.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/UserOptionList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/option/ViewableUserOption.class.php b/wcfsetup/install/files/lib/data/user/option/ViewableUserOption.class.php
index 183d22f2d8..5e01792b61 100644
--- a/wcfsetup/install/files/lib/data/user/option/ViewableUserOption.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/ViewableUserOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option;
 use wcf\data\user\User;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategory.class.php b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategory.class.php
index 7910965bf6..334f58ce03 100644
--- a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategory.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option\category;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryAction.class.php b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryAction.class.php
index a8f2cc1b6b..2ff330474f 100644
--- a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option\category;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryEditor.class.php b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryEditor.class.php
index ffeb021c20..b7bbe090d0 100644
--- a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option\category;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryList.class.php b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryList.class.php
index 22224254c5..e488bf276d 100644
--- a/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryList.class.php
+++ b/wcfsetup/install/files/lib/data/user/option/category/UserOptionCategoryList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\option\category;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItem.class.php b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItem.class.php
index d6b96fc155..eaa67307d6 100644
--- a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItem.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\menu\item;
 use wcf\system\exception\ImplementationException;
 use wcf\system\exception\ParentClassException;
diff --git a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemAction.class.php b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemAction.class.php
index 0be90d4010..0f922236d7 100644
--- a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\menu\item;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\ISortableAction;
diff --git a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemEditor.class.php b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemEditor.class.php
index 3e2e889a03..23e12ae86a 100644
--- a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\menu\item;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemList.class.php b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemList.class.php
index 5f75b41f77..c6bc122dcb 100644
--- a/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemList.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/menu/item/UserProfileMenuItemList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\menu\item;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitor.class.php b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitor.class.php
index 9a8e20f58f..a352de9e18 100644
--- a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitor.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\visitor;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorAction.class.php b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorAction.class.php
index d0b2849509..4e02c5a15a 100644
--- a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\visitor;
 use wcf\data\user\UserProfile;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorEditor.class.php b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorEditor.class.php
index 9554d39459..21b46f5994 100644
--- a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\visitor;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorList.class.php b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorList.class.php
index e16587c34d..718e7ef2de 100644
--- a/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorList.class.php
+++ b/wcfsetup/install/files/lib/data/user/profile/visitor/UserProfileVisitorList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\profile\visitor;
 use wcf\data\user\User;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/data/user/rank/UserRank.class.php b/wcfsetup/install/files/lib/data/user/rank/UserRank.class.php
index 88c24ee828..46b23701b9 100644
--- a/wcfsetup/install/files/lib/data/user/rank/UserRank.class.php
+++ b/wcfsetup/install/files/lib/data/user/rank/UserRank.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\rank;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/data/user/rank/UserRankAction.class.php b/wcfsetup/install/files/lib/data/user/rank/UserRankAction.class.php
index c43b7b2a13..54a686d270 100644
--- a/wcfsetup/install/files/lib/data/user/rank/UserRankAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/rank/UserRankAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\rank;
 use wcf\data\AbstractDatabaseObjectAction;
 
diff --git a/wcfsetup/install/files/lib/data/user/rank/UserRankEditor.class.php b/wcfsetup/install/files/lib/data/user/rank/UserRankEditor.class.php
index 34fe8cada0..54d7e6d3df 100644
--- a/wcfsetup/install/files/lib/data/user/rank/UserRankEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/rank/UserRankEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\rank;
 use wcf\data\DatabaseObjectEditor;
 use wcf\data\IEditableCachedObject;
diff --git a/wcfsetup/install/files/lib/data/user/rank/UserRankList.class.php b/wcfsetup/install/files/lib/data/user/rank/UserRankList.class.php
index e3be91a942..27fd777f79 100644
--- a/wcfsetup/install/files/lib/data/user/rank/UserRankList.class.php
+++ b/wcfsetup/install/files/lib/data/user/rank/UserRankList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\rank;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/data/user/trophy/UserTrophy.class.php b/wcfsetup/install/files/lib/data/user/trophy/UserTrophy.class.php
index 6dd3ef9325..abb18b4085 100644
--- a/wcfsetup/install/files/lib/data/user/trophy/UserTrophy.class.php
+++ b/wcfsetup/install/files/lib/data/user/trophy/UserTrophy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\trophy;
 use wcf\data\trophy\Trophy;
 use wcf\data\trophy\TrophyCache;
diff --git a/wcfsetup/install/files/lib/data/user/trophy/UserTrophyAction.class.php b/wcfsetup/install/files/lib/data/user/trophy/UserTrophyAction.class.php
index c8dc7ab6db..5110fce318 100644
--- a/wcfsetup/install/files/lib/data/user/trophy/UserTrophyAction.class.php
+++ b/wcfsetup/install/files/lib/data/user/trophy/UserTrophyAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\trophy;
 use wcf\data\user\UserAction;
 use wcf\data\AbstractDatabaseObjectAction;
diff --git a/wcfsetup/install/files/lib/data/user/trophy/UserTrophyEditor.class.php b/wcfsetup/install/files/lib/data/user/trophy/UserTrophyEditor.class.php
index 798c4fd9e9..a05f6f2ce9 100644
--- a/wcfsetup/install/files/lib/data/user/trophy/UserTrophyEditor.class.php
+++ b/wcfsetup/install/files/lib/data/user/trophy/UserTrophyEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\trophy;
 use wcf\data\DatabaseObjectEditor;
 
diff --git a/wcfsetup/install/files/lib/data/user/trophy/UserTrophyList.class.php b/wcfsetup/install/files/lib/data/user/trophy/UserTrophyList.class.php
index 074ad845eb..a424483ca0 100644
--- a/wcfsetup/install/files/lib/data/user/trophy/UserTrophyList.class.php
+++ b/wcfsetup/install/files/lib/data/user/trophy/UserTrophyList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\data\user\trophy;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/form/AbstractCaptchaForm.class.php b/wcfsetup/install/files/lib/form/AbstractCaptchaForm.class.php
index b72298baa4..9180bbc5f2 100644
--- a/wcfsetup/install/files/lib/form/AbstractCaptchaForm.class.php
+++ b/wcfsetup/install/files/lib/form/AbstractCaptchaForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\system\captcha\CaptchaHandler;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/form/AbstractForm.class.php b/wcfsetup/install/files/lib/form/AbstractForm.class.php
index 1a9d5c2288..b21d28555a 100644
--- a/wcfsetup/install/files/lib/form/AbstractForm.class.php
+++ b/wcfsetup/install/files/lib/form/AbstractForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\page\AbstractPage;
diff --git a/wcfsetup/install/files/lib/form/AbstractModerationForm.class.php b/wcfsetup/install/files/lib/form/AbstractModerationForm.class.php
index bb90633dcf..f3d852aff8 100644
--- a/wcfsetup/install/files/lib/form/AbstractModerationForm.class.php
+++ b/wcfsetup/install/files/lib/form/AbstractModerationForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\comment\StructuredCommentList;
 use wcf\data\moderation\queue\ModerationQueueAction;
diff --git a/wcfsetup/install/files/lib/form/AccountManagementForm.class.php b/wcfsetup/install/files/lib/form/AccountManagementForm.class.php
index 8eae39cc9b..b02090c27f 100644
--- a/wcfsetup/install/files/lib/form/AccountManagementForm.class.php
+++ b/wcfsetup/install/files/lib/form/AccountManagementForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/AvatarEditForm.class.php b/wcfsetup/install/files/lib/form/AvatarEditForm.class.php
index f03ba8b0e3..296975230c 100644
--- a/wcfsetup/install/files/lib/form/AvatarEditForm.class.php
+++ b/wcfsetup/install/files/lib/form/AvatarEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\avatar\Gravatar;
 use wcf\data\user\avatar\UserAvatarAction;
diff --git a/wcfsetup/install/files/lib/form/ContactForm.class.php b/wcfsetup/install/files/lib/form/ContactForm.class.php
index 5e2c380f71..355927fd84 100644
--- a/wcfsetup/install/files/lib/form/ContactForm.class.php
+++ b/wcfsetup/install/files/lib/form/ContactForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\contact\option\ContactOptionAction;
 use wcf\data\contact\recipient\ContactRecipientList;
diff --git a/wcfsetup/install/files/lib/form/DisclaimerForm.class.php b/wcfsetup/install/files/lib/form/DisclaimerForm.class.php
index 9e7360cbf8..53a01d53ee 100644
--- a/wcfsetup/install/files/lib/form/DisclaimerForm.class.php
+++ b/wcfsetup/install/files/lib/form/DisclaimerForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\system\exception\NamedUserException;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/form/EmailActivationForm.class.php b/wcfsetup/install/files/lib/form/EmailActivationForm.class.php
index 31d29245c4..45e8d6ab7e 100644
--- a/wcfsetup/install/files/lib/form/EmailActivationForm.class.php
+++ b/wcfsetup/install/files/lib/form/EmailActivationForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/EmailNewActivationCodeForm.class.php b/wcfsetup/install/files/lib/form/EmailNewActivationCodeForm.class.php
index 90830fd181..84571fbf77 100644
--- a/wcfsetup/install/files/lib/form/EmailNewActivationCodeForm.class.php
+++ b/wcfsetup/install/files/lib/form/EmailNewActivationCodeForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/IForm.class.php b/wcfsetup/install/files/lib/form/IForm.class.php
index 943fe95d8b..a5e51880ac 100644
--- a/wcfsetup/install/files/lib/form/IForm.class.php
+++ b/wcfsetup/install/files/lib/form/IForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\page\IPage;
 
diff --git a/wcfsetup/install/files/lib/form/LoginForm.class.php b/wcfsetup/install/files/lib/form/LoginForm.class.php
index b66e6e5347..d719034c1e 100644
--- a/wcfsetup/install/files/lib/form/LoginForm.class.php
+++ b/wcfsetup/install/files/lib/form/LoginForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\system\request\LinkHandler;
 use wcf\system\user\authentication\UserAuthenticationFactory;
diff --git a/wcfsetup/install/files/lib/form/LostPasswordForm.class.php b/wcfsetup/install/files/lib/form/LostPasswordForm.class.php
index d280192853..c73d837f7f 100644
--- a/wcfsetup/install/files/lib/form/LostPasswordForm.class.php
+++ b/wcfsetup/install/files/lib/form/LostPasswordForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/MailForm.class.php b/wcfsetup/install/files/lib/form/MailForm.class.php
index 346155e030..5c427e76e6 100644
--- a/wcfsetup/install/files/lib/form/MailForm.class.php
+++ b/wcfsetup/install/files/lib/form/MailForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\UserProfile;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/form/MessageForm.class.php b/wcfsetup/install/files/lib/form/MessageForm.class.php
index 668af87ab6..731c1e77c0 100644
--- a/wcfsetup/install/files/lib/form/MessageForm.class.php
+++ b/wcfsetup/install/files/lib/form/MessageForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\language\Language;
 use wcf\data\smiley\category\SmileyCategory;
diff --git a/wcfsetup/install/files/lib/form/ModerationActivationForm.class.php b/wcfsetup/install/files/lib/form/ModerationActivationForm.class.php
index 1ea51f46f2..778e2c9fef 100644
--- a/wcfsetup/install/files/lib/form/ModerationActivationForm.class.php
+++ b/wcfsetup/install/files/lib/form/ModerationActivationForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\system\exception\IllegalLinkException;
 use wcf\system\moderation\queue\activation\IModerationQueueActivationHandler;
diff --git a/wcfsetup/install/files/lib/form/ModerationReportForm.class.php b/wcfsetup/install/files/lib/form/ModerationReportForm.class.php
index a95e47e927..acfc97f0d2 100644
--- a/wcfsetup/install/files/lib/form/ModerationReportForm.class.php
+++ b/wcfsetup/install/files/lib/form/ModerationReportForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/form/NewPasswordForm.class.php b/wcfsetup/install/files/lib/form/NewPasswordForm.class.php
index c31aa9361a..5ff3110e7f 100644
--- a/wcfsetup/install/files/lib/form/NewPasswordForm.class.php
+++ b/wcfsetup/install/files/lib/form/NewPasswordForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/NotificationSettingsForm.class.php b/wcfsetup/install/files/lib/form/NotificationSettingsForm.class.php
index ee527e5b56..3191a63c2f 100644
--- a/wcfsetup/install/files/lib/form/NotificationSettingsForm.class.php
+++ b/wcfsetup/install/files/lib/form/NotificationSettingsForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/form/RecaptchaForm.class.php b/wcfsetup/install/files/lib/form/RecaptchaForm.class.php
index c661914dbd..5c30de9e15 100644
--- a/wcfsetup/install/files/lib/form/RecaptchaForm.class.php
+++ b/wcfsetup/install/files/lib/form/RecaptchaForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\system\recaptcha\RecaptchaHandler;
 use wcf\system\recaptcha\RecaptchaHandlerV2;
diff --git a/wcfsetup/install/files/lib/form/RegisterActivationForm.class.php b/wcfsetup/install/files/lib/form/RegisterActivationForm.class.php
index 69bde52ead..bd2df70cc2 100644
--- a/wcfsetup/install/files/lib/form/RegisterActivationForm.class.php
+++ b/wcfsetup/install/files/lib/form/RegisterActivationForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/RegisterForm.class.php b/wcfsetup/install/files/lib/form/RegisterForm.class.php
index 1d011a1043..be94fda47f 100644
--- a/wcfsetup/install/files/lib/form/RegisterForm.class.php
+++ b/wcfsetup/install/files/lib/form/RegisterForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\acp\form\UserAddForm;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/form/RegisterNewActivationCodeForm.class.php b/wcfsetup/install/files/lib/form/RegisterNewActivationCodeForm.class.php
index 1564846622..5529d6be7d 100644
--- a/wcfsetup/install/files/lib/form/RegisterNewActivationCodeForm.class.php
+++ b/wcfsetup/install/files/lib/form/RegisterNewActivationCodeForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/SearchForm.class.php b/wcfsetup/install/files/lib/form/SearchForm.class.php
index 8bb51aa6bf..9697770563 100644
--- a/wcfsetup/install/files/lib/form/SearchForm.class.php
+++ b/wcfsetup/install/files/lib/form/SearchForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\search\Search;
 use wcf\data\search\SearchAction;
diff --git a/wcfsetup/install/files/lib/form/SettingsForm.class.php b/wcfsetup/install/files/lib/form/SettingsForm.class.php
index 9aa9b65971..a334eb4096 100644
--- a/wcfsetup/install/files/lib/form/SettingsForm.class.php
+++ b/wcfsetup/install/files/lib/form/SettingsForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\language\Language;
 use wcf\data\style\Style;
diff --git a/wcfsetup/install/files/lib/form/SignatureEditForm.class.php b/wcfsetup/install/files/lib/form/SignatureEditForm.class.php
index dc95197227..1d1f466fdb 100644
--- a/wcfsetup/install/files/lib/form/SignatureEditForm.class.php
+++ b/wcfsetup/install/files/lib/form/SignatureEditForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/form/UserSearchForm.class.php b/wcfsetup/install/files/lib/form/UserSearchForm.class.php
index 82057d44c2..8f499b37bb 100644
--- a/wcfsetup/install/files/lib/form/UserSearchForm.class.php
+++ b/wcfsetup/install/files/lib/form/UserSearchForm.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\form;
 use wcf\acp\form\UserOptionListForm;
 use wcf\data\search\SearchEditor;
diff --git a/wcfsetup/install/files/lib/page/AbstractArticlePage.class.php b/wcfsetup/install/files/lib/page/AbstractArticlePage.class.php
index eac31b84ca..637f28afba 100644
--- a/wcfsetup/install/files/lib/page/AbstractArticlePage.class.php
+++ b/wcfsetup/install/files/lib/page/AbstractArticlePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\content\ViewableArticleContent;
diff --git a/wcfsetup/install/files/lib/page/AbstractAuthedPage.class.php b/wcfsetup/install/files/lib/page/AbstractAuthedPage.class.php
index 32ca6ac925..c49148789a 100644
--- a/wcfsetup/install/files/lib/page/AbstractAuthedPage.class.php
+++ b/wcfsetup/install/files/lib/page/AbstractAuthedPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\user\User;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/page/AbstractFeedPage.class.php b/wcfsetup/install/files/lib/page/AbstractFeedPage.class.php
index 15a8d66167..23a1e44e5d 100644
--- a/wcfsetup/install/files/lib/page/AbstractFeedPage.class.php
+++ b/wcfsetup/install/files/lib/page/AbstractFeedPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\system\WCF;
 use wcf\util\ArrayUtil;
diff --git a/wcfsetup/install/files/lib/page/AbstractPage.class.php b/wcfsetup/install/files/lib/page/AbstractPage.class.php
index b361ca71e5..b9ee46cac9 100644
--- a/wcfsetup/install/files/lib/page/AbstractPage.class.php
+++ b/wcfsetup/install/files/lib/page/AbstractPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\form\DisclaimerForm;
 use wcf\form\EmailActivationForm;
diff --git a/wcfsetup/install/files/lib/page/AbstractSecurePage.class.php b/wcfsetup/install/files/lib/page/AbstractSecurePage.class.php
index 4232e59339..98528f92b4 100644
--- a/wcfsetup/install/files/lib/page/AbstractSecurePage.class.php
+++ b/wcfsetup/install/files/lib/page/AbstractSecurePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\system\exception\IllegalLinkException;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/page/ArticleAmpPage.class.php b/wcfsetup/install/files/lib/page/ArticleAmpPage.class.php
index de8158ecb6..ec4c9dffaa 100644
--- a/wcfsetup/install/files/lib/page/ArticleAmpPage.class.php
+++ b/wcfsetup/install/files/lib/page/ArticleAmpPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\article\CategoryArticleList;
 use wcf\data\article\ViewableArticle;
diff --git a/wcfsetup/install/files/lib/page/ArticleFeedPage.class.php b/wcfsetup/install/files/lib/page/ArticleFeedPage.class.php
index ec84c6da32..f17c3df4ab 100644
--- a/wcfsetup/install/files/lib/page/ArticleFeedPage.class.php
+++ b/wcfsetup/install/files/lib/page/ArticleFeedPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\FeedArticleList;
diff --git a/wcfsetup/install/files/lib/page/ArticleListPage.class.php b/wcfsetup/install/files/lib/page/ArticleListPage.class.php
index f72b421f5d..957efab969 100644
--- a/wcfsetup/install/files/lib/page/ArticleListPage.class.php
+++ b/wcfsetup/install/files/lib/page/ArticleListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\AccessibleArticleList;
diff --git a/wcfsetup/install/files/lib/page/ArticlePage.class.php b/wcfsetup/install/files/lib/page/ArticlePage.class.php
index f2c6d1e14b..7cc12aa6e9 100644
--- a/wcfsetup/install/files/lib/page/ArticlePage.class.php
+++ b/wcfsetup/install/files/lib/page/ArticlePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\article\CategoryArticleList;
 use wcf\data\article\ViewableArticle;
diff --git a/wcfsetup/install/files/lib/page/AttachmentPage.class.php b/wcfsetup/install/files/lib/page/AttachmentPage.class.php
index da7e26c8e7..a993a0d9da 100644
--- a/wcfsetup/install/files/lib/page/AttachmentPage.class.php
+++ b/wcfsetup/install/files/lib/page/AttachmentPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\attachment\Attachment;
 use wcf\data\attachment\AttachmentEditor;
diff --git a/wcfsetup/install/files/lib/page/CategoryArticleListPage.class.php b/wcfsetup/install/files/lib/page/CategoryArticleListPage.class.php
index 17bd904ddb..2bb0b7c656 100644
--- a/wcfsetup/install/files/lib/page/CategoryArticleListPage.class.php
+++ b/wcfsetup/install/files/lib/page/CategoryArticleListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\CategoryArticleList;
diff --git a/wcfsetup/install/files/lib/page/CmsPage.class.php b/wcfsetup/install/files/lib/page/CmsPage.class.php
index 553b222c05..54ded18eac 100644
--- a/wcfsetup/install/files/lib/page/CmsPage.class.php
+++ b/wcfsetup/install/files/lib/page/CmsPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\page\content\PageContent;
 use wcf\data\page\Page;
diff --git a/wcfsetup/install/files/lib/page/DeletedContentListPage.class.php b/wcfsetup/install/files/lib/page/DeletedContentListPage.class.php
index 52198f7334..24ba4c0157 100644
--- a/wcfsetup/install/files/lib/page/DeletedContentListPage.class.php
+++ b/wcfsetup/install/files/lib/page/DeletedContentListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/page/EditHistoryPage.class.php b/wcfsetup/install/files/lib/page/EditHistoryPage.class.php
index 8e704b8adf..cde12a4bb1 100644
--- a/wcfsetup/install/files/lib/page/EditHistoryPage.class.php
+++ b/wcfsetup/install/files/lib/page/EditHistoryPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\edit\history\entry\EditHistoryEntry;
 use wcf\data\edit\history\entry\EditHistoryEntryList;
diff --git a/wcfsetup/install/files/lib/page/FollowingPage.class.php b/wcfsetup/install/files/lib/page/FollowingPage.class.php
index 6097b5a5e0..86d7904f2a 100644
--- a/wcfsetup/install/files/lib/page/FollowingPage.class.php
+++ b/wcfsetup/install/files/lib/page/FollowingPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\user\follow\UserFollowingList;
 use wcf\system\menu\user\UserMenu;
diff --git a/wcfsetup/install/files/lib/page/IPage.class.php b/wcfsetup/install/files/lib/page/IPage.class.php
index 0655c3b3bc..605c98b4a1 100644
--- a/wcfsetup/install/files/lib/page/IPage.class.php
+++ b/wcfsetup/install/files/lib/page/IPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/page/ITrackablePage.class.php b/wcfsetup/install/files/lib/page/ITrackablePage.class.php
index f70d4a9822..76f2a00196 100644
--- a/wcfsetup/install/files/lib/page/ITrackablePage.class.php
+++ b/wcfsetup/install/files/lib/page/ITrackablePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 
 /**
diff --git a/wcfsetup/install/files/lib/page/IgnoredUsersPage.class.php b/wcfsetup/install/files/lib/page/IgnoredUsersPage.class.php
index 036593a183..188545e361 100644
--- a/wcfsetup/install/files/lib/page/IgnoredUsersPage.class.php
+++ b/wcfsetup/install/files/lib/page/IgnoredUsersPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\user\ignore\ViewableUserIgnoreList;
 use wcf\system\menu\user\UserMenu;
diff --git a/wcfsetup/install/files/lib/page/MediaPage.class.php b/wcfsetup/install/files/lib/page/MediaPage.class.php
index fb75df8d0d..b27c46c8d3 100644
--- a/wcfsetup/install/files/lib/page/MediaPage.class.php
+++ b/wcfsetup/install/files/lib/page/MediaPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\media\Media;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/page/MembersListPage.class.php b/wcfsetup/install/files/lib/page/MembersListPage.class.php
index 8fbcdeef5b..2a3144ef00 100644
--- a/wcfsetup/install/files/lib/page/MembersListPage.class.php
+++ b/wcfsetup/install/files/lib/page/MembersListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\search\Search;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/page/ModerationListPage.class.php b/wcfsetup/install/files/lib/page/ModerationListPage.class.php
index 9104fbebd3..0bb9225793 100644
--- a/wcfsetup/install/files/lib/page/ModerationListPage.class.php
+++ b/wcfsetup/install/files/lib/page/ModerationListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ViewableModerationQueueList;
diff --git a/wcfsetup/install/files/lib/page/MultipleLinkPage.class.php b/wcfsetup/install/files/lib/page/MultipleLinkPage.class.php
index 45df8c3fdc..eec9db32ad 100644
--- a/wcfsetup/install/files/lib/page/MultipleLinkPage.class.php
+++ b/wcfsetup/install/files/lib/page/MultipleLinkPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\DatabaseObjectList;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/page/NotificationFeedPage.class.php b/wcfsetup/install/files/lib/page/NotificationFeedPage.class.php
index 782a26ef5c..ebcfc26c3f 100644
--- a/wcfsetup/install/files/lib/page/NotificationFeedPage.class.php
+++ b/wcfsetup/install/files/lib/page/NotificationFeedPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\system\exception\IllegalLinkException;
 use wcf\system\user\notification\UserNotificationHandler;
diff --git a/wcfsetup/install/files/lib/page/NotificationListPage.class.php b/wcfsetup/install/files/lib/page/NotificationListPage.class.php
index 1430e541bf..ecdfa27050 100644
--- a/wcfsetup/install/files/lib/page/NotificationListPage.class.php
+++ b/wcfsetup/install/files/lib/page/NotificationListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\system\menu\user\UserMenu;
 use wcf\system\user\notification\UserNotificationHandler;
diff --git a/wcfsetup/install/files/lib/page/PaidSubscriptionListPage.class.php b/wcfsetup/install/files/lib/page/PaidSubscriptionListPage.class.php
index 298981521c..de14d77e67 100644
--- a/wcfsetup/install/files/lib/page/PaidSubscriptionListPage.class.php
+++ b/wcfsetup/install/files/lib/page/PaidSubscriptionListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserList;
 use wcf\system\cache\builder\PaidSubscriptionCacheBuilder;
diff --git a/wcfsetup/install/files/lib/page/PaidSubscriptionReturnPage.class.php b/wcfsetup/install/files/lib/page/PaidSubscriptionReturnPage.class.php
index 0966e4a308..b4ed9ffe6c 100644
--- a/wcfsetup/install/files/lib/page/PaidSubscriptionReturnPage.class.php
+++ b/wcfsetup/install/files/lib/page/PaidSubscriptionReturnPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\system\request\LinkHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/page/RecentActivityListPage.class.php b/wcfsetup/install/files/lib/page/RecentActivityListPage.class.php
index 0317066f63..7c99e5ba3c 100644
--- a/wcfsetup/install/files/lib/page/RecentActivityListPage.class.php
+++ b/wcfsetup/install/files/lib/page/RecentActivityListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\user\activity\event\ViewableUserActivityEventList;
 use wcf\system\page\PageLocationManager;
diff --git a/wcfsetup/install/files/lib/page/SearchResultPage.class.php b/wcfsetup/install/files/lib/page/SearchResultPage.class.php
index d1fa1803e0..d492760ea1 100644
--- a/wcfsetup/install/files/lib/page/SearchResultPage.class.php
+++ b/wcfsetup/install/files/lib/page/SearchResultPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\search\ISearchResultObject;
 use wcf\data\search\Search;
diff --git a/wcfsetup/install/files/lib/page/SortablePage.class.php b/wcfsetup/install/files/lib/page/SortablePage.class.php
index 3c711266c0..e8fdd5865b 100644
--- a/wcfsetup/install/files/lib/page/SortablePage.class.php
+++ b/wcfsetup/install/files/lib/page/SortablePage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\system\event\EventHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/page/TaggedPage.class.php b/wcfsetup/install/files/lib/page/TaggedPage.class.php
index 828b3b9b63..184a51dfb5 100644
--- a/wcfsetup/install/files/lib/page/TaggedPage.class.php
+++ b/wcfsetup/install/files/lib/page/TaggedPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/page/TeamPage.class.php b/wcfsetup/install/files/lib/page/TeamPage.class.php
index 52178943f6..7b34e7b3a7 100644
--- a/wcfsetup/install/files/lib/page/TeamPage.class.php
+++ b/wcfsetup/install/files/lib/page/TeamPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\user\TeamList;
 use wcf\system\page\PageLocationManager;
diff --git a/wcfsetup/install/files/lib/page/TrophyListPage.class.php b/wcfsetup/install/files/lib/page/TrophyListPage.class.php
index fc66926596..85f723efe1 100644
--- a/wcfsetup/install/files/lib/page/TrophyListPage.class.php
+++ b/wcfsetup/install/files/lib/page/TrophyListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\trophy\category\TrophyCategory;
 use wcf\data\trophy\category\TrophyCategoryCache;
diff --git a/wcfsetup/install/files/lib/page/TrophyPage.class.php b/wcfsetup/install/files/lib/page/TrophyPage.class.php
index 4b533e02b9..a8f6ffabd1 100644
--- a/wcfsetup/install/files/lib/page/TrophyPage.class.php
+++ b/wcfsetup/install/files/lib/page/TrophyPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\trophy\Trophy;
 use wcf\data\trophy\TrophyCache;
diff --git a/wcfsetup/install/files/lib/page/UserPage.class.php b/wcfsetup/install/files/lib/page/UserPage.class.php
index 673553d4f2..90c76d7376 100644
--- a/wcfsetup/install/files/lib/page/UserPage.class.php
+++ b/wcfsetup/install/files/lib/page/UserPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/page/UsersOnlineListPage.class.php b/wcfsetup/install/files/lib/page/UsersOnlineListPage.class.php
index a5dfb401b2..2a164a1c59 100644
--- a/wcfsetup/install/files/lib/page/UsersOnlineListPage.class.php
+++ b/wcfsetup/install/files/lib/page/UsersOnlineListPage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\page;
 use wcf\data\page\PageCache;
 use wcf\data\user\online\UserOnline;
diff --git a/wcfsetup/install/files/lib/system/CLIWCF.class.php b/wcfsetup/install/files/lib/system/CLIWCF.class.php
index ef30c53b44..a31efa4aed 100644
--- a/wcfsetup/install/files/lib/system/CLIWCF.class.php
+++ b/wcfsetup/install/files/lib/system/CLIWCF.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use phpline\console\ConsoleReader;
 use phpline\internal\Log;
diff --git a/wcfsetup/install/files/lib/system/Callback.class.php b/wcfsetup/install/files/lib/system/Callback.class.php
index f439d6b9ad..edeb89fff2 100644
--- a/wcfsetup/install/files/lib/system/Callback.class.php
+++ b/wcfsetup/install/files/lib/system/Callback.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/IAJAXInvokeAction.class.php b/wcfsetup/install/files/lib/system/IAJAXInvokeAction.class.php
index d82c1a012b..811c4c72c2 100644
--- a/wcfsetup/install/files/lib/system/IAJAXInvokeAction.class.php
+++ b/wcfsetup/install/files/lib/system/IAJAXInvokeAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/MetaTagHandler.class.php b/wcfsetup/install/files/lib/system/MetaTagHandler.class.php
index 050c74b86d..73ab55524c 100644
--- a/wcfsetup/install/files/lib/system/MetaTagHandler.class.php
+++ b/wcfsetup/install/files/lib/system/MetaTagHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/Regex.class.php b/wcfsetup/install/files/lib/system/Regex.class.php
index f8abd4cdb2..5902d9725d 100644
--- a/wcfsetup/install/files/lib/system/Regex.class.php
+++ b/wcfsetup/install/files/lib/system/Regex.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/SingletonFactory.class.php b/wcfsetup/install/files/lib/system/SingletonFactory.class.php
index 4a2bd84288..01d89a9c15 100644
--- a/wcfsetup/install/files/lib/system/SingletonFactory.class.php
+++ b/wcfsetup/install/files/lib/system/SingletonFactory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/WCF.class.php b/wcfsetup/install/files/lib/system/WCF.class.php
index 9eee7a1e01..6ed96edb24 100644
--- a/wcfsetup/install/files/lib/system/WCF.class.php
+++ b/wcfsetup/install/files/lib/system/WCF.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\data\application\Application;
 use wcf\data\option\OptionEditor;
diff --git a/wcfsetup/install/files/lib/system/WCFACP.class.php b/wcfsetup/install/files/lib/system/WCFACP.class.php
index edf5ebb133..a9118067fa 100644
--- a/wcfsetup/install/files/lib/system/WCFACP.class.php
+++ b/wcfsetup/install/files/lib/system/WCFACP.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\acp\form\MasterPasswordForm;
 use wcf\acp\form\MasterPasswordInitForm;
diff --git a/wcfsetup/install/files/lib/system/WCFSetup.class.php b/wcfsetup/install/files/lib/system/WCFSetup.class.php
index 968b91c17e..5c0e189439 100644
--- a/wcfsetup/install/files/lib/system/WCFSetup.class.php
+++ b/wcfsetup/install/files/lib/system/WCFSetup.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system;
 use wcf\data\language\LanguageEditor;
 use wcf\data\language\SetupLanguage;
diff --git a/wcfsetup/install/files/lib/system/acl/ACLHandler.class.php b/wcfsetup/install/files/lib/system/acl/ACLHandler.class.php
index bc225d6a2b..cf8b8ca4da 100644
--- a/wcfsetup/install/files/lib/system/acl/ACLHandler.class.php
+++ b/wcfsetup/install/files/lib/system/acl/ACLHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\acl;
 use wcf\data\acl\option\category\ACLOptionCategory;
 use wcf\data\acl\option\category\ACLOptionCategoryList;
diff --git a/wcfsetup/install/files/lib/system/acl/simple/SimpleAclHandler.class.php b/wcfsetup/install/files/lib/system/acl/simple/SimpleAclHandler.class.php
index 835fa87f0e..8c8bbd8d78 100644
--- a/wcfsetup/install/files/lib/system/acl/simple/SimpleAclHandler.class.php
+++ b/wcfsetup/install/files/lib/system/acl/simple/SimpleAclHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\acl\simple;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/acl/simple/SimpleAclResolver.class.php b/wcfsetup/install/files/lib/system/acl/simple/SimpleAclResolver.class.php
index ae0df35934..cd9301b469 100644
--- a/wcfsetup/install/files/lib/system/acl/simple/SimpleAclResolver.class.php
+++ b/wcfsetup/install/files/lib/system/acl/simple/SimpleAclResolver.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\acl\simple;
 use wcf\data\user\User;
 use wcf\system\cache\builder\SimpleAclCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/ad/AdHandler.class.php b/wcfsetup/install/files/lib/system/ad/AdHandler.class.php
index 9228f9cd10..396bead445 100644
--- a/wcfsetup/install/files/lib/system/ad/AdHandler.class.php
+++ b/wcfsetup/install/files/lib/system/ad/AdHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\ad;
 use wcf\data\ad\Ad;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/system/application/AbstractApplication.class.php b/wcfsetup/install/files/lib/system/application/AbstractApplication.class.php
index 63d52e1836..d4f9754f77 100644
--- a/wcfsetup/install/files/lib/system/application/AbstractApplication.class.php
+++ b/wcfsetup/install/files/lib/system/application/AbstractApplication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\application;
 use wcf\data\package\PackageCache;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php b/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php
index 2c9e5a548e..7f48947173 100644
--- a/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/application/ApplicationHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\application;
 use wcf\data\application\Application;
 use wcf\data\application\ApplicationAction;
diff --git a/wcfsetup/install/files/lib/system/application/IApplication.class.php b/wcfsetup/install/files/lib/system/application/IApplication.class.php
index 9bf70414ef..18feb7b694 100644
--- a/wcfsetup/install/files/lib/system/application/IApplication.class.php
+++ b/wcfsetup/install/files/lib/system/application/IApplication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\application;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/attachment/AbstractAttachmentObjectType.class.php b/wcfsetup/install/files/lib/system/attachment/AbstractAttachmentObjectType.class.php
index 95742dfd99..c34e3f0743 100644
--- a/wcfsetup/install/files/lib/system/attachment/AbstractAttachmentObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/attachment/AbstractAttachmentObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\attachment;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/attachment/AttachmentHandler.class.php b/wcfsetup/install/files/lib/system/attachment/AttachmentHandler.class.php
index afc47a49c1..8f42304db5 100644
--- a/wcfsetup/install/files/lib/system/attachment/AttachmentHandler.class.php
+++ b/wcfsetup/install/files/lib/system/attachment/AttachmentHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\attachment;
 use wcf\data\attachment\AttachmentAction;
 use wcf\data\attachment\AttachmentList;
diff --git a/wcfsetup/install/files/lib/system/attachment/IAttachmentObjectType.class.php b/wcfsetup/install/files/lib/system/attachment/IAttachmentObjectType.class.php
index 59b515841c..38e678aa35 100644
--- a/wcfsetup/install/files/lib/system/attachment/IAttachmentObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/attachment/IAttachmentObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\attachment;
 use wcf\data\attachment\Attachment;
 use wcf\data\IUserContent;
diff --git a/wcfsetup/install/files/lib/system/background/BackgroundQueueHandler.class.php b/wcfsetup/install/files/lib/system/background/BackgroundQueueHandler.class.php
index 0e7b4564a8..4675bfe7c1 100644
--- a/wcfsetup/install/files/lib/system/background/BackgroundQueueHandler.class.php
+++ b/wcfsetup/install/files/lib/system/background/BackgroundQueueHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\background;
 use wcf\data\user\User;
 use wcf\system\background\job\AbstractBackgroundJob;
diff --git a/wcfsetup/install/files/lib/system/background/job/AbstractBackgroundJob.class.php b/wcfsetup/install/files/lib/system/background/job/AbstractBackgroundJob.class.php
index 0c3fec601d..eb43b5f631 100644
--- a/wcfsetup/install/files/lib/system/background/job/AbstractBackgroundJob.class.php
+++ b/wcfsetup/install/files/lib/system/background/job/AbstractBackgroundJob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\background\job;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/background/job/EmailDeliveryBackgroundJob.class.php b/wcfsetup/install/files/lib/system/background/job/EmailDeliveryBackgroundJob.class.php
index ec6ec36054..78ce9b7281 100644
--- a/wcfsetup/install/files/lib/system/background/job/EmailDeliveryBackgroundJob.class.php
+++ b/wcfsetup/install/files/lib/system/background/job/EmailDeliveryBackgroundJob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\background\job;
 use wcf\system\email\transport\exception\PermanentFailure;
 use wcf\system\email\Email;
diff --git a/wcfsetup/install/files/lib/system/bbcode/AbstractBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/AbstractBBCode.class.php
index 2fdf1957e0..2b7f468fd0 100644
--- a/wcfsetup/install/files/lib/system/bbcode/AbstractBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/AbstractBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\bbcode\BBCode;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php
index b1abcfd01d..5930d0f529 100644
--- a/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\attachment\GroupedAttachmentList;
 use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
diff --git a/wcfsetup/install/files/lib/system/bbcode/BBCodeHandler.class.php b/wcfsetup/install/files/lib/system/bbcode/BBCodeHandler.class.php
index 433a0ba748..dbb5626e33 100644
--- a/wcfsetup/install/files/lib/system/bbcode/BBCodeHandler.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/BBCodeHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\bbcode\BBCode;
 use wcf\data\bbcode\BBCodeCache;
diff --git a/wcfsetup/install/files/lib/system/bbcode/BBCodeParser.class.php b/wcfsetup/install/files/lib/system/bbcode/BBCodeParser.class.php
index 5dfe9734c3..82fb9ff291 100644
--- a/wcfsetup/install/files/lib/system/bbcode/BBCodeParser.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/BBCodeParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\bbcode\attribute\BBCodeAttribute;
 use wcf\data\bbcode\BBCode;
diff --git a/wcfsetup/install/files/lib/system/bbcode/EmailBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/EmailBBCode.class.php
index 9fae5180d8..000d0487de 100644
--- a/wcfsetup/install/files/lib/system/bbcode/EmailBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/EmailBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/HtmlBBCodeParser.class.php b/wcfsetup/install/files/lib/system/bbcode/HtmlBBCodeParser.class.php
index 4d7d7c9ef5..a5915a5d59 100644
--- a/wcfsetup/install/files/lib/system/bbcode/HtmlBBCodeParser.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/HtmlBBCodeParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\system\exception\SystemException;
 use wcf\util\DOMUtil;
diff --git a/wcfsetup/install/files/lib/system/bbcode/IBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/IBBCode.class.php
index c2bfb817b6..559847be60 100644
--- a/wcfsetup/install/files/lib/system/bbcode/IBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/IBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\IDatabaseObjectProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/KeywordHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/KeywordHighlighter.class.php
index 6cd6b30790..3b9244d886 100644
--- a/wcfsetup/install/files/lib/system/bbcode/KeywordHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/KeywordHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\system\SingletonFactory;
 use wcf\util\ArrayUtil;
diff --git a/wcfsetup/install/files/lib/system/bbcode/MediaBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/MediaBBCode.class.php
index 2d4a81c954..58d5bf9662 100644
--- a/wcfsetup/install/files/lib/system/bbcode/MediaBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/MediaBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\bbcode\media\provider\BBCodeMediaProvider;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/bbcode/MessageParser.class.php b/wcfsetup/install/files/lib/system/bbcode/MessageParser.class.php
index edaebd22eb..35d930590c 100644
--- a/wcfsetup/install/files/lib/system/bbcode/MessageParser.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/MessageParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\bbcode\attribute\BBCodeAttribute;
 use wcf\data\smiley\Smiley;
diff --git a/wcfsetup/install/files/lib/system/bbcode/SimpleMessageParser.class.php b/wcfsetup/install/files/lib/system/bbcode/SimpleMessageParser.class.php
index 3c09660627..464fa1caca 100644
--- a/wcfsetup/install/files/lib/system/bbcode/SimpleMessageParser.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/SimpleMessageParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\smiley\Smiley;
 use wcf\data\smiley\SmileyCache;
diff --git a/wcfsetup/install/files/lib/system/bbcode/TdBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/TdBBCode.class.php
index 8652e52ee8..f77d18d17c 100644
--- a/wcfsetup/install/files/lib/system/bbcode/TdBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/TdBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/TrBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/TrBBCode.class.php
index 3164192662..eeb6509bfd 100644
--- a/wcfsetup/install/files/lib/system/bbcode/TrBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/TrBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/UserBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/UserBBCode.class.php
index 09fd82e360..a2a2809797 100644
--- a/wcfsetup/install/files/lib/system/bbcode/UserBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/UserBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\user\UserProfile;
 use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
diff --git a/wcfsetup/install/files/lib/system/bbcode/WoltLabSuiteMediaBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/WoltLabSuiteMediaBBCode.class.php
index 1b80b7c89a..e4e942fb65 100644
--- a/wcfsetup/install/files/lib/system/bbcode/WoltLabSuiteMediaBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/WoltLabSuiteMediaBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\media\ViewableMedia;
 use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
diff --git a/wcfsetup/install/files/lib/system/bbcode/WoltLabSuitePageBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/WoltLabSuitePageBBCode.class.php
index 69b77f7425..bad355e9fb 100644
--- a/wcfsetup/install/files/lib/system/bbcode/WoltLabSuitePageBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/WoltLabSuitePageBBCode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode;
 use wcf\data\page\Page;
 use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/BashHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/BashHighlighter.class.php
index d9667d34f1..7baa188b1d 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/BashHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/BashHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/CHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/CHighlighter.class.php
index b10448cbae..3facb47b7f 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/CHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/CHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/CssHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/CssHighlighter.class.php
index 6f880bd9c0..8b15ebea3a 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/CssHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/CssHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/DiffHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/DiffHighlighter.class.php
index 0997712b77..8800ef1e94 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/DiffHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/DiffHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/Highlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/Highlighter.class.php
index dff92f24bb..186decd210 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/Highlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/Highlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\system\Regex;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/HtmlHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/HtmlHighlighter.class.php
index ea71a5c9f0..42c1f1e11e 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/HtmlHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/HtmlHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\system\Regex;
 use wcf\util\StringStack;
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/JavaHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/JavaHighlighter.class.php
index 59b964ad11..22d53cc417 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/JavaHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/JavaHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/JsHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/JsHighlighter.class.php
index cff68f86e0..707fa5a575 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/JsHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/JsHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/PerlHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/PerlHighlighter.class.php
index 87d8228476..1db4861338 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/PerlHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/PerlHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/PhpHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/PhpHighlighter.class.php
index 54af6e23e3..7782d22b59 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/PhpHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/PhpHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\system\Regex;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/PlainHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/PlainHighlighter.class.php
index 3b9282426a..c65a47ae1e 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/PlainHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/PlainHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/PythonHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/PythonHighlighter.class.php
index b901fd414e..5e36c62016 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/PythonHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/PythonHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/SqlHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/SqlHighlighter.class.php
index 588c341749..5dbcb77f57 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/SqlHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/SqlHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\util\StringStack;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/TexHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/TexHighlighter.class.php
index 42806fa264..7f5f001b0e 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/TexHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/TexHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\system\Regex;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/TplHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/TplHighlighter.class.php
index c3fed646f0..07d524f7f6 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/TplHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/TplHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\system\Regex;
 
diff --git a/wcfsetup/install/files/lib/system/bbcode/highlighter/XmlHighlighter.class.php b/wcfsetup/install/files/lib/system/bbcode/highlighter/XmlHighlighter.class.php
index efaa7ad005..843fdffec7 100644
--- a/wcfsetup/install/files/lib/system/bbcode/highlighter/XmlHighlighter.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/highlighter/XmlHighlighter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\highlighter;
 use wcf\system\Regex;
 use wcf\util\StringStack;
diff --git a/wcfsetup/install/files/lib/system/bbcode/media/provider/IBBCodeMediaProvider.class.php b/wcfsetup/install/files/lib/system/bbcode/media/provider/IBBCodeMediaProvider.class.php
index 5ee711c2f9..13724235d0 100644
--- a/wcfsetup/install/files/lib/system/bbcode/media/provider/IBBCodeMediaProvider.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/media/provider/IBBCodeMediaProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\media\provider;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bbcode/media/provider/YouTubeBBCodeMediaProvider.class.php b/wcfsetup/install/files/lib/system/bbcode/media/provider/YouTubeBBCodeMediaProvider.class.php
index 95ffb0effd..d9eddcb0ed 100644
--- a/wcfsetup/install/files/lib/system/bbcode/media/provider/YouTubeBBCodeMediaProvider.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/media/provider/YouTubeBBCodeMediaProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bbcode\media\provider;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/benchmark/Benchmark.class.php b/wcfsetup/install/files/lib/system/benchmark/Benchmark.class.php
index ae7cc4f08f..5793811b10 100644
--- a/wcfsetup/install/files/lib/system/benchmark/Benchmark.class.php
+++ b/wcfsetup/install/files/lib/system/benchmark/Benchmark.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\benchmark;
 use wcf\system\SingletonFactory;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/box/AbstractBoxController.class.php b/wcfsetup/install/files/lib/system/box/AbstractBoxController.class.php
index 5c1b437cde..f82e728732 100644
--- a/wcfsetup/install/files/lib/system/box/AbstractBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/AbstractBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\box\Box;
 use wcf\data\box\BoxAction;
diff --git a/wcfsetup/install/files/lib/system/box/AbstractCommentListBoxController.class.php b/wcfsetup/install/files/lib/system/box/AbstractCommentListBoxController.class.php
index c4e503fc5f..2f3179733c 100644
--- a/wcfsetup/install/files/lib/system/box/AbstractCommentListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/AbstractCommentListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\comment\ViewableCommentList;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/system/box/AbstractDatabaseObjectListBoxController.class.php b/wcfsetup/install/files/lib/system/box/AbstractDatabaseObjectListBoxController.class.php
index bd3659d375..92a6b2c8c6 100644
--- a/wcfsetup/install/files/lib/system/box/AbstractDatabaseObjectListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/AbstractDatabaseObjectListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\box\Box;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/system/box/ArticleCategoriesBoxController.class.php b/wcfsetup/install/files/lib/system/box/ArticleCategoriesBoxController.class.php
index 7f7f15f718..080d623d8b 100644
--- a/wcfsetup/install/files/lib/system/box/ArticleCategoriesBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/ArticleCategoriesBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\article\category\ArticleCategoryNodeTree;
 use wcf\page\ArticlePage;
diff --git a/wcfsetup/install/files/lib/system/box/ArticleCommentListBoxController.class.php b/wcfsetup/install/files/lib/system/box/ArticleCommentListBoxController.class.php
index cd07fed69c..38456dd3e1 100644
--- a/wcfsetup/install/files/lib/system/box/ArticleCommentListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/ArticleCommentListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\Article;
diff --git a/wcfsetup/install/files/lib/system/box/ArticleListBoxController.class.php b/wcfsetup/install/files/lib/system/box/ArticleListBoxController.class.php
index b75ffc5b7f..81f5445f9f 100644
--- a/wcfsetup/install/files/lib/system/box/ArticleListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/ArticleListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\article\AccessibleArticleList;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/box/ArticleTagCloudBoxController.class.php b/wcfsetup/install/files/lib/system/box/ArticleTagCloudBoxController.class.php
index ac7abfd42e..0840ecc82c 100644
--- a/wcfsetup/install/files/lib/system/box/ArticleTagCloudBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/ArticleTagCloudBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/box/BoxHandler.class.php b/wcfsetup/install/files/lib/system/box/BoxHandler.class.php
index 4fb95c7c27..a39fce6a55 100644
--- a/wcfsetup/install/files/lib/system/box/BoxHandler.class.php
+++ b/wcfsetup/install/files/lib/system/box/BoxHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\box\Box;
 use wcf\data\box\BoxList;
diff --git a/wcfsetup/install/files/lib/system/box/FollowingsOnlineBoxController.class.php b/wcfsetup/install/files/lib/system/box/FollowingsOnlineBoxController.class.php
index 3db259ef6b..09650ebb44 100644
--- a/wcfsetup/install/files/lib/system/box/FollowingsOnlineBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/FollowingsOnlineBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\online\UsersOnlineList;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/box/IBoxController.class.php b/wcfsetup/install/files/lib/system/box/IBoxController.class.php
index 6ea46f1f4b..910b1ada83 100644
--- a/wcfsetup/install/files/lib/system/box/IBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/IBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\box\Box;
 use wcf\data\media\ViewableMedia;
diff --git a/wcfsetup/install/files/lib/system/box/IConditionBoxController.class.php b/wcfsetup/install/files/lib/system/box/IConditionBoxController.class.php
index 7269ec0872..c04f85c187 100644
--- a/wcfsetup/install/files/lib/system/box/IConditionBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/IConditionBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\object\type\ObjectType;
 
diff --git a/wcfsetup/install/files/lib/system/box/PageCommentListBoxController.class.php b/wcfsetup/install/files/lib/system/box/PageCommentListBoxController.class.php
index 4c489bdb23..735be494f3 100644
--- a/wcfsetup/install/files/lib/system/box/PageCommentListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/PageCommentListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\system\comment\CommentHandler;
 use wcf\system\request\RequestHandler;
diff --git a/wcfsetup/install/files/lib/system/box/PaidSubscriptionsBoxController.class.php b/wcfsetup/install/files/lib/system/box/PaidSubscriptionsBoxController.class.php
index 9cb9d6ea03..e7ebd52a2c 100644
--- a/wcfsetup/install/files/lib/system/box/PaidSubscriptionsBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/PaidSubscriptionsBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserList;
 use wcf\system\cache\builder\PaidSubscriptionCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/box/RecentActivityListBoxController.class.php b/wcfsetup/install/files/lib/system/box/RecentActivityListBoxController.class.php
index 1b26799dd2..b59f89957f 100644
--- a/wcfsetup/install/files/lib/system/box/RecentActivityListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/RecentActivityListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\activity\event\ViewableUserActivityEventList;
 use wcf\system\condition\IObjectListCondition;
diff --git a/wcfsetup/install/files/lib/system/box/RegisterButtonBoxController.class.php b/wcfsetup/install/files/lib/system/box/RegisterButtonBoxController.class.php
index 8019520680..a5f3563b85 100644
--- a/wcfsetup/install/files/lib/system/box/RegisterButtonBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/RegisterButtonBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/box/SignedInAsBoxController.class.php b/wcfsetup/install/files/lib/system/box/SignedInAsBoxController.class.php
index f550171dd6..26f085deff 100644
--- a/wcfsetup/install/files/lib/system/box/SignedInAsBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/SignedInAsBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/box/StaffOnlineListBoxController.class.php b/wcfsetup/install/files/lib/system/box/StaffOnlineListBoxController.class.php
index a010183ded..ad45501d9b 100644
--- a/wcfsetup/install/files/lib/system/box/StaffOnlineListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/StaffOnlineListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\online\UsersOnlineList;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/box/StatisticsBoxController.class.php b/wcfsetup/install/files/lib/system/box/StatisticsBoxController.class.php
index d747c83bd9..c8baac6bee 100644
--- a/wcfsetup/install/files/lib/system/box/StatisticsBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/StatisticsBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\system\cache\builder\UserStatsCacheBuilder;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/box/TagCloudBoxController.class.php b/wcfsetup/install/files/lib/system/box/TagCloudBoxController.class.php
index 8546b88ad3..6fc7bcdf2e 100644
--- a/wcfsetup/install/files/lib/system/box/TagCloudBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/TagCloudBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\system\language\LanguageFactory;
 use wcf\system\tagging\TagCloud;
diff --git a/wcfsetup/install/files/lib/system/box/TodaysBirthdaysBoxController.class.php b/wcfsetup/install/files/lib/system/box/TodaysBirthdaysBoxController.class.php
index bafa59cf57..78841a5aef 100644
--- a/wcfsetup/install/files/lib/system/box/TodaysBirthdaysBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/TodaysBirthdaysBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\option\UserOption;
 use wcf\system\cache\builder\UserOptionCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/box/TodaysFollowingBirthdaysBoxController.class.php b/wcfsetup/install/files/lib/system/box/TodaysFollowingBirthdaysBoxController.class.php
index 46bac3f366..25e58dbb88 100644
--- a/wcfsetup/install/files/lib/system/box/TodaysFollowingBirthdaysBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/TodaysFollowingBirthdaysBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/box/UserListBoxController.class.php b/wcfsetup/install/files/lib/system/box/UserListBoxController.class.php
index d85e47f765..da02f6b164 100644
--- a/wcfsetup/install/files/lib/system/box/UserListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/UserListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\UserProfileList;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/box/UserOnlineListBoxController.class.php b/wcfsetup/install/files/lib/system/box/UserOnlineListBoxController.class.php
index 16ffc13ec6..2b14593b36 100644
--- a/wcfsetup/install/files/lib/system/box/UserOnlineListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/UserOnlineListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\online\UsersOnlineList;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/box/UserTrophyListBoxController.class.php b/wcfsetup/install/files/lib/system/box/UserTrophyListBoxController.class.php
index 050f9f7a2e..bc1328ca27 100644
--- a/wcfsetup/install/files/lib/system/box/UserTrophyListBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/UserTrophyListBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\trophy\UserTrophyList;
 use wcf\system\cache\builder\UserOptionCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/box/WhoWasOnlineBoxController.class.php b/wcfsetup/install/files/lib/system/box/WhoWasOnlineBoxController.class.php
index c5d7152e12..15eec0071a 100644
--- a/wcfsetup/install/files/lib/system/box/WhoWasOnlineBoxController.class.php
+++ b/wcfsetup/install/files/lib/system/box/WhoWasOnlineBoxController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\box;
 use wcf\data\user\online\UsersOnlineList;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumb.class.php b/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumb.class.php
index e49489f318..b6663c7b7f 100644
--- a/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumb.class.php
+++ b/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumb.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\breadcrumb;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php b/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php
index 51b3122c59..87a1757d2a 100644
--- a/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php
+++ b/wcfsetup/install/files/lib/system/breadcrumb/Breadcrumbs.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\breadcrumb;
 use wcf\data\page\PageCache;
 use wcf\system\page\PageLocationManager;
diff --git a/wcfsetup/install/files/lib/system/breadcrumb/IBreadcrumbProvider.class.php b/wcfsetup/install/files/lib/system/breadcrumb/IBreadcrumbProvider.class.php
index 6ca98c0e3a..6103eab647 100644
--- a/wcfsetup/install/files/lib/system/breadcrumb/IBreadcrumbProvider.class.php
+++ b/wcfsetup/install/files/lib/system/breadcrumb/IBreadcrumbProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\breadcrumb;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessableObjectType.class.php b/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessableObjectType.class.php
index b752fd175b..439e237e8d 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessableObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessableObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessingAction.class.php
index 331eaa0e78..f272f1868d 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/AbstractBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessableObjectType.class.php b/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessableObjectType.class.php
index 2e1940eded..0a5655e48f 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessableObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessableObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessingAction.class.php
index bb7e794118..521820decc 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/IBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/TReasonedBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/TReasonedBulkProcessingAction.class.php
index 53526c2a05..f02f3bce57 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/TReasonedBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/TReasonedBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing;
 use wcf\util\StringUtil;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserBulkProcessingAction.class.php
index f0d9da75b5..b8bfc46448 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserGroupsUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserGroupsUserBulkProcessingAction.class.php
index 110f437336..9e00c4e092 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserGroupsUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/AbstractUserGroupsUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\UserEditor;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/AssignToUserGroupsUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/AssignToUserGroupsUserBulkProcessingAction.class.php
index e5281c88a7..d6b9bed6ed 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/AssignToUserGroupsUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/AssignToUserGroupsUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\UserEditor;
 
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/DeleteUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/DeleteUserBulkProcessingAction.class.php
index 12d959bf7d..154874cc6c 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/DeleteUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/DeleteUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\UserAction;
 use wcf\data\user\UserList;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/ExportMailAddressUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/ExportMailAddressUserBulkProcessingAction.class.php
index aa45c14013..aa05f3c5fd 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/ExportMailAddressUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/ExportMailAddressUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\UserList;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/RemoveFromUserGroupsUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/RemoveFromUserGroupsUserBulkProcessingAction.class.php
index a46e4f09b7..f6c517610f 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/RemoveFromUserGroupsUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/RemoveFromUserGroupsUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\UserEditor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/SendMailUserBulkProcessingAction.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/SendMailUserBulkProcessingAction.class.php
index 920091265e..06f6939d39 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/SendMailUserBulkProcessingAction.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/SendMailUserBulkProcessingAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\data\user\UserList;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/bulk/processing/user/UserBulkProcessableObjectType.class.php b/wcfsetup/install/files/lib/system/bulk/processing/user/UserBulkProcessableObjectType.class.php
index 8de66ccc91..15f1624eee 100644
--- a/wcfsetup/install/files/lib/system/bulk/processing/user/UserBulkProcessableObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/bulk/processing/user/UserBulkProcessableObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\bulk\processing\user;
 use wcf\system\bulk\processing\AbstractBulkProcessableObjectType;
 
diff --git a/wcfsetup/install/files/lib/system/cache/CacheHandler.class.php b/wcfsetup/install/files/lib/system/cache/CacheHandler.class.php
index a427ca6e08..29e4a763d5 100644
--- a/wcfsetup/install/files/lib/system/cache/CacheHandler.class.php
+++ b/wcfsetup/install/files/lib/system/cache/CacheHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache;
 use wcf\system\cache\builder\ICacheBuilder;
 use wcf\system\cache\source\DiskCacheSource;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ACLOptionCategoryCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ACLOptionCategoryCacheBuilder.class.php
index b81c5df091..91a2bb2a39 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ACLOptionCategoryCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ACLOptionCategoryCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\acl\option\category\ACLOptionCategoryList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ACPMenuCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ACPMenuCacheBuilder.class.php
index aa06321e86..0ec74f26ce 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ACPMenuCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ACPMenuCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\acp\form\OptionForm;
 use wcf\data\acp\menu\item\ACPMenuItem;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ACPSearchProviderCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ACPSearchProviderCacheBuilder.class.php
index 2f38cf79a8..edc3f8cb0a 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ACPSearchProviderCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ACPSearchProviderCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\acp\search\provider\ACPSearchProviderList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/AbstractCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/AbstractCacheBuilder.class.php
index 7a6e6e4f06..521fcfaabb 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/AbstractCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/AbstractCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\system\cache\CacheHandler;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/AbstractSortedUserCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/AbstractSortedUserCacheBuilder.class.php
index a26c095119..c08f7ec9d0 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/AbstractSortedUserCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/AbstractSortedUserCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\UserList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/AdCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/AdCacheBuilder.class.php
index 2b26cc37a4..f018345ccd 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/AdCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/AdCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\ad\AdList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ApplicationCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ApplicationCacheBuilder.class.php
index 9cb6af3eac..e10218060e 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ApplicationCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ApplicationCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\application\ApplicationList;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ArticleCategoryLabelCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ArticleCategoryLabelCacheBuilder.class.php
index a72fa6cb80..4926ded54d 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ArticleCategoryLabelCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ArticleCategoryLabelCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\category\CategoryHandler;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/BBCodeCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/BBCodeCacheBuilder.class.php
index e3f54412b9..e1270e380b 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/BBCodeCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/BBCodeCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\bbcode\attribute\BBCodeAttribute;
 use wcf\data\bbcode\BBCodeList;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/BBCodeMediaProviderCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/BBCodeMediaProviderCacheBuilder.class.php
index a98f4af48b..628c9e9fa0 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/BBCodeMediaProviderCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/BBCodeMediaProviderCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\bbcode\media\provider\BBCodeMediaProviderList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/CaptchaQuestionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/CaptchaQuestionCacheBuilder.class.php
index c5c6fc4cce..c9c6f262c8 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/CaptchaQuestionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/CaptchaQuestionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\captcha\question\CaptchaQuestionList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/CategoryACLOptionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/CategoryACLOptionCacheBuilder.class.php
index a264ed18de..8ebdcf99ab 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/CategoryACLOptionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/CategoryACLOptionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\category\Category;
 use wcf\system\acl\ACLHandler;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/CategoryCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/CategoryCacheBuilder.class.php
index c840df1cc5..629dba5599 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/CategoryCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/CategoryCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\category\CategoryList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ClipboardActionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ClipboardActionCacheBuilder.class.php
index ab6408bfea..15a30d7a6e 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ClipboardActionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ClipboardActionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\clipboard\action\ClipboardActionList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ClipboardPageCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ClipboardPageCacheBuilder.class.php
index 10b49f26fc..a8163e6fd1 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ClipboardPageCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ClipboardPageCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ConditionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ConditionCacheBuilder.class.php
index 958d8eaaad..284f5f0734 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ConditionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ConditionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\condition\ConditionList;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ContactOptionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ContactOptionCacheBuilder.class.php
index f45244f7e7..cf13011f85 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ContactOptionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ContactOptionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\contact\option\ContactOptionList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/CoreObjectCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/CoreObjectCacheBuilder.class.php
index 7dde5f1fd3..9ef8799c80 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/CoreObjectCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/CoreObjectCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\core\object\CoreObjectList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/CronjobCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/CronjobCacheBuilder.class.php
index 6db1b1dc7b..b5a27832a8 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/CronjobCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/CronjobCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/EventListenerCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/EventListenerCacheBuilder.class.php
index 259f6b8cea..79fc93c8d2 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/EventListenerCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/EventListenerCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\event\listener\EventListener;
 use wcf\system\cache\CacheHandler;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ICacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ICacheBuilder.class.php
index 0a6df13ccc..76cc86cdf8 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ICacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ICacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cache/builder/LabelCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/LabelCacheBuilder.class.php
index d09f8da91d..0e21f454e8 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/LabelCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/LabelCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\label\group\LabelGroupList;
 use wcf\data\label\group\ViewableLabelGroup;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/LanguageCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/LanguageCacheBuilder.class.php
index 98053b6309..79d64ce5bb 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/LanguageCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/LanguageCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\language\category\LanguageCategoryList;
 use wcf\data\language\LanguageList;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/MenuCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/MenuCacheBuilder.class.php
index af552ff1ee..7d8240e5be 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/MenuCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/MenuCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\menu\item\MenuItemList;
 use wcf\data\menu\MenuList;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/MostActiveMembersCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/MostActiveMembersCacheBuilder.class.php
index fb8748f556..8eda14285e 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/MostActiveMembersCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/MostActiveMembersCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cache/builder/MostLikedMembersCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/MostLikedMembersCacheBuilder.class.php
index 5da8bf857d..707f72b3f7 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/MostLikedMembersCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/MostLikedMembersCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cache/builder/NewestMembersCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/NewestMembersCacheBuilder.class.php
index 3a30681547..80688d0962 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/NewestMembersCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/NewestMembersCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cache/builder/NoticeCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/NoticeCacheBuilder.class.php
index 6f5870c76d..56523ad392 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/NoticeCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/NoticeCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\notice\NoticeList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ObjectTypeCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ObjectTypeCacheBuilder.class.php
index 2cb2b3ff7f..defa1c166c 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ObjectTypeCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ObjectTypeCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\object\type\definition\ObjectTypeDefinition;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/OptionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/OptionCacheBuilder.class.php
index b2cc84ba67..bbba5895c8 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/OptionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/OptionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\option\category\OptionCategory;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/PackageCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/PackageCacheBuilder.class.php
index 963c699917..0cf65c553c 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/PackageCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/PackageCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\package\PackageList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/PackageUpdateCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/PackageUpdateCacheBuilder.class.php
index 1c90553d00..6db2243c2d 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/PackageUpdateCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/PackageUpdateCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\system\package\PackageUpdateDispatcher;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/PageCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/PageCacheBuilder.class.php
index 600a9c26e7..330a5cc53a 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/PageCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/PageCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\page\Page;
 use wcf\data\page\PageList;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/PaidSubscriptionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/PaidSubscriptionCacheBuilder.class.php
index 287de1956e..a57ca9f8ac 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/PaidSubscriptionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/PaidSubscriptionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\paid\subscription\PaidSubscriptionList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/RoutingCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/RoutingCacheBuilder.class.php
index cc00b3a504..840199fccf 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/RoutingCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/RoutingCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\acp\page\ArticleListPage;
 use wcf\data\application\Application;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/SimpleAclCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/SimpleAclCacheBuilder.class.php
index e59d28ae8d..a1e95a6425 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/SimpleAclCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/SimpleAclCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\system\acl\simple\SimpleAclHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/SmileyCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/SmileyCacheBuilder.class.php
index 4a13471919..6722e207f2 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/SmileyCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/SmileyCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\smiley\Smiley;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/SpiderCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/SpiderCacheBuilder.class.php
index 845dc0e8f8..d8274b538d 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/SpiderCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/SpiderCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\spider\SpiderList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/StyleCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/StyleCacheBuilder.class.php
index febaf8523a..095bf85a52 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/StyleCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/StyleCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\style\Style;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/TagCloudCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/TagCloudCacheBuilder.class.php
index ab53d3fde9..e096477601 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/TagCloudCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/TagCloudCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\tag\Tag;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/TemplateGroupCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/TemplateGroupCacheBuilder.class.php
index 84ef5da4b6..b9b0a0c24d 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/TemplateGroupCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/TemplateGroupCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\template\group\TemplateGroupList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCacheBuilder.class.php
index ac586af3bc..d766559d2c 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\template\listener\TemplateListenerList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCodeCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCodeCacheBuilder.class.php
index a1e2543e36..d7e92a6c95 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCodeCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/TemplateListenerCodeCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\template\listener\TemplateListenerList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/TrophyCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/TrophyCacheBuilder.class.php
index 5e0e0570ea..e1d01e0093 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/TrophyCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/TrophyCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\trophy\TrophyList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/TypedTagCloudCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/TypedTagCloudCacheBuilder.class.php
index 9ac1217d28..61b7fa6c18 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/TypedTagCloudCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/TypedTagCloudCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserBirthdayCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserBirthdayCacheBuilder.class.php
index 7231bba115..fe9531707b 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserBirthdayCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserBirthdayCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\User;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserGroupAssignmentCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserGroupAssignmentCacheBuilder.class.php
index fe36ace7f7..193371082b 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserGroupAssignmentCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserGroupAssignmentCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\group\assignment\UserGroupAssignmentList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserGroupCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserGroupCacheBuilder.class.php
index ebcb2cf2bd..236c9f704f 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserGroupCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserGroupCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\group\UserGroupList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserGroupOptionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserGroupOptionCacheBuilder.class.php
index e5fee6a5b7..0d827b27fc 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserGroupOptionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserGroupOptionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\group\option\UserGroupOption;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserGroupPermissionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserGroupPermissionCacheBuilder.class.php
index 7c8b3fdcd8..d02d53da46 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserGroupPermissionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserGroupPermissionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\group\option\UserGroupOption;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserMenuCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserMenuCacheBuilder.class.php
index 222469e3f2..cbd1dde3bf 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserMenuCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserMenuCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\menu\item\UserMenuItem;
 use wcf\form\SettingsForm;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserNotificationEventCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserNotificationEventCacheBuilder.class.php
index 75a4a461ba..3f17539d41 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserNotificationEventCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserNotificationEventCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\notification\event\UserNotificationEvent;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserOptionCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserOptionCacheBuilder.class.php
index 03d5c53e39..447f2451b9 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserOptionCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserOptionCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\option\UserOption;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserProfileMenuCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserProfileMenuCacheBuilder.class.php
index 01d704d45d..816d2fdb85 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserProfileMenuCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserProfileMenuCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\profile\menu\item\UserProfileMenuItemList;
 
diff --git a/wcfsetup/install/files/lib/system/cache/builder/UserStatsCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/UserStatsCacheBuilder.class.php
index 85c409eb0b..bcd6272966 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/UserStatsCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/UserStatsCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\data\user\User;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cache/builder/WhoWasOnlineCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/WhoWasOnlineCacheBuilder.class.php
index 9c7f889188..103b87b69a 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/WhoWasOnlineCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/WhoWasOnlineCacheBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\builder;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/AbstractRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/AbstractRuntimeCache.class.php
index 99b3c94c26..318a4b831c 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/AbstractRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/AbstractRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\DatabaseObject;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/CommentResponseRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/CommentResponseRuntimeCache.class.php
index 95e9d084b8..771bcfdeca 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/CommentResponseRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/CommentResponseRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/CommentRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/CommentRuntimeCache.class.php
index d2e0aa8aef..d8b5e1fdfb 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/CommentRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/CommentRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/IRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/IRuntimeCache.class.php
index c787dc4e1c..53a2ec3300 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/IRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/IRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/MediaRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/MediaRuntimeCache.class.php
index b66c5fbede..7b74fb96b3 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/MediaRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/MediaRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\media\Media;
 use wcf\data\media\MediaList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/UserProfileRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/UserProfileRuntimeCache.class.php
index 4f3549eb43..d133a69334 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/UserProfileRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/UserProfileRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\user\UserProfile;
 use wcf\data\user\UserProfileList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/UserRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/UserRuntimeCache.class.php
index a64e443b5a..bfb16385d7 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/UserRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/UserRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\user\User;
 use wcf\data\user\UserList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/ViewableArticleRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/ViewableArticleRuntimeCache.class.php
index cf67e5f03a..5df044ab25 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/ViewableArticleRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/ViewableArticleRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\article\ViewableArticle;
 use wcf\data\article\ViewableArticleList;
diff --git a/wcfsetup/install/files/lib/system/cache/runtime/ViewableMediaRuntimeCache.class.php b/wcfsetup/install/files/lib/system/cache/runtime/ViewableMediaRuntimeCache.class.php
index 9977d3eab2..bbb5fcd0b1 100644
--- a/wcfsetup/install/files/lib/system/cache/runtime/ViewableMediaRuntimeCache.class.php
+++ b/wcfsetup/install/files/lib/system/cache/runtime/ViewableMediaRuntimeCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\runtime;
 use wcf\data\media\ViewableMedia;
 use wcf\data\media\ViewableMediaList;
diff --git a/wcfsetup/install/files/lib/system/cache/source/DiskCacheSource.class.php b/wcfsetup/install/files/lib/system/cache/source/DiskCacheSource.class.php
index fa2d3b5a2c..f5f59edc0d 100644
--- a/wcfsetup/install/files/lib/system/cache/source/DiskCacheSource.class.php
+++ b/wcfsetup/install/files/lib/system/cache/source/DiskCacheSource.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\source;
 use wcf\system\exception\SystemException;
 use wcf\system\io\AtomicWriter;
diff --git a/wcfsetup/install/files/lib/system/cache/source/ICacheSource.class.php b/wcfsetup/install/files/lib/system/cache/source/ICacheSource.class.php
index 7845afccb2..787aca3ca8 100644
--- a/wcfsetup/install/files/lib/system/cache/source/ICacheSource.class.php
+++ b/wcfsetup/install/files/lib/system/cache/source/ICacheSource.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\source;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php b/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php
index 5abb661c05..ded6858e87 100644
--- a/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php
+++ b/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\source;
 use wcf\system\exception\SystemException;
 use wcf\system\Regex;
diff --git a/wcfsetup/install/files/lib/system/cache/source/RedisCacheSource.class.php b/wcfsetup/install/files/lib/system/cache/source/RedisCacheSource.class.php
index 8c8dbeebde..598eaaf620 100644
--- a/wcfsetup/install/files/lib/system/cache/source/RedisCacheSource.class.php
+++ b/wcfsetup/install/files/lib/system/cache/source/RedisCacheSource.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cache\source;
 use wcf\system\database\Redis;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/captcha/CaptchaHandler.class.php b/wcfsetup/install/files/lib/system/captcha/CaptchaHandler.class.php
index 13edd65b72..488bbcf8ef 100644
--- a/wcfsetup/install/files/lib/system/captcha/CaptchaHandler.class.php
+++ b/wcfsetup/install/files/lib/system/captcha/CaptchaHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\captcha;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/captcha/CaptchaQuestionHandler.class.php b/wcfsetup/install/files/lib/system/captcha/CaptchaQuestionHandler.class.php
index 5e0b4128da..87b2951e52 100644
--- a/wcfsetup/install/files/lib/system/captcha/CaptchaQuestionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/captcha/CaptchaQuestionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\captcha;
 use wcf\data\captcha\question\CaptchaQuestion;
 use wcf\system\cache\builder\CaptchaQuestionCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/captcha/ICaptchaHandler.class.php b/wcfsetup/install/files/lib/system/captcha/ICaptchaHandler.class.php
index 56b8b9621f..e6a6098498 100644
--- a/wcfsetup/install/files/lib/system/captcha/ICaptchaHandler.class.php
+++ b/wcfsetup/install/files/lib/system/captcha/ICaptchaHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\captcha;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/captcha/RecaptchaHandler.class.php b/wcfsetup/install/files/lib/system/captcha/RecaptchaHandler.class.php
index 6028faa39f..a2f1543cf2 100644
--- a/wcfsetup/install/files/lib/system/captcha/RecaptchaHandler.class.php
+++ b/wcfsetup/install/files/lib/system/captcha/RecaptchaHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\captcha;
 use wcf\system\recaptcha\RecaptchaHandlerV2;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/category/AbstractCategoryType.class.php b/wcfsetup/install/files/lib/system/category/AbstractCategoryType.class.php
index 69011a0929..bf95414038 100644
--- a/wcfsetup/install/files/lib/system/category/AbstractCategoryType.class.php
+++ b/wcfsetup/install/files/lib/system/category/AbstractCategoryType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\data\category\CategoryEditor;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/category/ArticleCategoryType.class.php b/wcfsetup/install/files/lib/system/category/ArticleCategoryType.class.php
index a4c40a282b..4b60ef0657 100644
--- a/wcfsetup/install/files/lib/system/category/ArticleCategoryType.class.php
+++ b/wcfsetup/install/files/lib/system/category/ArticleCategoryType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/category/CategoryHandler.class.php b/wcfsetup/install/files/lib/system/category/CategoryHandler.class.php
index 9352704a01..4595e685a3 100644
--- a/wcfsetup/install/files/lib/system/category/CategoryHandler.class.php
+++ b/wcfsetup/install/files/lib/system/category/CategoryHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\data\category\Category;
 use wcf\data\object\type\ObjectType;
diff --git a/wcfsetup/install/files/lib/system/category/CategoryPermissionHandler.class.php b/wcfsetup/install/files/lib/system/category/CategoryPermissionHandler.class.php
index b3df73b2c2..fc11686f52 100644
--- a/wcfsetup/install/files/lib/system/category/CategoryPermissionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/category/CategoryPermissionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\data\category\Category;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/category/ICategoryType.class.php b/wcfsetup/install/files/lib/system/category/ICategoryType.class.php
index 9f96fffa55..77b04868c8 100644
--- a/wcfsetup/install/files/lib/system/category/ICategoryType.class.php
+++ b/wcfsetup/install/files/lib/system/category/ICategoryType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\data\category\CategoryEditor;
 
diff --git a/wcfsetup/install/files/lib/system/category/MediaCategoryType.class.php b/wcfsetup/install/files/lib/system/category/MediaCategoryType.class.php
index 49159438dd..fdcc6c77f2 100644
--- a/wcfsetup/install/files/lib/system/category/MediaCategoryType.class.php
+++ b/wcfsetup/install/files/lib/system/category/MediaCategoryType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/category/SmileyCategoryType.class.php b/wcfsetup/install/files/lib/system/category/SmileyCategoryType.class.php
index 34ef021ecb..df60f5756b 100644
--- a/wcfsetup/install/files/lib/system/category/SmileyCategoryType.class.php
+++ b/wcfsetup/install/files/lib/system/category/SmileyCategoryType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\data\category\CategoryEditor;
 use wcf\system\cache\builder\SmileyCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/category/TrophyCategoryType.class.php b/wcfsetup/install/files/lib/system/category/TrophyCategoryType.class.php
index e0ec86fac9..94fedfe653 100644
--- a/wcfsetup/install/files/lib/system/category/TrophyCategoryType.class.php
+++ b/wcfsetup/install/files/lib/system/category/TrophyCategoryType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\category;
 use wcf\data\category\CategoryEditor;
 use wcf\data\user\trophy\UserTrophyAction;
diff --git a/wcfsetup/install/files/lib/system/cli/DatabaseCLICommandHistory.class.php b/wcfsetup/install/files/lib/system/cli/DatabaseCLICommandHistory.class.php
index 0bd9d2ba48..ee10491c4f 100644
--- a/wcfsetup/install/files/lib/system/cli/DatabaseCLICommandHistory.class.php
+++ b/wcfsetup/install/files/lib/system/cli/DatabaseCLICommandHistory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli;
 use phpline\console\history\MemoryHistory;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cli/command/CLICommandHandler.class.php b/wcfsetup/install/files/lib/system/cli/command/CLICommandHandler.class.php
index 05d7eebf49..f04644e0fa 100644
--- a/wcfsetup/install/files/lib/system/cli/command/CLICommandHandler.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/CLICommandHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use phpline\internal\Log;
 use wcf\system\exception\IllegalLinkException;
diff --git a/wcfsetup/install/files/lib/system/cli/command/CLICommandNameCompleter.class.php b/wcfsetup/install/files/lib/system/cli/command/CLICommandNameCompleter.class.php
index 77f4dbeeba..52de40ce6e 100644
--- a/wcfsetup/install/files/lib/system/cli/command/CLICommandNameCompleter.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/CLICommandNameCompleter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use phpline\console\completer\Completer;
 
diff --git a/wcfsetup/install/files/lib/system/cli/command/CommandsCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/CommandsCLICommand.class.php
index 549000babd..14bb6faace 100644
--- a/wcfsetup/install/files/lib/system/cli/command/CommandsCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/CommandsCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use wcf\system\CLIWCF;
 use wcf\util\CLIUtil;
diff --git a/wcfsetup/install/files/lib/system/cli/command/CronjobCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/CronjobCLICommand.class.php
index 5d4e7769d2..b706aacf49 100644
--- a/wcfsetup/install/files/lib/system/cli/command/CronjobCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/CronjobCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use wcf\data\user\User;
 use wcf\system\cronjob\CronjobScheduler;
diff --git a/wcfsetup/install/files/lib/system/cli/command/ExitCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/ExitCLICommand.class.php
index c0ce0bda35..ae127d65a6 100644
--- a/wcfsetup/install/files/lib/system/cli/command/ExitCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/ExitCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cli/command/HelpCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/HelpCLICommand.class.php
index 3e65c1ab3b..6a62ca143c 100644
--- a/wcfsetup/install/files/lib/system/cli/command/HelpCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/HelpCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use wcf\system\CLIWCF;
 use Zend\Console\Exception\RuntimeException as ArgvException;
diff --git a/wcfsetup/install/files/lib/system/cli/command/IArgumentedCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/IArgumentedCLICommand.class.php
index e00d8d04d5..4d52d63bd0 100644
--- a/wcfsetup/install/files/lib/system/cli/command/IArgumentedCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/IArgumentedCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cli/command/ICLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/ICLICommand.class.php
index 6055fe5954..3d2bed0602 100644
--- a/wcfsetup/install/files/lib/system/cli/command/ICLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/ICLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/cli/command/ImportCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/ImportCLICommand.class.php
index 4329155473..04587b24dd 100644
--- a/wcfsetup/install/files/lib/system/cli/command/ImportCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/ImportCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/cli/command/PackageCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/PackageCLICommand.class.php
index c00f3f2bc6..09d5fc80a3 100644
--- a/wcfsetup/install/files/lib/system/cli/command/PackageCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/PackageCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use phpline\internal\Log;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
diff --git a/wcfsetup/install/files/lib/system/cli/command/WorkerCLICommand.class.php b/wcfsetup/install/files/lib/system/cli/command/WorkerCLICommand.class.php
index a6b631cc3c..97e038dd7b 100644
--- a/wcfsetup/install/files/lib/system/cli/command/WorkerCLICommand.class.php
+++ b/wcfsetup/install/files/lib/system/cli/command/WorkerCLICommand.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cli\command;
 use phpline\internal\Log;
 use wcf\system\worker\IWorker;
diff --git a/wcfsetup/install/files/lib/system/clipboard/ClipboardEditorItem.class.php b/wcfsetup/install/files/lib/system/clipboard/ClipboardEditorItem.class.php
index 1837217190..a4fc7722ac 100644
--- a/wcfsetup/install/files/lib/system/clipboard/ClipboardEditorItem.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/ClipboardEditorItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/clipboard/ClipboardHandler.class.php b/wcfsetup/install/files/lib/system/clipboard/ClipboardHandler.class.php
index 1ddde404b0..cff3533926 100644
--- a/wcfsetup/install/files/lib/system/clipboard/ClipboardHandler.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/ClipboardHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/AbstractClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/AbstractClipboardAction.class.php
index aefdf61b3f..9923480290 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/AbstractClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/AbstractClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/ArticleClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/ArticleClipboardAction.class.php
index fca1abbf54..fc689553dc 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/ArticleClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/ArticleClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\article\Article;
 use wcf\data\article\ArticleAction;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/IClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/IClipboardAction.class.php
index 0348e95bf3..aa2289d363 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/IClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/IClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/MediaClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/MediaClipboardAction.class.php
index 0e3fd0dd2a..40bfa9af1b 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/MediaClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/MediaClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\media\MediaAction;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/TagClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/TagClipboardAction.class.php
index f6c5b473d3..9f44ed1a9a 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/TagClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/TagClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\tag\TagAction;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/UserClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/UserClipboardAction.class.php
index b859bb8cf8..c00ee762b1 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/UserClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/UserClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/system/clipboard/action/UserContentClipboardAction.class.php b/wcfsetup/install/files/lib/system/clipboard/action/UserContentClipboardAction.class.php
index 1ac0ab3031..a03c8b69e8 100644
--- a/wcfsetup/install/files/lib/system/clipboard/action/UserContentClipboardAction.class.php
+++ b/wcfsetup/install/files/lib/system/clipboard/action/UserContentClipboardAction.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\clipboard\action;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\user\UserContentAction;
diff --git a/wcfsetup/install/files/lib/system/comment/CommentDataHandler.class.php b/wcfsetup/install/files/lib/system/comment/CommentDataHandler.class.php
index ebd4b42840..f02809c8cf 100644
--- a/wcfsetup/install/files/lib/system/comment/CommentDataHandler.class.php
+++ b/wcfsetup/install/files/lib/system/comment/CommentDataHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment;
 use wcf\system\cache\runtime\CommentRuntimeCache;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/comment/CommentHandler.class.php b/wcfsetup/install/files/lib/system/comment/CommentHandler.class.php
index 4b1bad8d80..d326767789 100644
--- a/wcfsetup/install/files/lib/system/comment/CommentHandler.class.php
+++ b/wcfsetup/install/files/lib/system/comment/CommentHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment;
 use wcf\data\comment\response\CommentResponseList;
 use wcf\data\comment\CommentEditor;
diff --git a/wcfsetup/install/files/lib/system/comment/manager/AbstractCommentManager.class.php b/wcfsetup/install/files/lib/system/comment/manager/AbstractCommentManager.class.php
index 9bae5b60c3..f535c8f1cc 100644
--- a/wcfsetup/install/files/lib/system/comment/manager/AbstractCommentManager.class.php
+++ b/wcfsetup/install/files/lib/system/comment/manager/AbstractCommentManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment\manager;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\Comment;
diff --git a/wcfsetup/install/files/lib/system/comment/manager/ArticleCommentManager.class.php b/wcfsetup/install/files/lib/system/comment/manager/ArticleCommentManager.class.php
index e305ae9684..27ead29048 100644
--- a/wcfsetup/install/files/lib/system/comment/manager/ArticleCommentManager.class.php
+++ b/wcfsetup/install/files/lib/system/comment/manager/ArticleCommentManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment\manager;
 use wcf\data\article\content\ArticleContent;
 use wcf\data\article\content\ArticleContentList;
diff --git a/wcfsetup/install/files/lib/system/comment/manager/ICommentManager.class.php b/wcfsetup/install/files/lib/system/comment/manager/ICommentManager.class.php
index 446fde87f7..d946591464 100644
--- a/wcfsetup/install/files/lib/system/comment/manager/ICommentManager.class.php
+++ b/wcfsetup/install/files/lib/system/comment/manager/ICommentManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment\manager;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\Comment;
diff --git a/wcfsetup/install/files/lib/system/comment/manager/ModerationQueueCommentManager.class.php b/wcfsetup/install/files/lib/system/comment/manager/ModerationQueueCommentManager.class.php
index 40be2ac18c..e35883f79a 100644
--- a/wcfsetup/install/files/lib/system/comment/manager/ModerationQueueCommentManager.class.php
+++ b/wcfsetup/install/files/lib/system/comment/manager/ModerationQueueCommentManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment\manager;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ModerationQueueEditor;
diff --git a/wcfsetup/install/files/lib/system/comment/manager/PageCommentManager.class.php b/wcfsetup/install/files/lib/system/comment/manager/PageCommentManager.class.php
index 0378ab83d6..e7faac6273 100644
--- a/wcfsetup/install/files/lib/system/comment/manager/PageCommentManager.class.php
+++ b/wcfsetup/install/files/lib/system/comment/manager/PageCommentManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment\manager;
 use wcf\data\comment\response\CommentResponseList;
 use wcf\data\comment\CommentList;
diff --git a/wcfsetup/install/files/lib/system/comment/manager/UserProfileCommentManager.class.php b/wcfsetup/install/files/lib/system/comment/manager/UserProfileCommentManager.class.php
index 3338fb21fd..4c2b5168e7 100644
--- a/wcfsetup/install/files/lib/system/comment/manager/UserProfileCommentManager.class.php
+++ b/wcfsetup/install/files/lib/system/comment/manager/UserProfileCommentManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\comment\manager;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseList;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractCheckboxCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractCheckboxCondition.class.php
index 56008946e1..c997d55c6c 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractCheckboxCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractCheckboxCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractCondition.class.php
index 5608577406..f69507f15f 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractIntegerCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractIntegerCondition.class.php
index 92c4c63db1..738db40b9b 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractIntegerCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractIntegerCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractMultiCategoryCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractMultiCategoryCondition.class.php
index 2ec4d5d64f..1da315b76a 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractMultiCategoryCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractMultiCategoryCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\category\CategoryNode;
 use wcf\data\category\CategoryNodeTree;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractMultiSelectCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractMultiSelectCondition.class.php
index 90fd8df12d..58b85edeca 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractMultiSelectCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractMultiSelectCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\system\exception\UserInputException;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractMultipleFieldsCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractMultipleFieldsCondition.class.php
index 5a07d58fa8..f4af7cd549 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractMultipleFieldsCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractMultipleFieldsCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractObjectTextPropertyCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractObjectTextPropertyCondition.class.php
index f9cdbedd05..a0674330c5 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractObjectTextPropertyCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractObjectTextPropertyCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractSelectCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractSelectCondition.class.php
index 7a6e188090..7ca56d919c 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractSelectCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractSelectCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractSingleFieldCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractSingleFieldCondition.class.php
index 8c2d35ede2..912bde4177 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractSingleFieldCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractSingleFieldCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractTextCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractTextCondition.class.php
index 223d777294..fe4e13b399 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractTextCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractTextCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/condition/AbstractTimestampCondition.class.php b/wcfsetup/install/files/lib/system/condition/AbstractTimestampCondition.class.php
index 2c34699a3a..4f57b870e3 100644
--- a/wcfsetup/install/files/lib/system/condition/AbstractTimestampCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/AbstractTimestampCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/condition/ConditionHandler.class.php b/wcfsetup/install/files/lib/system/condition/ConditionHandler.class.php
index 40c7adac6e..7a52c40914 100644
--- a/wcfsetup/install/files/lib/system/condition/ConditionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/condition/ConditionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\condition\ConditionAction;
diff --git a/wcfsetup/install/files/lib/system/condition/DaysOfWeekCondition.class.php b/wcfsetup/install/files/lib/system/condition/DaysOfWeekCondition.class.php
index 32ddc1e8f7..0468e83d5f 100644
--- a/wcfsetup/install/files/lib/system/condition/DaysOfWeekCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/DaysOfWeekCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/condition/ICondition.class.php b/wcfsetup/install/files/lib/system/condition/ICondition.class.php
index f7ed41ccba..d9758bd54d 100644
--- a/wcfsetup/install/files/lib/system/condition/ICondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/ICondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\IDatabaseObjectProcessor;
diff --git a/wcfsetup/install/files/lib/system/condition/IContentCondition.class.php b/wcfsetup/install/files/lib/system/condition/IContentCondition.class.php
index 5866dbe6c1..51a0dc2946 100644
--- a/wcfsetup/install/files/lib/system/condition/IContentCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/IContentCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 
diff --git a/wcfsetup/install/files/lib/system/condition/IObjectCondition.class.php b/wcfsetup/install/files/lib/system/condition/IObjectCondition.class.php
index b86cb64b0a..78c66d710a 100644
--- a/wcfsetup/install/files/lib/system/condition/IObjectCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/IObjectCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/system/condition/IObjectListCondition.class.php b/wcfsetup/install/files/lib/system/condition/IObjectListCondition.class.php
index 4a55704032..377adebf9c 100644
--- a/wcfsetup/install/files/lib/system/condition/IObjectListCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/IObjectListCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\DatabaseObjectList;
 
diff --git a/wcfsetup/install/files/lib/system/condition/IUserCondition.class.php b/wcfsetup/install/files/lib/system/condition/IUserCondition.class.php
index da8d394487..04a3572e1f 100644
--- a/wcfsetup/install/files/lib/system/condition/IUserCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/IUserCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/MultiPageControllerCondition.class.php b/wcfsetup/install/files/lib/system/condition/MultiPageControllerCondition.class.php
index 380bdac2a8..4b52f696d7 100644
--- a/wcfsetup/install/files/lib/system/condition/MultiPageControllerCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/MultiPageControllerCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 
diff --git a/wcfsetup/install/files/lib/system/condition/TObjectListUserCondition.class.php b/wcfsetup/install/files/lib/system/condition/TObjectListUserCondition.class.php
index 63336556df..5bc6cbb6ae 100644
--- a/wcfsetup/install/files/lib/system/condition/TObjectListUserCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/TObjectListUserCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\UserList;
diff --git a/wcfsetup/install/files/lib/system/condition/TObjectUserCondition.class.php b/wcfsetup/install/files/lib/system/condition/TObjectUserCondition.class.php
index c9e3030970..58ef9a5f35 100644
--- a/wcfsetup/install/files/lib/system/condition/TObjectUserCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/TObjectUserCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/TimeCondition.class.php b/wcfsetup/install/files/lib/system/condition/TimeCondition.class.php
index 7c9fd5e6e8..c1ab989cb8 100644
--- a/wcfsetup/install/files/lib/system/condition/TimeCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/TimeCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/condition/UserAvatarCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserAvatarCondition.class.php
index 5f6425a588..4a7d33569c 100644
--- a/wcfsetup/install/files/lib/system/condition/UserAvatarCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserAvatarCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserBirthdayCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserBirthdayCondition.class.php
index 4e7c02e367..6c356e0039 100644
--- a/wcfsetup/install/files/lib/system/condition/UserBirthdayCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserBirthdayCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\system\user\UserBirthdayCache;
diff --git a/wcfsetup/install/files/lib/system/condition/UserEmailCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserEmailCondition.class.php
index 3bda59e2d8..cb9d68c3ab 100644
--- a/wcfsetup/install/files/lib/system/condition/UserEmailCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserEmailCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserGroupCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserGroupCondition.class.php
index 144caa73b3..5571a8c3c2 100644
--- a/wcfsetup/install/files/lib/system/condition/UserGroupCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserGroupCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/system/condition/UserIntegerPropertyCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserIntegerPropertyCondition.class.php
index fc07d59f62..d631ae4b28 100644
--- a/wcfsetup/install/files/lib/system/condition/UserIntegerPropertyCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserIntegerPropertyCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserLanguageCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserLanguageCondition.class.php
index e9ec84c1e8..aacdb4d0fc 100644
--- a/wcfsetup/install/files/lib/system/condition/UserLanguageCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserLanguageCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserMobileBrowserCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserMobileBrowserCondition.class.php
index 091f404ac3..1466816471 100644
--- a/wcfsetup/install/files/lib/system/condition/UserMobileBrowserCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserMobileBrowserCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/condition/UserOptionsCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserOptionsCondition.class.php
index 42eac31157..bc80f3c2b0 100644
--- a/wcfsetup/install/files/lib/system/condition/UserOptionsCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserOptionsCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserRegistrationDateCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserRegistrationDateCondition.class.php
index 4a6f73d407..fdc595a169 100644
--- a/wcfsetup/install/files/lib/system/condition/UserRegistrationDateCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserRegistrationDateCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserRegistrationDateIntervalCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserRegistrationDateIntervalCondition.class.php
index 2d46da369e..6ea9fa01b4 100644
--- a/wcfsetup/install/files/lib/system/condition/UserRegistrationDateIntervalCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserRegistrationDateIntervalCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserStateCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserStateCondition.class.php
index 85c45efed4..0eba2aa510 100644
--- a/wcfsetup/install/files/lib/system/condition/UserStateCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserStateCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserTimestampPropertyCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserTimestampPropertyCondition.class.php
index bd64db5824..f3030c5a46 100644
--- a/wcfsetup/install/files/lib/system/condition/UserTimestampPropertyCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserTimestampPropertyCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/UserTrophyCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserTrophyCondition.class.php
index b3dff202b5..9c4a7ff1ab 100644
--- a/wcfsetup/install/files/lib/system/condition/UserTrophyCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserTrophyCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\trophy\Trophy;
diff --git a/wcfsetup/install/files/lib/system/condition/UserUsernameCondition.class.php b/wcfsetup/install/files/lib/system/condition/UserUsernameCondition.class.php
index 8335280cfa..78888a7aa2 100644
--- a/wcfsetup/install/files/lib/system/condition/UserUsernameCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/UserUsernameCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition;
 use wcf\data\condition\Condition;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/condition/article/ArticleCategoryCondition.class.php b/wcfsetup/install/files/lib/system/condition/article/ArticleCategoryCondition.class.php
index 2fbd009178..df0d1ee410 100644
--- a/wcfsetup/install/files/lib/system/condition/article/ArticleCategoryCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/article/ArticleCategoryCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition\article;
 use wcf\data\article\ArticleList;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/condition/page/MultiPageCondition.class.php b/wcfsetup/install/files/lib/system/condition/page/MultiPageCondition.class.php
index 5722f2f0bd..07a649fab9 100644
--- a/wcfsetup/install/files/lib/system/condition/page/MultiPageCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/page/MultiPageCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition\page;
 use wcf\data\condition\Condition;
 use wcf\data\page\PageCache;
diff --git a/wcfsetup/install/files/lib/system/condition/user/activity/event/UserActivityEventExcludedObjectTypeCondition.class.php b/wcfsetup/install/files/lib/system/condition/user/activity/event/UserActivityEventExcludedObjectTypeCondition.class.php
index 699de1dc24..b35e344fe3 100644
--- a/wcfsetup/install/files/lib/system/condition/user/activity/event/UserActivityEventExcludedObjectTypeCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/user/activity/event/UserActivityEventExcludedObjectTypeCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition\user\activity\event;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\user\activity\event\UserActivityEventList;
diff --git a/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophiesCondition.class.php b/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophiesCondition.class.php
index 00f159d0b0..8599c54424 100644
--- a/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophiesCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophiesCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition\user\trophy;
 use wcf\data\trophy\TrophyCache;
 use wcf\data\user\trophy\UserTrophyList;
diff --git a/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophyCategoriesCondition.class.php b/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophyCategoriesCondition.class.php
index 0103bb66e1..f41ebc7a97 100644
--- a/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophyCategoriesCondition.class.php
+++ b/wcfsetup/install/files/lib/system/condition/user/trophy/UserTrophyExcludedTrophyCategoriesCondition.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\condition\user\trophy;
 use wcf\data\trophy\category\TrophyCategoryCache;
 use wcf\data\user\trophy\UserTrophyList;
diff --git a/wcfsetup/install/files/lib/system/cronjob/AbstractCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/AbstractCronjob.class.php
index bca6566873..bdb3b254c9 100644
--- a/wcfsetup/install/files/lib/system/cronjob/AbstractCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/AbstractCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/cronjob/ArticlePublicationCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/ArticlePublicationCronjob.class.php
index e188b67063..4dd5923c2c 100644
--- a/wcfsetup/install/files/lib/system/cronjob/ArticlePublicationCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/ArticlePublicationCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\article\Article;
 use wcf\data\article\ArticleAction;
diff --git a/wcfsetup/install/files/lib/system/cronjob/AssignTrophiesCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/AssignTrophiesCronjob.class.php
index db5391a39a..8bbda21fa7 100644
--- a/wcfsetup/install/files/lib/system/cronjob/AssignTrophiesCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/AssignTrophiesCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\trophy\condition\TrophyConditionHandler;
diff --git a/wcfsetup/install/files/lib/system/cronjob/AttachmentCleanUpCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/AttachmentCleanUpCronjob.class.php
index f91bcb659b..fe998f3020 100644
--- a/wcfsetup/install/files/lib/system/cronjob/AttachmentCleanUpCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/AttachmentCleanUpCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\attachment\AttachmentEditor;
 use wcf\data\cronjob\Cronjob;
diff --git a/wcfsetup/install/files/lib/system/cronjob/BackgroundQueueCleanUpCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/BackgroundQueueCleanUpCronjob.class.php
index f2421ae2ea..fef35f594c 100644
--- a/wcfsetup/install/files/lib/system/cronjob/BackgroundQueueCleanUpCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/BackgroundQueueCleanUpCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\background\BackgroundQueueHandler;
diff --git a/wcfsetup/install/files/lib/system/cronjob/CronjobScheduler.class.php b/wcfsetup/install/files/lib/system/cronjob/CronjobScheduler.class.php
index 6c53a44493..b640f6228c 100644
--- a/wcfsetup/install/files/lib/system/cronjob/CronjobScheduler.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/CronjobScheduler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\log\CronjobLogEditor;
 use wcf\data\cronjob\Cronjob;
diff --git a/wcfsetup/install/files/lib/system/cronjob/DailyCleanUpCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/DailyCleanUpCronjob.class.php
index 190cc69053..d5f11f86da 100644
--- a/wcfsetup/install/files/lib/system/cronjob/DailyCleanUpCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/DailyCleanUpCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/cronjob/DailyMailNotificationCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/DailyMailNotificationCronjob.class.php
index fb78d2544c..e2fc5ee7b0 100644
--- a/wcfsetup/install/files/lib/system/cronjob/DailyMailNotificationCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/DailyMailNotificationCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\user\notification\event\UserNotificationEventList;
diff --git a/wcfsetup/install/files/lib/system/cronjob/ExpiringPaidSubscriptionUserCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/ExpiringPaidSubscriptionUserCronjob.class.php
index 5dc08128d9..47c38d6cb6 100644
--- a/wcfsetup/install/files/lib/system/cronjob/ExpiringPaidSubscriptionUserCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/ExpiringPaidSubscriptionUserCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserEditor;
diff --git a/wcfsetup/install/files/lib/system/cronjob/GetUpdateInfoCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/GetUpdateInfoCronjob.class.php
index 83359f397a..13b28f2a96 100644
--- a/wcfsetup/install/files/lib/system/cronjob/GetUpdateInfoCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/GetUpdateInfoCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\package\PackageUpdateDispatcher;
diff --git a/wcfsetup/install/files/lib/system/cronjob/HourlyCleanUpCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/HourlyCleanUpCronjob.class.php
index 6ed2793947..ce66e735d4 100644
--- a/wcfsetup/install/files/lib/system/cronjob/HourlyCleanUpCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/HourlyCleanUpCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserAction;
diff --git a/wcfsetup/install/files/lib/system/cronjob/ICronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/ICronjob.class.php
index ba13aa5ee7..ef95bf677e 100644
--- a/wcfsetup/install/files/lib/system/cronjob/ICronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/ICronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 
diff --git a/wcfsetup/install/files/lib/system/cronjob/LastActivityCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/LastActivityCronjob.class.php
index 65f72f97fe..6e3d4d5924 100644
--- a/wcfsetup/install/files/lib/system/cronjob/LastActivityCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/LastActivityCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cronjob/ModerationQueueCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/ModerationQueueCronjob.class.php
index fb936cea00..61b5e96c9d 100644
--- a/wcfsetup/install/files/lib/system/cronjob/ModerationQueueCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/ModerationQueueCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\moderation\queue\ModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/cronjob/RebuildSitemapCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/RebuildSitemapCronjob.class.php
index 5adcee0078..a15d01160e 100755
--- a/wcfsetup/install/files/lib/system/cronjob/RebuildSitemapCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/RebuildSitemapCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\worker\SitemapRebuildWorker;
diff --git a/wcfsetup/install/files/lib/system/cronjob/RefreshSearchRobotsCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/RefreshSearchRobotsCronjob.class.php
index db46dcb84c..2d106577df 100644
--- a/wcfsetup/install/files/lib/system/cronjob/RefreshSearchRobotsCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/RefreshSearchRobotsCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\cache\builder\SpiderCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/cronjob/SessionCleanUpCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/SessionCleanUpCronjob.class.php
index cd36e70226..c7930c13ee 100644
--- a/wcfsetup/install/files/lib/system/cronjob/SessionCleanUpCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/SessionCleanUpCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\acp\session\virtual\ACPSessionVirtualEditor;
 use wcf\data\acp\session\ACPSessionEditor;
diff --git a/wcfsetup/install/files/lib/system/cronjob/StatDailyBuilderCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/StatDailyBuilderCronjob.class.php
index 683336c85f..8d71ebc47b 100644
--- a/wcfsetup/install/files/lib/system/cronjob/StatDailyBuilderCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/StatDailyBuilderCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/cronjob/UserBanCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/UserBanCronjob.class.php
index 7e68c17880..ddf1fe31d6 100644
--- a/wcfsetup/install/files/lib/system/cronjob/UserBanCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/UserBanCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/cronjob/UserGroupAssignmentCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/UserGroupAssignmentCronjob.class.php
index 8ce4230920..071ac89472 100644
--- a/wcfsetup/install/files/lib/system/cronjob/UserGroupAssignmentCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/UserGroupAssignmentCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/system/cronjob/UserQuitCronjob.class.php b/wcfsetup/install/files/lib/system/cronjob/UserQuitCronjob.class.php
index b45b616645..7899ab079b 100644
--- a/wcfsetup/install/files/lib/system/cronjob/UserQuitCronjob.class.php
+++ b/wcfsetup/install/files/lib/system/cronjob/UserQuitCronjob.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\cronjob;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/system/database/Database.class.php b/wcfsetup/install/files/lib/system/database/Database.class.php
index 9255f2a0ad..de2396239f 100644
--- a/wcfsetup/install/files/lib/system/database/Database.class.php
+++ b/wcfsetup/install/files/lib/system/database/Database.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database;
 use wcf\system\benchmark\Benchmark;
 use wcf\system\database\editor\DatabaseEditor;
diff --git a/wcfsetup/install/files/lib/system/database/DatabaseException.class.php b/wcfsetup/install/files/lib/system/database/DatabaseException.class.php
index 49c249dece..f2f08a459f 100644
--- a/wcfsetup/install/files/lib/system/database/DatabaseException.class.php
+++ b/wcfsetup/install/files/lib/system/database/DatabaseException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database;
 use wcf\system\database\statement\PreparedStatement;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/database/MySQLDatabase.class.php b/wcfsetup/install/files/lib/system/database/MySQLDatabase.class.php
index a18473221c..7fc3674e76 100644
--- a/wcfsetup/install/files/lib/system/database/MySQLDatabase.class.php
+++ b/wcfsetup/install/files/lib/system/database/MySQLDatabase.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database;
 use wcf\system\database\editor\MySQLDatabaseEditor;
 use wcf\system\database\exception\DatabaseException as GenericDatabaseException;
diff --git a/wcfsetup/install/files/lib/system/database/Redis.class.php b/wcfsetup/install/files/lib/system/database/Redis.class.php
index 38efc4f8f9..da08401e43 100644
--- a/wcfsetup/install/files/lib/system/database/Redis.class.php
+++ b/wcfsetup/install/files/lib/system/database/Redis.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database;
 use wcf\system\Regex;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/database/editor/DatabaseEditor.class.php b/wcfsetup/install/files/lib/system/database/editor/DatabaseEditor.class.php
index 53322443bb..dc4a047dfc 100644
--- a/wcfsetup/install/files/lib/system/database/editor/DatabaseEditor.class.php
+++ b/wcfsetup/install/files/lib/system/database/editor/DatabaseEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\editor;
 use wcf\system\database\Database;
 
diff --git a/wcfsetup/install/files/lib/system/database/editor/MySQLDatabaseEditor.class.php b/wcfsetup/install/files/lib/system/database/editor/MySQLDatabaseEditor.class.php
index b0a52572e9..ccb1e75bb0 100644
--- a/wcfsetup/install/files/lib/system/database/editor/MySQLDatabaseEditor.class.php
+++ b/wcfsetup/install/files/lib/system/database/editor/MySQLDatabaseEditor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\editor;
 use wcf\system\Regex;
 
diff --git a/wcfsetup/install/files/lib/system/database/exception/DatabaseException.class.php b/wcfsetup/install/files/lib/system/database/exception/DatabaseException.class.php
index 5c857a1418..a269664950 100644
--- a/wcfsetup/install/files/lib/system/database/exception/DatabaseException.class.php
+++ b/wcfsetup/install/files/lib/system/database/exception/DatabaseException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryException.class.php b/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryException.class.php
index 9a8b1ee02c..0638de4446 100644
--- a/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryException.class.php
+++ b/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryExecutionException.class.php b/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryExecutionException.class.php
index 0477d801ea..7580b5ebb9 100644
--- a/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryExecutionException.class.php
+++ b/wcfsetup/install/files/lib/system/database/exception/DatabaseQueryExecutionException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\exception;
 use wcf\system\exception\IExtraInformationException;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/database/exception/DatabaseTransactionException.class.php b/wcfsetup/install/files/lib/system/database/exception/DatabaseTransactionException.class.php
index b2aef34e0c..b2b9bcedc7 100644
--- a/wcfsetup/install/files/lib/system/database/exception/DatabaseTransactionException.class.php
+++ b/wcfsetup/install/files/lib/system/database/exception/DatabaseTransactionException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/database/statement/PreparedStatement.class.php b/wcfsetup/install/files/lib/system/database/statement/PreparedStatement.class.php
index f82f0b5583..8e069fc844 100644
--- a/wcfsetup/install/files/lib/system/database/statement/PreparedStatement.class.php
+++ b/wcfsetup/install/files/lib/system/database/statement/PreparedStatement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\statement;
 use wcf\data\DatabaseObject;
 use wcf\system\benchmark\Benchmark;
diff --git a/wcfsetup/install/files/lib/system/database/util/ConditionBuilder.class.php b/wcfsetup/install/files/lib/system/database/util/ConditionBuilder.class.php
index 12de2047cb..5be3ec58d1 100644
--- a/wcfsetup/install/files/lib/system/database/util/ConditionBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/database/util/ConditionBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/database/util/PreparedStatementConditionBuilder.class.php b/wcfsetup/install/files/lib/system/database/util/PreparedStatementConditionBuilder.class.php
index 0a884cccf0..6655926712 100644
--- a/wcfsetup/install/files/lib/system/database/util/PreparedStatementConditionBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/database/util/PreparedStatementConditionBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/database/util/SQLParser.class.php b/wcfsetup/install/files/lib/system/database/util/SQLParser.class.php
index 8ab1c840a7..2877c35718 100644
--- a/wcfsetup/install/files/lib/system/database/util/SQLParser.class.php
+++ b/wcfsetup/install/files/lib/system/database/util/SQLParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\database\util;
 use wcf\system\exception\SystemException;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/devtools/DevtoolsSetup.class.php b/wcfsetup/install/files/lib/system/devtools/DevtoolsSetup.class.php
index 1860e6a65c..03fee45670 100644
--- a/wcfsetup/install/files/lib/system/devtools/DevtoolsSetup.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/DevtoolsSetup.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools;
 use wcf\system\SingletonFactory;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsInstaller.class.php b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsInstaller.class.php
index f034dee165..a9ad638930 100644
--- a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsInstaller.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsInstaller.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\package;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\system\setup\Installer;
diff --git a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php
index 2a60f8a514..08bcfc125e 100644
--- a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsPackageArchive.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\package;
 use wcf\system\package\PackageArchive;
 
diff --git a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php
index 50caa3a608..f39c48a47a 100644
--- a/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/package/DevtoolsTar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\package;
 use wcf\system\io\Tar;
 
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php
index 422390c442..4c31c6fe8f 100644
--- a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationDispatcher.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\pip;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\system\devtools\package\DevtoolsInstaller;
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php
index 049678df34..442da9704e 100644
--- a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPackageInstallationQueue.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\pip;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php
index 1f7a52c744..1bebcc847a 100644
--- a/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/pip/DevtoolsPip.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\pip;
 use wcf\data\devtools\project\DevtoolsProject;
 use wcf\data\package\installation\plugin\PackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php
index 5ad65569fd..a94645fecc 100644
--- a/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/devtools/pip/IIdempotentPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\devtools\pip;
 use wcf\system\package\plugin\IPackageInstallationPlugin;
 
diff --git a/wcfsetup/install/files/lib/system/edit/EditHistoryManager.class.php b/wcfsetup/install/files/lib/system/edit/EditHistoryManager.class.php
index 77792bdea7..75c6b85b2d 100644
--- a/wcfsetup/install/files/lib/system/edit/EditHistoryManager.class.php
+++ b/wcfsetup/install/files/lib/system/edit/EditHistoryManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\edit;
 use wcf\data\edit\history\entry\EditHistoryEntryList;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/edit/IHistorySavingObject.class.php b/wcfsetup/install/files/lib/system/edit/IHistorySavingObject.class.php
index 8d5c9aecad..f28ea2fd22 100644
--- a/wcfsetup/install/files/lib/system/edit/IHistorySavingObject.class.php
+++ b/wcfsetup/install/files/lib/system/edit/IHistorySavingObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\edit;
 use wcf\data\edit\history\entry\EditHistoryEntry;
 use wcf\data\IDatabaseObjectProcessor;
diff --git a/wcfsetup/install/files/lib/system/edit/IHistorySavingObjectTypeProvider.class.php b/wcfsetup/install/files/lib/system/edit/IHistorySavingObjectTypeProvider.class.php
index 1c4e5b2e9c..f027baa79a 100644
--- a/wcfsetup/install/files/lib/system/edit/IHistorySavingObjectTypeProvider.class.php
+++ b/wcfsetup/install/files/lib/system/edit/IHistorySavingObjectTypeProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\edit;
 use wcf\data\object\type\IObjectTypeProvider;
 use wcf\system\exception\PermissionDeniedException;
diff --git a/wcfsetup/install/files/lib/system/email/Email.class.php b/wcfsetup/install/files/lib/system/email/Email.class.php
index 7fc44c6651..76b76bfc72 100644
--- a/wcfsetup/install/files/lib/system/email/Email.class.php
+++ b/wcfsetup/install/files/lib/system/email/Email.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\background\job\AbstractBackgroundJob;
diff --git a/wcfsetup/install/files/lib/system/email/EmailGrammar.class.php b/wcfsetup/install/files/lib/system/email/EmailGrammar.class.php
index 25c08d7503..4c650019cb 100644
--- a/wcfsetup/install/files/lib/system/email/EmailGrammar.class.php
+++ b/wcfsetup/install/files/lib/system/email/EmailGrammar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/Mailbox.class.php b/wcfsetup/install/files/lib/system/email/Mailbox.class.php
index a680cb825c..9529a09156 100644
--- a/wcfsetup/install/files/lib/system/email/Mailbox.class.php
+++ b/wcfsetup/install/files/lib/system/email/Mailbox.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email;
 use TrueBV\Punycode;
 use wcf\data\language\Language;
diff --git a/wcfsetup/install/files/lib/system/email/SimpleEmail.class.php b/wcfsetup/install/files/lib/system/email/SimpleEmail.class.php
index e8c8ff845b..13b5ada24b 100644
--- a/wcfsetup/install/files/lib/system/email/SimpleEmail.class.php
+++ b/wcfsetup/install/files/lib/system/email/SimpleEmail.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email;
 use wcf\data\user\User;
 use wcf\system\email\mime\HtmlTextMimePart;
diff --git a/wcfsetup/install/files/lib/system/email/UserMailbox.class.php b/wcfsetup/install/files/lib/system/email/UserMailbox.class.php
index 452dce2d91..5a5d70d043 100644
--- a/wcfsetup/install/files/lib/system/email/UserMailbox.class.php
+++ b/wcfsetup/install/files/lib/system/email/UserMailbox.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email;
 use wcf\data\user\User;
 
diff --git a/wcfsetup/install/files/lib/system/email/mime/AbstractMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/AbstractMimePart.class.php
index e28ac9135d..c9750a6bec 100644
--- a/wcfsetup/install/files/lib/system/email/mime/AbstractMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/AbstractMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/mime/AbstractMultipartMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/AbstractMultipartMimePart.class.php
index 9deabc4650..52f8b5097d 100644
--- a/wcfsetup/install/files/lib/system/email/mime/AbstractMultipartMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/AbstractMultipartMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 use wcf\system\email\Mailbox;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/email/mime/AttachmentMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/AttachmentMimePart.class.php
index 091dea3a2b..f2c1251802 100644
--- a/wcfsetup/install/files/lib/system/email/mime/AttachmentMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/AttachmentMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 use wcf\util\FileUtil;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/email/mime/HtmlTextMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/HtmlTextMimePart.class.php
index f911562e89..2ae4a40255 100644
--- a/wcfsetup/install/files/lib/system/email/mime/HtmlTextMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/HtmlTextMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/mime/IRecipientAwareMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/IRecipientAwareMimePart.class.php
index 1637ec5444..835f12fe6d 100644
--- a/wcfsetup/install/files/lib/system/email/mime/IRecipientAwareMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/IRecipientAwareMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 use wcf\system\email\Mailbox;
 
diff --git a/wcfsetup/install/files/lib/system/email/mime/MimePartFacade.class.php b/wcfsetup/install/files/lib/system/email/mime/MimePartFacade.class.php
index 947058e475..f47bdc1f6a 100644
--- a/wcfsetup/install/files/lib/system/email/mime/MimePartFacade.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/MimePartFacade.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 use wcf\system\email\Mailbox;
 
diff --git a/wcfsetup/install/files/lib/system/email/mime/MultipartAlternativeMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/MultipartAlternativeMimePart.class.php
index 9197e150d9..854a63b9be 100644
--- a/wcfsetup/install/files/lib/system/email/mime/MultipartAlternativeMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/MultipartAlternativeMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/mime/MultipartMixedMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/MultipartMixedMimePart.class.php
index 552df109bc..a441beb251 100644
--- a/wcfsetup/install/files/lib/system/email/mime/MultipartMixedMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/MultipartMixedMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/mime/PlainTextMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/PlainTextMimePart.class.php
index 65235d6b17..9d047d6ffc 100644
--- a/wcfsetup/install/files/lib/system/email/mime/PlainTextMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/PlainTextMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/mime/RecipientAwareTextMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/RecipientAwareTextMimePart.class.php
index ed797bdebb..f548b86adf 100644
--- a/wcfsetup/install/files/lib/system/email/mime/RecipientAwareTextMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/RecipientAwareTextMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 use Pelago\Emogrifier;
 use wcf\data\style\ActiveStyle;
diff --git a/wcfsetup/install/files/lib/system/email/mime/TextMimePart.class.php b/wcfsetup/install/files/lib/system/email/mime/TextMimePart.class.php
index 15c3311d30..76e7092ff9 100644
--- a/wcfsetup/install/files/lib/system/email/mime/TextMimePart.class.php
+++ b/wcfsetup/install/files/lib/system/email/mime/TextMimePart.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\mime;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/transport/DebugEmailTransport.class.php b/wcfsetup/install/files/lib/system/email/transport/DebugEmailTransport.class.php
index aea4fa53d6..8b2a6082ac 100644
--- a/wcfsetup/install/files/lib/system/email/transport/DebugEmailTransport.class.php
+++ b/wcfsetup/install/files/lib/system/email/transport/DebugEmailTransport.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\transport;
 use wcf\system\email\Email;
 use wcf\system\email\Mailbox;
diff --git a/wcfsetup/install/files/lib/system/email/transport/IEmailTransport.class.php b/wcfsetup/install/files/lib/system/email/transport/IEmailTransport.class.php
index 94cd5064ec..f1c073710b 100644
--- a/wcfsetup/install/files/lib/system/email/transport/IEmailTransport.class.php
+++ b/wcfsetup/install/files/lib/system/email/transport/IEmailTransport.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\transport;
 use wcf\system\email\Email;
 use wcf\system\email\Mailbox;
diff --git a/wcfsetup/install/files/lib/system/email/transport/PhpEmailTransport.class.php b/wcfsetup/install/files/lib/system/email/transport/PhpEmailTransport.class.php
index 932753168f..775f29b9af 100644
--- a/wcfsetup/install/files/lib/system/email/transport/PhpEmailTransport.class.php
+++ b/wcfsetup/install/files/lib/system/email/transport/PhpEmailTransport.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\transport;
 use wcf\system\email\transport\exception\TransientFailure;
 use wcf\system\email\Email;
diff --git a/wcfsetup/install/files/lib/system/email/transport/SmtpEmailTransport.class.php b/wcfsetup/install/files/lib/system/email/transport/SmtpEmailTransport.class.php
index 7cedc34430..3e8a5d4fbd 100644
--- a/wcfsetup/install/files/lib/system/email/transport/SmtpEmailTransport.class.php
+++ b/wcfsetup/install/files/lib/system/email/transport/SmtpEmailTransport.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\transport;
 use wcf\system\email\transport\exception\PermanentFailure;
 use wcf\system\email\transport\exception\TransientFailure;
diff --git a/wcfsetup/install/files/lib/system/email/transport/exception/PermanentFailure.class.php b/wcfsetup/install/files/lib/system/email/transport/exception/PermanentFailure.class.php
index 15c369be28..61e35a86d5 100644
--- a/wcfsetup/install/files/lib/system/email/transport/exception/PermanentFailure.class.php
+++ b/wcfsetup/install/files/lib/system/email/transport/exception/PermanentFailure.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\transport\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/email/transport/exception/TransientFailure.class.php b/wcfsetup/install/files/lib/system/email/transport/exception/TransientFailure.class.php
index e6edaa5b71..26ccddff51 100644
--- a/wcfsetup/install/files/lib/system/email/transport/exception/TransientFailure.class.php
+++ b/wcfsetup/install/files/lib/system/email/transport/exception/TransientFailure.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\email\transport\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/event/EventHandler.class.php b/wcfsetup/install/files/lib/system/event/EventHandler.class.php
index ba7dbd260e..f81361cd48 100644
--- a/wcfsetup/install/files/lib/system/event/EventHandler.class.php
+++ b/wcfsetup/install/files/lib/system/event/EventHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event;
 use wcf\data\event\listener\EventListener;
 use wcf\system\cache\builder\EventListenerCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/event/IEventListener.class.php b/wcfsetup/install/files/lib/system/event/IEventListener.class.php
index b69749d937..bf26b3610b 100644
--- a/wcfsetup/install/files/lib/system/event/IEventListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/IEventListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php b/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php
index b23243851c..26797ada31 100644
--- a/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event\listener;
 use wcf\data\DatabaseObjectDecorator;
 use wcf\data\ITitledObject;
diff --git a/wcfsetup/install/files/lib/system/event/listener/AbstractUserActionRenameListener.class.php b/wcfsetup/install/files/lib/system/event/listener/AbstractUserActionRenameListener.class.php
index 6eac955ac6..5ee1a7f560 100644
--- a/wcfsetup/install/files/lib/system/event/listener/AbstractUserActionRenameListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/listener/AbstractUserActionRenameListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event\listener;
 use wcf\data\user\UserAction;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/event/listener/AbstractUserMergeListener.class.php b/wcfsetup/install/files/lib/system/event/listener/AbstractUserMergeListener.class.php
index 149da44c18..b465cfe1aa 100644
--- a/wcfsetup/install/files/lib/system/event/listener/AbstractUserMergeListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/listener/AbstractUserMergeListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event\listener;
 use wcf\acp\form\UserMergeForm;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/event/listener/ArticleLinkHtmlInputNodeProcessorListener.class.php b/wcfsetup/install/files/lib/system/event/listener/ArticleLinkHtmlInputNodeProcessorListener.class.php
index 06e16d7505..b7c8b1f62c 100644
--- a/wcfsetup/install/files/lib/system/event/listener/ArticleLinkHtmlInputNodeProcessorListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/listener/ArticleLinkHtmlInputNodeProcessorListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event\listener;
 use wcf\data\article\content\ArticleContentList;
 use wcf\data\article\AccessibleArticleList;
diff --git a/wcfsetup/install/files/lib/system/event/listener/IParameterizedEventListener.class.php b/wcfsetup/install/files/lib/system/event/listener/IParameterizedEventListener.class.php
index 0fc4e13c64..dc3dced272 100644
--- a/wcfsetup/install/files/lib/system/event/listener/IParameterizedEventListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/listener/IParameterizedEventListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event\listener;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/event/listener/SessionAccessLogListener.class.php b/wcfsetup/install/files/lib/system/event/listener/SessionAccessLogListener.class.php
index 4b1c815ad5..e6092d01f1 100644
--- a/wcfsetup/install/files/lib/system/event/listener/SessionAccessLogListener.class.php
+++ b/wcfsetup/install/files/lib/system/event/listener/SessionAccessLogListener.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\event\listener;
 use wcf\data\acp\session\access\log\ACPSessionAccessLogEditor;
 use wcf\data\acp\session\log\ACPSessionLog;
diff --git a/wcfsetup/install/files/lib/system/exception/AJAXException.class.php b/wcfsetup/install/files/lib/system/exception/AJAXException.class.php
index 6ae37a0bdd..6f5399df5b 100644
--- a/wcfsetup/install/files/lib/system/exception/AJAXException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/AJAXException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\WCF;
 use wcf\util\JSON;
diff --git a/wcfsetup/install/files/lib/system/exception/ErrorException.class.php b/wcfsetup/install/files/lib/system/exception/ErrorException.class.php
index 3ab2cec9a6..4cd1582f19 100644
--- a/wcfsetup/install/files/lib/system/exception/ErrorException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/ErrorException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/HTTPNotFoundException.class.php b/wcfsetup/install/files/lib/system/exception/HTTPNotFoundException.class.php
index fe28abd330..b070208072 100644
--- a/wcfsetup/install/files/lib/system/exception/HTTPNotFoundException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/HTTPNotFoundException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/HTTPServerErrorException.class.php b/wcfsetup/install/files/lib/system/exception/HTTPServerErrorException.class.php
index dcb4111c9c..a1f5646990 100644
--- a/wcfsetup/install/files/lib/system/exception/HTTPServerErrorException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/HTTPServerErrorException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/HTTPUnauthorizedException.class.php b/wcfsetup/install/files/lib/system/exception/HTTPUnauthorizedException.class.php
index cfd936b222..ba3599af2c 100644
--- a/wcfsetup/install/files/lib/system/exception/HTTPUnauthorizedException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/HTTPUnauthorizedException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/IExtraInformationException.class.php b/wcfsetup/install/files/lib/system/exception/IExtraInformationException.class.php
index 8145ce8d0d..c6251951f3 100644
--- a/wcfsetup/install/files/lib/system/exception/IExtraInformationException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/IExtraInformationException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/IPrintableException.class.php b/wcfsetup/install/files/lib/system/exception/IPrintableException.class.php
index 3187ae707e..dd8952c729 100644
--- a/wcfsetup/install/files/lib/system/exception/IPrintableException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/IPrintableException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/IllegalLinkException.class.php b/wcfsetup/install/files/lib/system/exception/IllegalLinkException.class.php
index 87a035caf2..d3ed444b50 100644
--- a/wcfsetup/install/files/lib/system/exception/IllegalLinkException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/IllegalLinkException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/exception/ImplementationException.class.php b/wcfsetup/install/files/lib/system/exception/ImplementationException.class.php
index dbaf332f6a..38f758cd39 100644
--- a/wcfsetup/install/files/lib/system/exception/ImplementationException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/ImplementationException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/InvalidObjectTypeException.class.php b/wcfsetup/install/files/lib/system/exception/InvalidObjectTypeException.class.php
index 5ed9170fd2..06ad4e4979 100644
--- a/wcfsetup/install/files/lib/system/exception/InvalidObjectTypeException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/InvalidObjectTypeException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/InvalidSecurityTokenException.class.php b/wcfsetup/install/files/lib/system/exception/InvalidSecurityTokenException.class.php
index d6fe45a638..a19eac4d4d 100644
--- a/wcfsetup/install/files/lib/system/exception/InvalidSecurityTokenException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/InvalidSecurityTokenException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/exception/LoggedException.class.php b/wcfsetup/install/files/lib/system/exception/LoggedException.class.php
index 8de3f0ba42..c18e13ed73 100644
--- a/wcfsetup/install/files/lib/system/exception/LoggedException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/LoggedException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 // @codingStandardsIgnoreFile
 
diff --git a/wcfsetup/install/files/lib/system/exception/NamedUserException.class.php b/wcfsetup/install/files/lib/system/exception/NamedUserException.class.php
index de369d295d..a2ba74f1ad 100644
--- a/wcfsetup/install/files/lib/system/exception/NamedUserException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/NamedUserException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\box\BoxHandler;
 use wcf\system\session\SessionHandler;
diff --git a/wcfsetup/install/files/lib/system/exception/NotImplementedException.class.php b/wcfsetup/install/files/lib/system/exception/NotImplementedException.class.php
index d7d4e9d2c2..9f430bb283 100644
--- a/wcfsetup/install/files/lib/system/exception/NotImplementedException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/NotImplementedException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/ParentClassException.class.php b/wcfsetup/install/files/lib/system/exception/ParentClassException.class.php
index 0661377006..afd9c6d8ba 100644
--- a/wcfsetup/install/files/lib/system/exception/ParentClassException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/ParentClassException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/PermissionDeniedException.class.php b/wcfsetup/install/files/lib/system/exception/PermissionDeniedException.class.php
index 8ee7912e43..e9d6b71e46 100644
--- a/wcfsetup/install/files/lib/system/exception/PermissionDeniedException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/PermissionDeniedException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\box\BoxHandler;
 use wcf\system\notice\NoticeHandler;
diff --git a/wcfsetup/install/files/lib/system/exception/SystemException.class.php b/wcfsetup/install/files/lib/system/exception/SystemException.class.php
index 669e8af6ed..cad0d60348 100644
--- a/wcfsetup/install/files/lib/system/exception/SystemException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/SystemException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/UserException.class.php b/wcfsetup/install/files/lib/system/exception/UserException.class.php
index e49b71d5c4..2373a28ad9 100644
--- a/wcfsetup/install/files/lib/system/exception/UserException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/UserException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/exception/UserInputException.class.php b/wcfsetup/install/files/lib/system/exception/UserInputException.class.php
index ae8fb93bbb..4ad26c6850 100644
--- a/wcfsetup/install/files/lib/system/exception/UserInputException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/UserInputException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/exception/ValidateActionException.class.php b/wcfsetup/install/files/lib/system/exception/ValidateActionException.class.php
index 6fb39d2364..d410642399 100644
--- a/wcfsetup/install/files/lib/system/exception/ValidateActionException.class.php
+++ b/wcfsetup/install/files/lib/system/exception/ValidateActionException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exception;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/exporter/AbstractExporter.class.php b/wcfsetup/install/files/lib/system/exporter/AbstractExporter.class.php
index 40a535c7f7..0a68fad95b 100644
--- a/wcfsetup/install/files/lib/system/exporter/AbstractExporter.class.php
+++ b/wcfsetup/install/files/lib/system/exporter/AbstractExporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exporter;
 use wcf\system\database\MySQLDatabase;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/exporter/IExporter.class.php b/wcfsetup/install/files/lib/system/exporter/IExporter.class.php
index a9988e8d17..1c52007306 100644
--- a/wcfsetup/install/files/lib/system/exporter/IExporter.class.php
+++ b/wcfsetup/install/files/lib/system/exporter/IExporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\exporter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/feed/enclosure/FeedEnclosure.class.php b/wcfsetup/install/files/lib/system/feed/enclosure/FeedEnclosure.class.php
index 3cba950156..543a807721 100644
--- a/wcfsetup/install/files/lib/system/feed/enclosure/FeedEnclosure.class.php
+++ b/wcfsetup/install/files/lib/system/feed/enclosure/FeedEnclosure.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\feed\enclosure;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/form/FormDocument.class.php b/wcfsetup/install/files/lib/system/form/FormDocument.class.php
index f77ef04b35..1740af7716 100644
--- a/wcfsetup/install/files/lib/system/form/FormDocument.class.php
+++ b/wcfsetup/install/files/lib/system/form/FormDocument.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/form/IFormElement.class.php b/wcfsetup/install/files/lib/system/form/IFormElement.class.php
index fc742c6b8d..a068b58eec 100644
--- a/wcfsetup/install/files/lib/system/form/IFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/IFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/form/IFormElementContainer.class.php b/wcfsetup/install/files/lib/system/form/IFormElementContainer.class.php
index fb24e2c276..3f23575dbd 100644
--- a/wcfsetup/install/files/lib/system/form/IFormElementContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/IFormElementContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/form/container/AbstractFormElementContainer.class.php b/wcfsetup/install/files/lib/system/form/container/AbstractFormElementContainer.class.php
index 7451aa5510..d61bf3d3eb 100644
--- a/wcfsetup/install/files/lib/system/form/container/AbstractFormElementContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/container/AbstractFormElementContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\container;
 use wcf\system\form\element\AbstractNamedFormElement;
 use wcf\system\form\IFormElement;
diff --git a/wcfsetup/install/files/lib/system/form/container/GroupFormElementContainer.class.php b/wcfsetup/install/files/lib/system/form/container/GroupFormElementContainer.class.php
index ada4bed65d..45658c5b36 100644
--- a/wcfsetup/install/files/lib/system/form/container/GroupFormElementContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/container/GroupFormElementContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\container;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/form/container/MultipleSelectionFormElementContainer.class.php b/wcfsetup/install/files/lib/system/form/container/MultipleSelectionFormElementContainer.class.php
index dd908b1a9a..461132644d 100644
--- a/wcfsetup/install/files/lib/system/form/container/MultipleSelectionFormElementContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/container/MultipleSelectionFormElementContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\container;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/form/container/SelectionFormElementContainer.class.php b/wcfsetup/install/files/lib/system/form/container/SelectionFormElementContainer.class.php
index 357cd28cef..d9657e12c7 100644
--- a/wcfsetup/install/files/lib/system/form/container/SelectionFormElementContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/container/SelectionFormElementContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\container;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/form/container/SingleSelectionFormElementContainer.class.php b/wcfsetup/install/files/lib/system/form/container/SingleSelectionFormElementContainer.class.php
index 6f9cfcc03f..61f4a54d2e 100644
--- a/wcfsetup/install/files/lib/system/form/container/SingleSelectionFormElementContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/container/SingleSelectionFormElementContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\container;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/form/element/AbstractFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/AbstractFormElement.class.php
index 6cc41b89fd..2f3ce00519 100644
--- a/wcfsetup/install/files/lib/system/form/element/AbstractFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/AbstractFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 use wcf\system\form\IFormElement;
 use wcf\system\form\IFormElementContainer;
diff --git a/wcfsetup/install/files/lib/system/form/element/AbstractNamedFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/AbstractNamedFormElement.class.php
index 971214f7b4..b9da24d4f6 100644
--- a/wcfsetup/install/files/lib/system/form/element/AbstractNamedFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/AbstractNamedFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/form/element/LabelFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/LabelFormElement.class.php
index f2abe13cce..21940101a4 100644
--- a/wcfsetup/install/files/lib/system/form/element/LabelFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/LabelFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/form/element/MultipleSelectionFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/MultipleSelectionFormElement.class.php
index f4527a889a..d0172be1b4 100644
--- a/wcfsetup/install/files/lib/system/form/element/MultipleSelectionFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/MultipleSelectionFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 use wcf\system\form\container\MultipleSelectionFormElementContainer;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/form/element/PasswordInputFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/PasswordInputFormElement.class.php
index 91c6b8ea73..28cc791c9d 100644
--- a/wcfsetup/install/files/lib/system/form/element/PasswordInputFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/PasswordInputFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/form/element/SingleSelectionFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/SingleSelectionFormElement.class.php
index 3cffd6d309..8475c71825 100644
--- a/wcfsetup/install/files/lib/system/form/element/SingleSelectionFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/SingleSelectionFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 use wcf\system\form\container\SingleSelectionFormElementContainer;
 
diff --git a/wcfsetup/install/files/lib/system/form/element/TextInputFormElement.class.php b/wcfsetup/install/files/lib/system/form/element/TextInputFormElement.class.php
index e505e45b11..dd31481ab6 100644
--- a/wcfsetup/install/files/lib/system/form/element/TextInputFormElement.class.php
+++ b/wcfsetup/install/files/lib/system/form/element/TextInputFormElement.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\form\element;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/AbstractHtmlProcessor.class.php b/wcfsetup/install/files/lib/system/html/AbstractHtmlProcessor.class.php
index f447b2f51a..3d629c4df0 100644
--- a/wcfsetup/install/files/lib/system/html/AbstractHtmlProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/AbstractHtmlProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\exception\InvalidObjectTypeException;
diff --git a/wcfsetup/install/files/lib/system/html/IHtmlProcessor.class.php b/wcfsetup/install/files/lib/system/html/IHtmlProcessor.class.php
index 2747ba8877..33f9bd1fb7 100644
--- a/wcfsetup/install/files/lib/system/html/IHtmlProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/IHtmlProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php b/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php
index d838a252c6..c7d40f1cf9 100644
--- a/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input;
 use wcf\system\bbcode\HtmlBBCodeParser;
 use wcf\system\html\input\filter\IHtmlInputFilter;
diff --git a/wcfsetup/install/files/lib/system/html/input/filter/HTMLPurifier_URIScheme_ts3server.php b/wcfsetup/install/files/lib/system/html/input/filter/HTMLPurifier_URIScheme_ts3server.php
index 6f0d1fa844..d93112810e 100644
--- a/wcfsetup/install/files/lib/system/html/input/filter/HTMLPurifier_URIScheme_ts3server.php
+++ b/wcfsetup/install/files/lib/system/html/input/filter/HTMLPurifier_URIScheme_ts3server.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 // @codingStandardsIgnoreFile
 /**
  * Teamspeak 3 direct join protocol
diff --git a/wcfsetup/install/files/lib/system/html/input/filter/IHtmlInputFilter.class.php b/wcfsetup/install/files/lib/system/html/input/filter/IHtmlInputFilter.class.php
index b4a298dec9..f0647f41de 100644
--- a/wcfsetup/install/files/lib/system/html/input/filter/IHtmlInputFilter.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/filter/IHtmlInputFilter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\filter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php b/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php
index 136575ccd5..31963dd7a3 100644
--- a/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\filter;
 use wcf\system\event\EventHandler;
 
diff --git a/wcfsetup/install/files/lib/system/html/input/node/AbstractHtmlInputNode.class.php b/wcfsetup/install/files/lib/system/html/input/node/AbstractHtmlInputNode.class.php
index 7f6bac22f4..fb226cea6a 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/AbstractHtmlInputNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/AbstractHtmlInputNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\html\node\AbstractHtmlNode;
 
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeImg.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeImg.class.php
index 24afe2789b..4f736b8185 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeImg.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeImg.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\data\smiley\Smiley;
 use wcf\data\smiley\SmileyCache;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeKbd.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeKbd.class.php
index b331c87851..dc57d027be 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeKbd.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeKbd.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
 use wcf\util\DOMUtil;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
index 00d2496853..8b57abb7c5 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\bbcode\BBCodeHandler;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeSpan.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeSpan.class.php
index fd2cc282b0..b18ae674be 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeSpan.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeSpan.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTable.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTable.class.php
index 935038f43b..1d55980d12 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTable.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTable.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
 use wcf\util\DOMUtil;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php
index 95c5ab7751..71d65502e9 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\data\bbcode\media\provider\BBCodeMediaProvider;
 use wcf\data\smiley\Smiley;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php
index adce53b268..1c9eb5d751 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\data\bbcode\BBCodeCache;
 use wcf\system\bbcode\BBCodeHandler;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php
index 02c58d5e0a..89e294843c 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\bbcode\BBCodeHandler;
 use wcf\system\bbcode\HtmlBBCodeParser;
diff --git a/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php b/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php
index ed996dad1b..2b90e0ffb2 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\input\node;
 use wcf\system\html\node\IHtmlNode;
 
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/AbstractMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/AbstractMetacodeConverter.class.php
index 9adbf59cca..d59f4be16e 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/AbstractMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/AbstractMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/CodeMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/CodeMetacodeConverter.class.php
index 6e06b599ab..59d3b14bbc 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/CodeMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/CodeMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\DOMUtil;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/ColorMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/ColorMetacodeConverter.class.php
index cf9d8e29e2..16e8919e63 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/ColorMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/ColorMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/FontMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/FontMetacodeConverter.class.php
index f9f82ec820..17967332d2 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/FontMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/FontMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/HtmlMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/HtmlMetacodeConverter.class.php
index 06e8153c03..72a01b5fcd 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/HtmlMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/HtmlMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\DOMUtil;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/IMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/IMetacodeConverter.class.php
index bd652202d4..f854871b3e 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/IMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/IMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/ImgMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/ImgMetacodeConverter.class.php
index 7d10e672f4..67d3dc03f8 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/ImgMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/ImgMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/ListMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/ListMetacodeConverter.class.php
index 484c16e27a..97be4e730b 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/ListMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/ListMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\DOMUtil;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/QuoteMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/QuoteMetacodeConverter.class.php
index d0df2135ec..4c1fa4315f 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/QuoteMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/QuoteMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/SizeMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/SizeMetacodeConverter.class.php
index d433c41641..25d95b431d 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/SizeMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/SizeMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/SpoilerMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/SpoilerMetacodeConverter.class.php
index 178a7ea817..f71ca37710 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/SpoilerMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/SpoilerMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/TableMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/TableMetacodeConverter.class.php
index 71e45cb91d..c3f95cead0 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/TableMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/TableMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\DOMUtil;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/html/metacode/converter/UrlMetacodeConverter.class.php b/wcfsetup/install/files/lib/system/html/metacode/converter/UrlMetacodeConverter.class.php
index 4e2ec3be9c..f5d9b3e99b 100644
--- a/wcfsetup/install/files/lib/system/html/metacode/converter/UrlMetacodeConverter.class.php
+++ b/wcfsetup/install/files/lib/system/html/metacode/converter/UrlMetacodeConverter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\metacode\converter;
 use wcf\util\StringUtil;
 
diff --git a/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNode.class.php b/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNode.class.php
index 0b54cf4d7d..1a51c75020 100644
--- a/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\node;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNodeProcessor.class.php
index 86563f448c..c7922a05c1 100644
--- a/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNodeProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/node/AbstractHtmlNodeProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\node;
 use wcf\system\exception\SystemException;
 use wcf\system\html\IHtmlProcessor;
diff --git a/wcfsetup/install/files/lib/system/html/node/IHtmlNode.class.php b/wcfsetup/install/files/lib/system/html/node/IHtmlNode.class.php
index 357c6624cd..02785df084 100644
--- a/wcfsetup/install/files/lib/system/html/node/IHtmlNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/node/IHtmlNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\node;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/html/node/IHtmlNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/node/IHtmlNodeProcessor.class.php
index d289df1931..fda35e13a9 100644
--- a/wcfsetup/install/files/lib/system/html/node/IHtmlNodeProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/node/IHtmlNodeProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\node;
 use wcf\system\html\IHtmlProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/html/output/AmpHtmlOutputProcessor.class.php b/wcfsetup/install/files/lib/system/html/output/AmpHtmlOutputProcessor.class.php
index 39afb5dc8f..cbefdd9773 100644
--- a/wcfsetup/install/files/lib/system/html/output/AmpHtmlOutputProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/AmpHtmlOutputProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output;
 use wcf\util\DOMUtil;
 
diff --git a/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php b/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php
index 55d1ca9f5a..5fe06d118a 100644
--- a/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output;
 use wcf\system\html\output\node\HtmlOutputNodeProcessor;
 use wcf\system\html\AbstractHtmlProcessor;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/AbstractHtmlOutputNode.class.php b/wcfsetup/install/files/lib/system/html/output/node/AbstractHtmlOutputNode.class.php
index acedc9e11a..029bcfc253 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/AbstractHtmlOutputNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/AbstractHtmlOutputNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\html\node\AbstractHtmlNode;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeA.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeA.class.php
index 50a45326de..f7701a9951 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeA.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeA.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeImg.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeImg.class.php
index fe0296b6ad..4689aa13bb 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeImg.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeImg.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\data\smiley\Smiley;
 use wcf\data\smiley\SmileyCache;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodePre.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodePre.class.php
index b47e0e8901..68cc38d3dc 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodePre.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodePre.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\bbcode\highlighter\BashHighlighter;
 use wcf\system\bbcode\highlighter\CHighlighter;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeProcessor.class.php
index 33f1ec117f..dac3ea1519 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeProcessor.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\bbcode\HtmlBBCodeParser;
 use wcf\system\bbcode\KeywordHighlighter;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeTable.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeTable.class.php
index e14cdbe57b..1564c8daf4 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeTable.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeTable.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMetacode.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMetacode.class.php
index be63c3bcce..01423c7b0c 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMetacode.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMetacode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\bbcode\HtmlBBCodeParser;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabQuote.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabQuote.class.php
index 23e1fce895..6b5da064d2 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabQuote.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabQuote.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabSpoiler.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabSpoiler.class.php
index b577226073..97773a28af 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabSpoiler.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabSpoiler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\html\node\AbstractHtmlNodeProcessor;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/html/output/node/IHtmlOutputNode.class.php b/wcfsetup/install/files/lib/system/html/output/node/IHtmlOutputNode.class.php
index 2969fcebe8..d9fa14e632 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/IHtmlOutputNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/IHtmlOutputNode.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\output\node;
 use wcf\system\html\node\IHtmlNode;
 
diff --git a/wcfsetup/install/files/lib/system/html/simple/HtmlSimpleParser.class.php b/wcfsetup/install/files/lib/system/html/simple/HtmlSimpleParser.class.php
index b6834ac432..f770a2fe32 100644
--- a/wcfsetup/install/files/lib/system/html/simple/HtmlSimpleParser.class.php
+++ b/wcfsetup/install/files/lib/system/html/simple/HtmlSimpleParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\html\simple;
 use wcf\system\message\embedded\object\ISimpleMessageEmbeddedObjectHandler;
 use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
diff --git a/wcfsetup/install/files/lib/system/image/ImageHandler.class.php b/wcfsetup/install/files/lib/system/image/ImageHandler.class.php
index 70ef9c3864..50ba739745 100644
--- a/wcfsetup/install/files/lib/system/image/ImageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/image/ImageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\image;
 use wcf\system\exception\SystemException;
 use wcf\system\image\adapter\GDImageAdapter;
diff --git a/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php b/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php
index a768e0ce74..9477b692db 100644
--- a/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php
+++ b/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\image\adapter;
 use wcf\system\exception\SystemException;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/image/adapter/IImageAdapter.class.php b/wcfsetup/install/files/lib/system/image/adapter/IImageAdapter.class.php
index eadedb4504..9215d7871f 100644
--- a/wcfsetup/install/files/lib/system/image/adapter/IImageAdapter.class.php
+++ b/wcfsetup/install/files/lib/system/image/adapter/IImageAdapter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\image\adapter;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/image/adapter/ImageAdapter.class.php b/wcfsetup/install/files/lib/system/image/adapter/ImageAdapter.class.php
index ff930db86e..6e694849a0 100644
--- a/wcfsetup/install/files/lib/system/image/adapter/ImageAdapter.class.php
+++ b/wcfsetup/install/files/lib/system/image/adapter/ImageAdapter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\image\adapter;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php b/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php
index 5fe17aa3bb..72f194f6ee 100644
--- a/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php
+++ b/wcfsetup/install/files/lib/system/image/adapter/ImagickImageAdapter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\image\adapter;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractACLImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractACLImporter.class.php
index eba6d919fe..941b60b8cd 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractACLImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractACLImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php
index 896dc16949..5f2fecc758 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractAttachmentImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\attachment\Attachment;
 use wcf\data\attachment\AttachmentEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractCategoryImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractCategoryImporter.class.php
index 2e16460bb7..cfb9cbf0a5 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractCategoryImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractCategoryImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\category\Category;
 use wcf\data\category\CategoryEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractCommentImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractCommentImporter.class.php
index da7d092748..2d6a05a5d9 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractCommentImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractCommentImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractCommentResponseImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractCommentResponseImporter.class.php
index 6bb9c64204..8dc1bc3d0c 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractCommentResponseImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractCommentResponseImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractImporter.class.php
index 299f515ddc..824dd3d6c9 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\package\PackageCache;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractLikeImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractLikeImporter.class.php
index 5ba791e245..f1009a5c6b 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractLikeImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractLikeImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\like\Like;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractPollImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractPollImporter.class.php
index 596b319448..0eacd4fbdf 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractPollImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractPollImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\poll\Poll;
 use wcf\data\poll\PollEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractPollOptionImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractPollOptionImporter.class.php
index 7c38dbef1e..6f2df911bd 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractPollOptionImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractPollOptionImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\poll\option\PollOption;
 use wcf\data\poll\option\PollOptionEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractPollOptionVoteImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractPollOptionVoteImporter.class.php
index c8e4e4a164..323cf2a373 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractPollOptionVoteImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractPollOptionVoteImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/importer/AbstractWatchedObjectImporter.class.php b/wcfsetup/install/files/lib/system/importer/AbstractWatchedObjectImporter.class.php
index 33f2ba045f..faa785360f 100644
--- a/wcfsetup/install/files/lib/system/importer/AbstractWatchedObjectImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/AbstractWatchedObjectImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\object\watch\UserObjectWatch;
 use wcf\data\user\object\watch\UserObjectWatchEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/ArticleCategoryImporter.class.php b/wcfsetup/install/files/lib/system/importer/ArticleCategoryImporter.class.php
index f1bd45e3c7..c037c7068f 100644
--- a/wcfsetup/install/files/lib/system/importer/ArticleCategoryImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/ArticleCategoryImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\object\type\ObjectTypeCache;
 
diff --git a/wcfsetup/install/files/lib/system/importer/ArticleCommentImporter.class.php b/wcfsetup/install/files/lib/system/importer/ArticleCommentImporter.class.php
index 2b4bb4e02a..8cf703efcc 100644
--- a/wcfsetup/install/files/lib/system/importer/ArticleCommentImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/ArticleCommentImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\article\Article;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/importer/ArticleCommentResponseImporter.class.php b/wcfsetup/install/files/lib/system/importer/ArticleCommentResponseImporter.class.php
index 0f863e237c..36dcc9ab01 100644
--- a/wcfsetup/install/files/lib/system/importer/ArticleCommentResponseImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/ArticleCommentResponseImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/importer/ArticleImporter.class.php b/wcfsetup/install/files/lib/system/importer/ArticleImporter.class.php
index 8638969770..d817cdf584 100644
--- a/wcfsetup/install/files/lib/system/importer/ArticleImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/ArticleImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\article\content\ArticleContentEditor;
 use wcf\data\article\Article;
diff --git a/wcfsetup/install/files/lib/system/importer/IImporter.class.php b/wcfsetup/install/files/lib/system/importer/IImporter.class.php
index 56c848b0c6..7d187f10d8 100644
--- a/wcfsetup/install/files/lib/system/importer/IImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/IImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/importer/ImportHandler.class.php b/wcfsetup/install/files/lib/system/importer/ImportHandler.class.php
index c6b66b101c..668719a42f 100644
--- a/wcfsetup/install/files/lib/system/importer/ImportHandler.class.php
+++ b/wcfsetup/install/files/lib/system/importer/ImportHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\cache\CacheHandler;
diff --git a/wcfsetup/install/files/lib/system/importer/LabelGroupImporter.class.php b/wcfsetup/install/files/lib/system/importer/LabelGroupImporter.class.php
index 9991e3a729..42c4a55e65 100644
--- a/wcfsetup/install/files/lib/system/importer/LabelGroupImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/LabelGroupImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\label\group\LabelGroup;
 use wcf\data\label\group\LabelGroupEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/LabelImporter.class.php b/wcfsetup/install/files/lib/system/importer/LabelImporter.class.php
index 7da90aef72..691e2e984e 100644
--- a/wcfsetup/install/files/lib/system/importer/LabelImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/LabelImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\label\Label;
 use wcf\data\label\LabelEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/MediaImporter.class.php b/wcfsetup/install/files/lib/system/importer/MediaImporter.class.php
index d7c82ec97a..f3d7a74d3c 100644
--- a/wcfsetup/install/files/lib/system/importer/MediaImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/MediaImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\media\Media;
 use wcf\data\media\MediaAction;
diff --git a/wcfsetup/install/files/lib/system/importer/SmileyCategoryImporter.class.php b/wcfsetup/install/files/lib/system/importer/SmileyCategoryImporter.class.php
index b35605377d..d564298e46 100644
--- a/wcfsetup/install/files/lib/system/importer/SmileyCategoryImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/SmileyCategoryImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\object\type\ObjectTypeCache;
 
diff --git a/wcfsetup/install/files/lib/system/importer/SmileyImporter.class.php b/wcfsetup/install/files/lib/system/importer/SmileyImporter.class.php
index 5f904fc87e..2209c58eb1 100644
--- a/wcfsetup/install/files/lib/system/importer/SmileyImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/SmileyImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\smiley\Smiley;
 use wcf\data\smiley\SmileyEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/TrophyCategoryImporter.class.php b/wcfsetup/install/files/lib/system/importer/TrophyCategoryImporter.class.php
index 974c13fed6..359723e33a 100644
--- a/wcfsetup/install/files/lib/system/importer/TrophyCategoryImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/TrophyCategoryImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\object\type\ObjectTypeCache;
 
diff --git a/wcfsetup/install/files/lib/system/importer/TrophyImporter.class.php b/wcfsetup/install/files/lib/system/importer/TrophyImporter.class.php
index 5ecbba9e8e..625fd9185e 100644
--- a/wcfsetup/install/files/lib/system/importer/TrophyImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/TrophyImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\trophy\Trophy;
diff --git a/wcfsetup/install/files/lib/system/importer/UserAvatarImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserAvatarImporter.class.php
index f72dc42730..8138157f1e 100644
--- a/wcfsetup/install/files/lib/system/importer/UserAvatarImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserAvatarImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\avatar\UserAvatar;
 use wcf\data\user\avatar\UserAvatarEditor;
diff --git a/wcfsetup/install/files/lib/system/importer/UserCommentImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserCommentImporter.class.php
index d99d47fcc4..88b445727a 100644
--- a/wcfsetup/install/files/lib/system/importer/UserCommentImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserCommentImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\object\type\ObjectTypeCache;
 
diff --git a/wcfsetup/install/files/lib/system/importer/UserCommentResponseImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserCommentResponseImporter.class.php
index c2b30ae680..6b008ccff0 100644
--- a/wcfsetup/install/files/lib/system/importer/UserCommentResponseImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserCommentResponseImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/importer/UserFollowerImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserFollowerImporter.class.php
index 8a8afb2c88..34282a1ce2 100644
--- a/wcfsetup/install/files/lib/system/importer/UserFollowerImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserFollowerImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\follow\UserFollow;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/importer/UserGroupImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserGroupImporter.class.php
index 58decfdb79..d4bbce48eb 100644
--- a/wcfsetup/install/files/lib/system/importer/UserGroupImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserGroupImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\group\UserGroupAction;
diff --git a/wcfsetup/install/files/lib/system/importer/UserImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserImporter.class.php
index 1bbcd77645..942151b138 100644
--- a/wcfsetup/install/files/lib/system/importer/UserImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\option\UserOption;
diff --git a/wcfsetup/install/files/lib/system/importer/UserOptionImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserOptionImporter.class.php
index ffd3566b0c..9f890065d8 100644
--- a/wcfsetup/install/files/lib/system/importer/UserOptionImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserOptionImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\option\category\UserOptionCategoryEditor;
 use wcf\data\user\option\category\UserOptionCategoryList;
diff --git a/wcfsetup/install/files/lib/system/importer/UserRankImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserRankImporter.class.php
index 4ade3d3a3d..681522a8ae 100644
--- a/wcfsetup/install/files/lib/system/importer/UserRankImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserRankImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\rank\UserRank;
diff --git a/wcfsetup/install/files/lib/system/importer/UserTrophyImporter.class.php b/wcfsetup/install/files/lib/system/importer/UserTrophyImporter.class.php
index ca9cf7a272..5446fd253d 100644
--- a/wcfsetup/install/files/lib/system/importer/UserTrophyImporter.class.php
+++ b/wcfsetup/install/files/lib/system/importer/UserTrophyImporter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\importer;
 use wcf\data\user\trophy\UserTrophy;
 use wcf\data\user\trophy\UserTrophyEditor;
diff --git a/wcfsetup/install/files/lib/system/io/AtomicWriter.class.php b/wcfsetup/install/files/lib/system/io/AtomicWriter.class.php
index 10be87eae7..e85d6685c7 100644
--- a/wcfsetup/install/files/lib/system/io/AtomicWriter.class.php
+++ b/wcfsetup/install/files/lib/system/io/AtomicWriter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/io/FTP.class.php b/wcfsetup/install/files/lib/system/io/FTP.class.php
index 6b7cc57e20..8ffc88c56d 100644
--- a/wcfsetup/install/files/lib/system/io/FTP.class.php
+++ b/wcfsetup/install/files/lib/system/io/FTP.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/io/File.class.php b/wcfsetup/install/files/lib/system/io/File.class.php
index ca4f859224..b806fec758 100644
--- a/wcfsetup/install/files/lib/system/io/File.class.php
+++ b/wcfsetup/install/files/lib/system/io/File.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/io/GZipFile.class.php b/wcfsetup/install/files/lib/system/io/GZipFile.class.php
index 56f0e7a8c4..2c463fd746 100644
--- a/wcfsetup/install/files/lib/system/io/GZipFile.class.php
+++ b/wcfsetup/install/files/lib/system/io/GZipFile.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/io/IArchive.class.php b/wcfsetup/install/files/lib/system/io/IArchive.class.php
index 04cf3c7a9b..353a845b66 100644
--- a/wcfsetup/install/files/lib/system/io/IArchive.class.php
+++ b/wcfsetup/install/files/lib/system/io/IArchive.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/io/RemoteFile.class.php b/wcfsetup/install/files/lib/system/io/RemoteFile.class.php
index 38343ec3a7..ad79ebc0fa 100644
--- a/wcfsetup/install/files/lib/system/io/RemoteFile.class.php
+++ b/wcfsetup/install/files/lib/system/io/RemoteFile.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/system/io/Tar.class.php b/wcfsetup/install/files/lib/system/io/Tar.class.php
index 2258cd0c4c..795e287834 100644
--- a/wcfsetup/install/files/lib/system/io/Tar.class.php
+++ b/wcfsetup/install/files/lib/system/io/Tar.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/io/TarWriter.class.php b/wcfsetup/install/files/lib/system/io/TarWriter.class.php
index ead6cf6330..4ca7801af2 100644
--- a/wcfsetup/install/files/lib/system/io/TarWriter.class.php
+++ b/wcfsetup/install/files/lib/system/io/TarWriter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/io/Zip.class.php b/wcfsetup/install/files/lib/system/io/Zip.class.php
index e6f29387e2..3b29136b3b 100644
--- a/wcfsetup/install/files/lib/system/io/Zip.class.php
+++ b/wcfsetup/install/files/lib/system/io/Zip.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\system\exception\SystemException;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/io/ZipWriter.class.php b/wcfsetup/install/files/lib/system/io/ZipWriter.class.php
index a72d11e9b3..60e40c7893 100644
--- a/wcfsetup/install/files/lib/system/io/ZipWriter.class.php
+++ b/wcfsetup/install/files/lib/system/io/ZipWriter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\io;
 use wcf\util\FileUtil;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/label/LabelHandler.class.php b/wcfsetup/install/files/lib/system/label/LabelHandler.class.php
index faf8450149..f55e90fb70 100644
--- a/wcfsetup/install/files/lib/system/label/LabelHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/LabelHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label;
 use wcf\data\label\group\LabelGroup;
 use wcf\data\label\group\ViewableLabelGroup;
diff --git a/wcfsetup/install/files/lib/system/label/object/AbstractLabelObjectHandler.class.php b/wcfsetup/install/files/lib/system/label/object/AbstractLabelObjectHandler.class.php
index 15e9357508..39c8b1e965 100644
--- a/wcfsetup/install/files/lib/system/label/object/AbstractLabelObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/AbstractLabelObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object;
 use wcf\data\label\group\LabelGroup;
 use wcf\data\label\group\ViewableLabelGroup;
diff --git a/wcfsetup/install/files/lib/system/label/object/ArticleLabelObjectHandler.class.php b/wcfsetup/install/files/lib/system/label/object/ArticleLabelObjectHandler.class.php
index d0398aef24..a0b34d9e0d 100644
--- a/wcfsetup/install/files/lib/system/label/object/ArticleLabelObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/ArticleLabelObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object;
 use wcf\system\cache\builder\ArticleCategoryLabelCacheBuilder;
 use wcf\system\label\LabelHandler;
diff --git a/wcfsetup/install/files/lib/system/label/object/ILabelObjectHandler.class.php b/wcfsetup/install/files/lib/system/label/object/ILabelObjectHandler.class.php
index 36d20ab234..48b9c19520 100644
--- a/wcfsetup/install/files/lib/system/label/object/ILabelObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/ILabelObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object;
 use wcf\data\label\group\ViewableLabelGroup;
 use wcf\data\label\Label;
diff --git a/wcfsetup/install/files/lib/system/label/object/type/AbstractLabelObjectTypeHandler.class.php b/wcfsetup/install/files/lib/system/label/object/type/AbstractLabelObjectTypeHandler.class.php
index 15692f3b4d..a71a2157ab 100644
--- a/wcfsetup/install/files/lib/system/label/object/type/AbstractLabelObjectTypeHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/type/AbstractLabelObjectTypeHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object\type;
 use wcf\system\SingletonFactory;
 
diff --git a/wcfsetup/install/files/lib/system/label/object/type/ArticleCategoryLabelObjectTypeHandler.class.php b/wcfsetup/install/files/lib/system/label/object/type/ArticleCategoryLabelObjectTypeHandler.class.php
index 5687b73854..e98b980811 100644
--- a/wcfsetup/install/files/lib/system/label/object/type/ArticleCategoryLabelObjectTypeHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/type/ArticleCategoryLabelObjectTypeHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object\type;
 use wcf\data\article\category\ArticleCategoryNode;
 use wcf\data\article\category\ArticleCategoryNodeTree;
diff --git a/wcfsetup/install/files/lib/system/label/object/type/ILabelObjectTypeHandler.class.php b/wcfsetup/install/files/lib/system/label/object/type/ILabelObjectTypeHandler.class.php
index dd3a09b50a..59517c99f1 100644
--- a/wcfsetup/install/files/lib/system/label/object/type/ILabelObjectTypeHandler.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/type/ILabelObjectTypeHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object\type;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/label/object/type/LabelObjectType.class.php b/wcfsetup/install/files/lib/system/label/object/type/LabelObjectType.class.php
index c3fd796aa8..e43f4d1392 100644
--- a/wcfsetup/install/files/lib/system/label/object/type/LabelObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/type/LabelObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object\type;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/label/object/type/LabelObjectTypeContainer.class.php b/wcfsetup/install/files/lib/system/label/object/type/LabelObjectTypeContainer.class.php
index 321b9699c6..a72bd2addd 100644
--- a/wcfsetup/install/files/lib/system/label/object/type/LabelObjectTypeContainer.class.php
+++ b/wcfsetup/install/files/lib/system/label/object/type/LabelObjectTypeContainer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\label\object\type;
 use wcf\data\object\type\ObjectTypeCache;
 
diff --git a/wcfsetup/install/files/lib/system/language/I18nHandler.class.php b/wcfsetup/install/files/lib/system/language/I18nHandler.class.php
index bca0da754a..be2e60a251 100644
--- a/wcfsetup/install/files/lib/system/language/I18nHandler.class.php
+++ b/wcfsetup/install/files/lib/system/language/I18nHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\language;
 use wcf\data\language\Language;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/language/I18nValue.class.php b/wcfsetup/install/files/lib/system/language/I18nValue.class.php
index 59f5e0be92..0fd7581c44 100644
--- a/wcfsetup/install/files/lib/system/language/I18nValue.class.php
+++ b/wcfsetup/install/files/lib/system/language/I18nValue.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\language;
 use wcf\data\package\PackageCache;
 
diff --git a/wcfsetup/install/files/lib/system/language/LanguageFactory.class.php b/wcfsetup/install/files/lib/system/language/LanguageFactory.class.php
index 8500e10428..cf4493f687 100644
--- a/wcfsetup/install/files/lib/system/language/LanguageFactory.class.php
+++ b/wcfsetup/install/files/lib/system/language/LanguageFactory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\language;
 use wcf\data\language\category\LanguageCategory;
 use wcf\data\language\Language;
diff --git a/wcfsetup/install/files/lib/system/like/IViewableLikeProvider.class.php b/wcfsetup/install/files/lib/system/like/IViewableLikeProvider.class.php
index d3b7bd80fb..ae669cfec2 100644
--- a/wcfsetup/install/files/lib/system/like/IViewableLikeProvider.class.php
+++ b/wcfsetup/install/files/lib/system/like/IViewableLikeProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\like;
 use wcf\data\like\ViewableLike;
 
diff --git a/wcfsetup/install/files/lib/system/like/LikeHandler.class.php b/wcfsetup/install/files/lib/system/like/LikeHandler.class.php
index 027da64336..b25f9a71c1 100644
--- a/wcfsetup/install/files/lib/system/like/LikeHandler.class.php
+++ b/wcfsetup/install/files/lib/system/like/LikeHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\like;
 use wcf\data\like\object\ILikeObject;
 use wcf\data\like\object\LikeObject;
diff --git a/wcfsetup/install/files/lib/system/log/modification/AbstractModificationLogHandler.class.php b/wcfsetup/install/files/lib/system/log/modification/AbstractModificationLogHandler.class.php
index c878c4e34f..0740740e48 100644
--- a/wcfsetup/install/files/lib/system/log/modification/AbstractModificationLogHandler.class.php
+++ b/wcfsetup/install/files/lib/system/log/modification/AbstractModificationLogHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\log\modification;
 use wcf\data\modification\log\ModificationLog;
 use wcf\data\modification\log\ModificationLogAction;
diff --git a/wcfsetup/install/files/lib/system/log/modification/ModificationLogHandler.class.php b/wcfsetup/install/files/lib/system/log/modification/ModificationLogHandler.class.php
index 97bf520111..0a726fafd6 100644
--- a/wcfsetup/install/files/lib/system/log/modification/ModificationLogHandler.class.php
+++ b/wcfsetup/install/files/lib/system/log/modification/ModificationLogHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\log\modification;
 use wcf\data\modification\log\ModificationLog;
 use wcf\data\modification\log\ModificationLogAction;
diff --git a/wcfsetup/install/files/lib/system/mail/DebugMailSender.class.php b/wcfsetup/install/files/lib/system/mail/DebugMailSender.class.php
index 31a44f5f09..d671788c58 100644
--- a/wcfsetup/install/files/lib/system/mail/DebugMailSender.class.php
+++ b/wcfsetup/install/files/lib/system/mail/DebugMailSender.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\mail;
 use wcf\system\io\File;
 
diff --git a/wcfsetup/install/files/lib/system/mail/Mail.class.php b/wcfsetup/install/files/lib/system/mail/Mail.class.php
index e124e504b8..bd87b854b3 100644
--- a/wcfsetup/install/files/lib/system/mail/Mail.class.php
+++ b/wcfsetup/install/files/lib/system/mail/Mail.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\mail;
 use wcf\data\language\Language;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/mail/MailSender.class.php b/wcfsetup/install/files/lib/system/mail/MailSender.class.php
index 7ae8585372..e414493f55 100644
--- a/wcfsetup/install/files/lib/system/mail/MailSender.class.php
+++ b/wcfsetup/install/files/lib/system/mail/MailSender.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\mail;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/mail/PHPMailSender.class.php b/wcfsetup/install/files/lib/system/mail/PHPMailSender.class.php
index 1ca1c9e3a1..d4fae58eba 100644
--- a/wcfsetup/install/files/lib/system/mail/PHPMailSender.class.php
+++ b/wcfsetup/install/files/lib/system/mail/PHPMailSender.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\mail;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/mail/SMTPMailSender.class.php b/wcfsetup/install/files/lib/system/mail/SMTPMailSender.class.php
index ef65da4594..4341638695 100644
--- a/wcfsetup/install/files/lib/system/mail/SMTPMailSender.class.php
+++ b/wcfsetup/install/files/lib/system/mail/SMTPMailSender.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\mail;
 use wcf\system\exception\SystemException;
 use wcf\system\io\RemoteFile;
diff --git a/wcfsetup/install/files/lib/system/menu/ITreeMenuItem.class.php b/wcfsetup/install/files/lib/system/menu/ITreeMenuItem.class.php
index e4628ba0b9..2b1e8a6237 100644
--- a/wcfsetup/install/files/lib/system/menu/ITreeMenuItem.class.php
+++ b/wcfsetup/install/files/lib/system/menu/ITreeMenuItem.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/menu/TreeMenu.class.php b/wcfsetup/install/files/lib/system/menu/TreeMenu.class.php
index 130d26b033..3dddc764b2 100644
--- a/wcfsetup/install/files/lib/system/menu/TreeMenu.class.php
+++ b/wcfsetup/install/files/lib/system/menu/TreeMenu.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu;
 use wcf\system\event\EventHandler;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/menu/acp/ACPMenu.class.php b/wcfsetup/install/files/lib/system/menu/acp/ACPMenu.class.php
index eaf6d1bd5e..2bef6e9d78 100644
--- a/wcfsetup/install/files/lib/system/menu/acp/ACPMenu.class.php
+++ b/wcfsetup/install/files/lib/system/menu/acp/ACPMenu.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\acp;
 use wcf\system\cache\builder\ACPMenuCacheBuilder;
 use wcf\system\menu\TreeMenu;
diff --git a/wcfsetup/install/files/lib/system/menu/user/DefaultUserMenuItemProvider.class.php b/wcfsetup/install/files/lib/system/menu/user/DefaultUserMenuItemProvider.class.php
index 8dc55f81e4..630867d02a 100644
--- a/wcfsetup/install/files/lib/system/menu/user/DefaultUserMenuItemProvider.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/DefaultUserMenuItemProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user;
 use wcf\data\user\menu\item\UserMenuItem;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/menu/user/IUserMenuItemProvider.class.php b/wcfsetup/install/files/lib/system/menu/user/IUserMenuItemProvider.class.php
index 7c0688e3ca..09a441dbb6 100644
--- a/wcfsetup/install/files/lib/system/menu/user/IUserMenuItemProvider.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/IUserMenuItemProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user;
 use wcf\data\IDatabaseObjectProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/menu/user/UserMenu.class.php b/wcfsetup/install/files/lib/system/menu/user/UserMenu.class.php
index 432c8fb1a5..dde814bc15 100644
--- a/wcfsetup/install/files/lib/system/menu/user/UserMenu.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/UserMenu.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user;
 use wcf\data\user\menu\item\UserMenuItem;
 use wcf\system\cache\builder\UserMenuCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/menu/user/profile/UserProfileMenu.class.php b/wcfsetup/install/files/lib/system/menu/user/profile/UserProfileMenu.class.php
index 3732992d33..27a47429bb 100644
--- a/wcfsetup/install/files/lib/system/menu/user/profile/UserProfileMenu.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/profile/UserProfileMenu.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user\profile;
 use wcf\data\user\profile\menu\item\UserProfileMenuItem;
 use wcf\system\cache\builder\UserProfileMenuCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/menu/user/profile/content/AboutUserProfileMenuContent.class.php b/wcfsetup/install/files/lib/system/menu/user/profile/content/AboutUserProfileMenuContent.class.php
index b760923f4d..656a88e245 100644
--- a/wcfsetup/install/files/lib/system/menu/user/profile/content/AboutUserProfileMenuContent.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/profile/content/AboutUserProfileMenuContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user\profile\content;
 use wcf\data\user\User;
 use wcf\system\option\user\UserOptionHandler;
diff --git a/wcfsetup/install/files/lib/system/menu/user/profile/content/CommentUserProfileMenuContent.class.php b/wcfsetup/install/files/lib/system/menu/user/profile/content/CommentUserProfileMenuContent.class.php
index 3dfbdc7a11..9485e6a0c8 100644
--- a/wcfsetup/install/files/lib/system/menu/user/profile/content/CommentUserProfileMenuContent.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/profile/content/CommentUserProfileMenuContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user\profile\content;
 use wcf\system\comment\CommentHandler;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/menu/user/profile/content/IUserProfileMenuContent.class.php b/wcfsetup/install/files/lib/system/menu/user/profile/content/IUserProfileMenuContent.class.php
index 22a3164fc0..b4813c5eeb 100644
--- a/wcfsetup/install/files/lib/system/menu/user/profile/content/IUserProfileMenuContent.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/profile/content/IUserProfileMenuContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user\profile\content;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/menu/user/profile/content/LikesUserProfileMenuContent.class.php b/wcfsetup/install/files/lib/system/menu/user/profile/content/LikesUserProfileMenuContent.class.php
index 0b812932ff..671a432cbe 100644
--- a/wcfsetup/install/files/lib/system/menu/user/profile/content/LikesUserProfileMenuContent.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/profile/content/LikesUserProfileMenuContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user\profile\content;
 use wcf\data\like\Like;
 use wcf\data\like\ViewableLikeList;
diff --git a/wcfsetup/install/files/lib/system/menu/user/profile/content/RecentActivityUserProfileMenuContent.class.php b/wcfsetup/install/files/lib/system/menu/user/profile/content/RecentActivityUserProfileMenuContent.class.php
index 39cd0bf69f..3d2ff2584d 100644
--- a/wcfsetup/install/files/lib/system/menu/user/profile/content/RecentActivityUserProfileMenuContent.class.php
+++ b/wcfsetup/install/files/lib/system/menu/user/profile/content/RecentActivityUserProfileMenuContent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\menu\user\profile\content;
 use wcf\data\user\activity\event\ViewableUserActivityEventList;
 use wcf\system\user\activity\event\UserActivityEventHandler;
diff --git a/wcfsetup/install/files/lib/system/message/QuickReplyManager.class.php b/wcfsetup/install/files/lib/system/message/QuickReplyManager.class.php
index eae1c86258..904f7aef27 100644
--- a/wcfsetup/install/files/lib/system/message/QuickReplyManager.class.php
+++ b/wcfsetup/install/files/lib/system/message/QuickReplyManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message;
 use wcf\data\DatabaseObjectDecorator;
 use wcf\data\IAttachmentMessageQuickReplyAction;
diff --git a/wcfsetup/install/files/lib/system/message/censorship/Censorship.class.php b/wcfsetup/install/files/lib/system/message/censorship/Censorship.class.php
index 68deaa2bfa..d13a567191 100644
--- a/wcfsetup/install/files/lib/system/message/censorship/Censorship.class.php
+++ b/wcfsetup/install/files/lib/system/message/censorship/Censorship.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\censorship;
 use wcf\system\SingletonFactory;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/AbstractMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/AbstractMessageEmbeddedObjectHandler.class.php
index 5b1bf6c5af..07aeab8ecb 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/AbstractMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/AbstractMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\object\type\ObjectType;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/AbstractSimpleMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/AbstractSimpleMessageEmbeddedObjectHandler.class.php
index 013e42e9d8..a5a1c30c37 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/AbstractSimpleMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/AbstractSimpleMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\system\html\input\HtmlInputProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/AttachmentMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/AttachmentMessageEmbeddedObjectHandler.class.php
index 971a2c5b75..dd73badd85 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/AttachmentMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/AttachmentMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\attachment\AttachmentList;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/IMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/IMessageEmbeddedObjectHandler.class.php
index 1a62029272..06ba8f3a5f 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/IMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/IMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\DatabaseObject;
 use wcf\system\html\input\HtmlInputProcessor;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/ISimpleMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/ISimpleMessageEmbeddedObjectHandler.class.php
index cff6d6489e..b03b1ff627 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/ISimpleMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/ISimpleMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/MediaMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/MediaMessageEmbeddedObjectHandler.class.php
index ee591d94dd..6d6fde0847 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/MediaMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/MediaMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\media\Media;
 use wcf\data\media\MediaList;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/MessageEmbeddedObjectManager.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/MessageEmbeddedObjectManager.class.php
index f1112cedda..c6654fcd02 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/MessageEmbeddedObjectManager.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/MessageEmbeddedObjectManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/PageMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/PageMessageEmbeddedObjectHandler.class.php
index 8901e6c5d6..e6f11f1471 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/PageMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/PageMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\page\Page;
 use wcf\data\page\PageCache;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/QuoteMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/QuoteMessageEmbeddedObjectHandler.class.php
index fe67f05c81..7facb340ac 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/QuoteMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/QuoteMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\data\user\UserList;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/message/embedded/object/UserMessageEmbeddedObjectHandler.class.php b/wcfsetup/install/files/lib/system/message/embedded/object/UserMessageEmbeddedObjectHandler.class.php
index 4a10d77842..0e1c3fe657 100644
--- a/wcfsetup/install/files/lib/system/message/embedded/object/UserMessageEmbeddedObjectHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/embedded/object/UserMessageEmbeddedObjectHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\embedded\object;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 use wcf\system\html\input\HtmlInputProcessor;
diff --git a/wcfsetup/install/files/lib/system/message/quote/AbstractMessageQuoteHandler.class.php b/wcfsetup/install/files/lib/system/message/quote/AbstractMessageQuoteHandler.class.php
index 8d8e550a75..035cfbedd9 100644
--- a/wcfsetup/install/files/lib/system/message/quote/AbstractMessageQuoteHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/quote/AbstractMessageQuoteHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\quote;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/message/quote/IMessageQuoteHandler.class.php b/wcfsetup/install/files/lib/system/message/quote/IMessageQuoteHandler.class.php
index ce736502fc..616bc0b5b1 100644
--- a/wcfsetup/install/files/lib/system/message/quote/IMessageQuoteHandler.class.php
+++ b/wcfsetup/install/files/lib/system/message/quote/IMessageQuoteHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\quote;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/message/quote/MessageQuoteManager.class.php b/wcfsetup/install/files/lib/system/message/quote/MessageQuoteManager.class.php
index 4fa545a442..4a0411d47e 100644
--- a/wcfsetup/install/files/lib/system/message/quote/MessageQuoteManager.class.php
+++ b/wcfsetup/install/files/lib/system/message/quote/MessageQuoteManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\quote;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/message/quote/QuotedMessage.class.php b/wcfsetup/install/files/lib/system/message/quote/QuotedMessage.class.php
index d0286a4a9b..be0db6a564 100644
--- a/wcfsetup/install/files/lib/system/message/quote/QuotedMessage.class.php
+++ b/wcfsetup/install/files/lib/system/message/quote/QuotedMessage.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\message\quote;
 use wcf\data\IMessage;
 
diff --git a/wcfsetup/install/files/lib/system/moderation/AbstractDeletedContentProvider.class.php b/wcfsetup/install/files/lib/system/moderation/AbstractDeletedContentProvider.class.php
index bf80dfcc6a..6b32c8758e 100644
--- a/wcfsetup/install/files/lib/system/moderation/AbstractDeletedContentProvider.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/AbstractDeletedContentProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/moderation/IDeletedContentProvider.class.php b/wcfsetup/install/files/lib/system/moderation/IDeletedContentProvider.class.php
index 45aa3a0495..a4904882d9 100644
--- a/wcfsetup/install/files/lib/system/moderation/IDeletedContentProvider.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/IDeletedContentProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentCommentModerationQueueHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentCommentModerationQueueHandler.class.php
index 3493dfbe42..ae4e145899 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentCommentModerationQueueHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentCommentModerationQueueHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentAction;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentResponseModerationQueueHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentResponseModerationQueueHandler.class.php
index 2f3aa315a1..213acdfabf 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentResponseModerationQueueHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/AbstractCommentResponseModerationQueueHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseAction;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueHandler.class.php
index 07880763e8..6a5c4b264a 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ModerationQueueAction;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueManager.class.php b/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueManager.class.php
index 09d81ee7d5..db34b59f0b 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueManager.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/AbstractModerationQueueManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ModerationQueueAction;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueHandler.class.php
index a9415ec1cc..6e84a041f0 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ViewableModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueManager.class.php b/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueManager.class.php
index c1c0ba8b1b..726a63ae6e 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueManager.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/IModerationQueueManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ViewableModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueActivationManager.class.php b/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueActivationManager.class.php
index 5d93ff3614..ce8928e938 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueActivationManager.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueActivationManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ViewableModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueManager.class.php b/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueManager.class.php
index 2dc3f0dbc5..650ed0b8fa 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueManager.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ModerationQueueList;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueReportManager.class.php b/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueReportManager.class.php
index a2992c606d..0928bb912f 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueReportManager.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/ModerationQueueReportManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ModerationQueueAction;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentCommentModerationQueueActivationHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentCommentModerationQueueActivationHandler.class.php
index e9238cb115..b05ce8bfcf 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentCommentModerationQueueActivationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentCommentModerationQueueActivationHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\activation;
 use wcf\data\comment\CommentAction;
 use wcf\data\moderation\queue\ModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentResponseModerationQueueActivationHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentResponseModerationQueueActivationHandler.class.php
index 6997e13de0..80732edc40 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentResponseModerationQueueActivationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/activation/CommentResponseModerationQueueActivationHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\activation;
 use wcf\data\comment\CommentAction;
 use wcf\data\moderation\queue\ModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/activation/IModerationQueueActivationHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/activation/IModerationQueueActivationHandler.class.php
index 1342d3f21b..29da2674e9 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/activation/IModerationQueueActivationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/activation/IModerationQueueActivationHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\activation;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ViewableModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/report/CommentCommentModerationQueueReportHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/report/CommentCommentModerationQueueReportHandler.class.php
index 0cb42edf33..7405222af4 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/report/CommentCommentModerationQueueReportHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/report/CommentCommentModerationQueueReportHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\report;
 use wcf\data\moderation\queue\ViewableModerationQueue;
 use wcf\system\moderation\queue\AbstractCommentCommentModerationQueueHandler;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/report/CommentResponseModerationQueueReportHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/report/CommentResponseModerationQueueReportHandler.class.php
index c3ac88b4d2..1b5834b697 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/report/CommentResponseModerationQueueReportHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/report/CommentResponseModerationQueueReportHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\report;
 use wcf\data\moderation\queue\ViewableModerationQueue;
 use wcf\system\moderation\queue\AbstractCommentResponseModerationQueueHandler;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/report/IModerationQueueReportHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/report/IModerationQueueReportHandler.class.php
index 075516ff65..5bd32dc8dd 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/report/IModerationQueueReportHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/report/IModerationQueueReportHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\report;
 use wcf\data\moderation\queue\ViewableModerationQueue;
 use wcf\system\moderation\queue\IModerationQueueHandler;
diff --git a/wcfsetup/install/files/lib/system/moderation/queue/report/UserModerationQueueReportHandler.class.php b/wcfsetup/install/files/lib/system/moderation/queue/report/UserModerationQueueReportHandler.class.php
index 39cca93d51..8388431584 100644
--- a/wcfsetup/install/files/lib/system/moderation/queue/report/UserModerationQueueReportHandler.class.php
+++ b/wcfsetup/install/files/lib/system/moderation/queue/report/UserModerationQueueReportHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\moderation\queue\report;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\moderation\queue\ViewableModerationQueue;
diff --git a/wcfsetup/install/files/lib/system/notice/NoticeHandler.class.php b/wcfsetup/install/files/lib/system/notice/NoticeHandler.class.php
index 782663495a..c2beea9a98 100644
--- a/wcfsetup/install/files/lib/system/notice/NoticeHandler.class.php
+++ b/wcfsetup/install/files/lib/system/notice/NoticeHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\notice;
 use wcf\data\notice\Notice;
 use wcf\system\cache\builder\NoticeCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/option/AboutMeOptionType.class.php b/wcfsetup/install/files/lib/system/option/AboutMeOptionType.class.php
index b0e53e4277..064177deae 100644
--- a/wcfsetup/install/files/lib/system/option/AboutMeOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/AboutMeOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/AbstractCategoryMultiSelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/AbstractCategoryMultiSelectOptionType.class.php
index 7cdb224281..0c11109c01 100644
--- a/wcfsetup/install/files/lib/system/option/AbstractCategoryMultiSelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/AbstractCategoryMultiSelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\category\CategoryNodeTree;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/option/AbstractOptionType.class.php b/wcfsetup/install/files/lib/system/option/AbstractOptionType.class.php
index 7cd3773beb..4013a260f7 100644
--- a/wcfsetup/install/files/lib/system/option/AbstractOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/AbstractOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 
diff --git a/wcfsetup/install/files/lib/system/option/ArticleCategoryMultiSelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/ArticleCategoryMultiSelectOptionType.class.php
index fd711d2e96..9a5088980e 100644
--- a/wcfsetup/install/files/lib/system/option/ArticleCategoryMultiSelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/ArticleCategoryMultiSelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\article\category\ArticleCategoryNodeTree;
 
diff --git a/wcfsetup/install/files/lib/system/option/BirthdayOptionType.class.php b/wcfsetup/install/files/lib/system/option/BirthdayOptionType.class.php
index d8fbac08af..a9dac9d5fa 100644
--- a/wcfsetup/install/files/lib/system/option/BirthdayOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/BirthdayOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/BooleanOptionType.class.php b/wcfsetup/install/files/lib/system/option/BooleanOptionType.class.php
index 55cdf1cd99..7eaaa9f088 100644
--- a/wcfsetup/install/files/lib/system/option/BooleanOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/BooleanOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/CaptchaSelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/CaptchaSelectOptionType.class.php
index 264b39551e..dab654c3ba 100644
--- a/wcfsetup/install/files/lib/system/option/CaptchaSelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/CaptchaSelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\captcha\CaptchaHandler;
diff --git a/wcfsetup/install/files/lib/system/option/CheckboxesOptionType.class.php b/wcfsetup/install/files/lib/system/option/CheckboxesOptionType.class.php
index c879a8d774..4d8df6d6a4 100644
--- a/wcfsetup/install/files/lib/system/option/CheckboxesOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/CheckboxesOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/option/ContactOptionHandler.class.php b/wcfsetup/install/files/lib/system/option/ContactOptionHandler.class.php
index ac77347a91..4c065f1683 100644
--- a/wcfsetup/install/files/lib/system/option/ContactOptionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/option/ContactOptionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\system\cache\builder\ContactOptionCacheBuilder;
 
diff --git a/wcfsetup/install/files/lib/system/option/CustomOptionHandler.class.php b/wcfsetup/install/files/lib/system/option/CustomOptionHandler.class.php
index 4777e20737..6820a8c0de 100644
--- a/wcfsetup/install/files/lib/system/option/CustomOptionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/option/CustomOptionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\custom\option\CustomOption;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/option/DateOptionType.class.php b/wcfsetup/install/files/lib/system/option/DateOptionType.class.php
index aa489422ff..a9c53e1c98 100644
--- a/wcfsetup/install/files/lib/system/option/DateOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/DateOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/DesktopNotificationApplicationSelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/DesktopNotificationApplicationSelectOptionType.class.php
index 305f119d9b..aaeb99410d 100644
--- a/wcfsetup/install/files/lib/system/option/DesktopNotificationApplicationSelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/DesktopNotificationApplicationSelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\application\ApplicationHandler;
diff --git a/wcfsetup/install/files/lib/system/option/FileOptionType.class.php b/wcfsetup/install/files/lib/system/option/FileOptionType.class.php
index 68306d9f25..2399893b1c 100644
--- a/wcfsetup/install/files/lib/system/option/FileOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/FileOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\package\PackageCache;
diff --git a/wcfsetup/install/files/lib/system/option/FileSizeOptionType.class.php b/wcfsetup/install/files/lib/system/option/FileSizeOptionType.class.php
index f5371c6671..b2f5a71bd9 100644
--- a/wcfsetup/install/files/lib/system/option/FileSizeOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/FileSizeOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/option/FloatOptionType.class.php b/wcfsetup/install/files/lib/system/option/FloatOptionType.class.php
index 51490a42fc..e14505f0a3 100644
--- a/wcfsetup/install/files/lib/system/option/FloatOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/FloatOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/option/IOptionHandler.class.php b/wcfsetup/install/files/lib/system/option/IOptionHandler.class.php
index e5e74e47c2..eb7be598ec 100644
--- a/wcfsetup/install/files/lib/system/option/IOptionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/option/IOptionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/option/IOptionType.class.php b/wcfsetup/install/files/lib/system/option/IOptionType.class.php
index 09e3747ae6..24cfca4fda 100644
--- a/wcfsetup/install/files/lib/system/option/IOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/IOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 
diff --git a/wcfsetup/install/files/lib/system/option/ISearchableConditionUserOption.class.php b/wcfsetup/install/files/lib/system/option/ISearchableConditionUserOption.class.php
index 2710f25d40..eee0f8822d 100644
--- a/wcfsetup/install/files/lib/system/option/ISearchableConditionUserOption.class.php
+++ b/wcfsetup/install/files/lib/system/option/ISearchableConditionUserOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/ISearchableUserOption.class.php b/wcfsetup/install/files/lib/system/option/ISearchableUserOption.class.php
index b34c1f2a3f..e4ced651aa 100644
--- a/wcfsetup/install/files/lib/system/option/ISearchableUserOption.class.php
+++ b/wcfsetup/install/files/lib/system/option/ISearchableUserOption.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/option/IntegerOptionType.class.php b/wcfsetup/install/files/lib/system/option/IntegerOptionType.class.php
index 4968f90607..8bc89892ab 100644
--- a/wcfsetup/install/files/lib/system/option/IntegerOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/IntegerOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/MessageOptionType.class.php b/wcfsetup/install/files/lib/system/option/MessageOptionType.class.php
index 76d5b4cc8f..75331b1bac 100644
--- a/wcfsetup/install/files/lib/system/option/MessageOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/MessageOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\smiley\SmileyCache;
diff --git a/wcfsetup/install/files/lib/system/option/MultiSelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/MultiSelectOptionType.class.php
index 45fc76b377..e439eb654b 100644
--- a/wcfsetup/install/files/lib/system/option/MultiSelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/MultiSelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/OptionHandler.class.php b/wcfsetup/install/files/lib/system/option/OptionHandler.class.php
index dd90541d4a..e177d8e1e5 100644
--- a/wcfsetup/install/files/lib/system/option/OptionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/option/OptionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\category\OptionCategory;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/option/PasswordOptionType.class.php b/wcfsetup/install/files/lib/system/option/PasswordOptionType.class.php
index 9f04ead5c2..0787de3c9c 100644
--- a/wcfsetup/install/files/lib/system/option/PasswordOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/PasswordOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/PaymentMethodSelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/PaymentMethodSelectOptionType.class.php
index 08c4e80713..34bdae1380 100644
--- a/wcfsetup/install/files/lib/system/option/PaymentMethodSelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/PaymentMethodSelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php b/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php
index 60ccbed72a..1b0d6f7624 100644
--- a/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/SelectOptionType.class.php b/wcfsetup/install/files/lib/system/option/SelectOptionType.class.php
index 5c05a99cc6..4dd9befec0 100644
--- a/wcfsetup/install/files/lib/system/option/SelectOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/SelectOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/option/TextI18nOptionType.class.php b/wcfsetup/install/files/lib/system/option/TextI18nOptionType.class.php
index 1c1476a252..512bb3968c 100644
--- a/wcfsetup/install/files/lib/system/option/TextI18nOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/TextI18nOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/TextOptionType.class.php b/wcfsetup/install/files/lib/system/option/TextOptionType.class.php
index b18a448e47..1744fe8b2e 100644
--- a/wcfsetup/install/files/lib/system/option/TextOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/TextOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/TextareaI18nOptionType.class.php b/wcfsetup/install/files/lib/system/option/TextareaI18nOptionType.class.php
index f567f4993c..e10c8141fe 100644
--- a/wcfsetup/install/files/lib/system/option/TextareaI18nOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/TextareaI18nOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/TextareaIpAddressOptionType.class.php b/wcfsetup/install/files/lib/system/option/TextareaIpAddressOptionType.class.php
index 5e1c3dcc12..875cd519d7 100644
--- a/wcfsetup/install/files/lib/system/option/TextareaIpAddressOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/TextareaIpAddressOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/TextareaOptionType.class.php b/wcfsetup/install/files/lib/system/option/TextareaOptionType.class.php
index 4d39541c5c..0070c19b13 100644
--- a/wcfsetup/install/files/lib/system/option/TextareaOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/TextareaOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/option/TimezoneOptionType.class.php b/wcfsetup/install/files/lib/system/option/TimezoneOptionType.class.php
index 5081a79696..dc6ac11464 100644
--- a/wcfsetup/install/files/lib/system/option/TimezoneOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/TimezoneOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/URLOptionType.class.php b/wcfsetup/install/files/lib/system/option/URLOptionType.class.php
index 8f63b8889e..da5bfccb52 100644
--- a/wcfsetup/install/files/lib/system/option/URLOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/URLOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 
diff --git a/wcfsetup/install/files/lib/system/option/UserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/UserGroupOptionType.class.php
index 6510faf397..102aed4f97 100644
--- a/wcfsetup/install/files/lib/system/option/UserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/UserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\system\option\user\group\UserGroupsUserGroupOptionType;
 
diff --git a/wcfsetup/install/files/lib/system/option/UseroptionsOptionType.class.php b/wcfsetup/install/files/lib/system/option/UseroptionsOptionType.class.php
index 43f946b203..3346efbed7 100644
--- a/wcfsetup/install/files/lib/system/option/UseroptionsOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/UseroptionsOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option;
 use wcf\data\option\Option;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/option/user/BirthdayUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/BirthdayUserOptionOutput.class.php
index f9eaa24752..6eda3589a6 100644
--- a/wcfsetup/install/files/lib/system/option/user/BirthdayUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/BirthdayUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/DateUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/DateUserOptionOutput.class.php
index 298a1dfaae..77e6db3635 100644
--- a/wcfsetup/install/files/lib/system/option/user/DateUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/DateUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/FacebookUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/FacebookUserOptionOutput.class.php
index 66ae8241ce..a67e7fbf66 100644
--- a/wcfsetup/install/files/lib/system/option/user/FacebookUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/FacebookUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/FloatUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/FloatUserOptionOutput.class.php
index f9cef2130c..af2fc8bb22 100644
--- a/wcfsetup/install/files/lib/system/option/user/FloatUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/FloatUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/GooglePlusUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/GooglePlusUserOptionOutput.class.php
index cf34ab84d3..b8cc571041 100644
--- a/wcfsetup/install/files/lib/system/option/user/GooglePlusUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/GooglePlusUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/IUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/IUserOptionOutput.class.php
index eca44ae3b3..1f491d2083 100644
--- a/wcfsetup/install/files/lib/system/option/user/IUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/IUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/ImageUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/ImageUserOptionOutput.class.php
index 84f9c7dd7d..222c1ded13 100644
--- a/wcfsetup/install/files/lib/system/option/user/ImageUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/ImageUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/MessageUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/MessageUserOptionOutput.class.php
index e409faaad2..5e33edbddc 100644
--- a/wcfsetup/install/files/lib/system/option/user/MessageUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/MessageUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/NewlineToBreakUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/NewlineToBreakUserOptionOutput.class.php
index d5fff98380..506933f9de 100644
--- a/wcfsetup/install/files/lib/system/option/user/NewlineToBreakUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/NewlineToBreakUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/SelectOptionsUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/SelectOptionsUserOptionOutput.class.php
index e5033766c5..275107bade 100644
--- a/wcfsetup/install/files/lib/system/option/user/SelectOptionsUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/SelectOptionsUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/TwitterUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/TwitterUserOptionOutput.class.php
index 9f77fc8c8b..a0c1d09257 100644
--- a/wcfsetup/install/files/lib/system/option/user/TwitterUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/TwitterUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/URLUserOptionOutput.class.php b/wcfsetup/install/files/lib/system/option/user/URLUserOptionOutput.class.php
index b111ee051e..cb594b4ad9 100644
--- a/wcfsetup/install/files/lib/system/option/user/URLUserOptionOutput.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/URLUserOptionOutput.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\user\option\UserOption;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/option/user/UserOptionHandler.class.php b/wcfsetup/install/files/lib/system/option/user/UserOptionHandler.class.php
index fe96fce25c..97143dd3c1 100644
--- a/wcfsetup/install/files/lib/system/option/user/UserOptionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/UserOptionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user;
 use wcf\data\option\category\OptionCategory;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/option/user/group/BBCodeSelectUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/BBCodeSelectUserGroupOptionType.class.php
index 4193e68f18..0d2a6f5366 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/BBCodeSelectUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/BBCodeSelectUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\data\bbcode\BBCodeCache;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/option/user/group/BooleanUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/BooleanUserGroupOptionType.class.php
index cf006f816c..72ffd25e98 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/BooleanUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/BooleanUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\data\option\Option;
 use wcf\system\option\BooleanOptionType;
diff --git a/wcfsetup/install/files/lib/system/option/user/group/FileSizeUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/FileSizeUserGroupOptionType.class.php
index d62ed65c23..d76358d039 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/FileSizeUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/FileSizeUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\system\option\FileSizeOptionType;
 
diff --git a/wcfsetup/install/files/lib/system/option/user/group/IUserGroupGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/IUserGroupGroupOptionType.class.php
index c24a349e51..39241690e1 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/IUserGroupGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/IUserGroupGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\data\user\group\UserGroup;
 
diff --git a/wcfsetup/install/files/lib/system/option/user/group/IUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/IUserGroupOptionType.class.php
index a2f0f86de2..0f843efc4a 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/IUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/IUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\system\option\IOptionType;
 
diff --git a/wcfsetup/install/files/lib/system/option/user/group/InfiniteIntegerUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/InfiniteIntegerUserGroupOptionType.class.php
index 77fb81a93d..5924a14695 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/InfiniteIntegerUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/InfiniteIntegerUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/option/user/group/InfiniteInverseIntegerUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/InfiniteInverseIntegerUserGroupOptionType.class.php
index d1979a8f1b..3a54b133c2 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/InfiniteInverseIntegerUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/InfiniteInverseIntegerUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/option/user/group/IntegerUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/IntegerUserGroupOptionType.class.php
index afe2e2c23f..7ab0c95c10 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/IntegerUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/IntegerUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\system\option\IntegerOptionType;
 
diff --git a/wcfsetup/install/files/lib/system/option/user/group/InverseIntegerUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/InverseIntegerUserGroupOptionType.class.php
index 1e35718f3b..0668e34816 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/InverseIntegerUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/InverseIntegerUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\system\option\IntegerOptionType;
 
diff --git a/wcfsetup/install/files/lib/system/option/user/group/TUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/TUserGroupOptionType.class.php
index a9c0d0757d..b152b27ad0 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/TUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/TUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\data\user\group\UserGroup;
 
diff --git a/wcfsetup/install/files/lib/system/option/user/group/TextUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/TextUserGroupOptionType.class.php
index 9d3c20c10e..1e6c41242b 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/TextUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/TextUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\system\option\TextOptionType;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/option/user/group/TextareaUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/TextareaUserGroupOptionType.class.php
index 05fbbec9c6..fcaf34179c 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/TextareaUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/TextareaUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\system\option\TextareaOptionType;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/option/user/group/UserGroupOptionHandler.class.php b/wcfsetup/install/files/lib/system/option/user/group/UserGroupOptionHandler.class.php
index efbab10509..94f63f3af2 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/UserGroupOptionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/UserGroupOptionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\data\option\Option;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/system/option/user/group/UserGroupsUserGroupOptionType.class.php b/wcfsetup/install/files/lib/system/option/user/group/UserGroupsUserGroupOptionType.class.php
index bb2bc7d4dc..f206fdbd79 100644
--- a/wcfsetup/install/files/lib/system/option/user/group/UserGroupsUserGroupOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/user/group/UserGroupsUserGroupOptionType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\option\user\group;
 use wcf\data\option\Option;
 use wcf\data\user\group\UserGroup;
diff --git a/wcfsetup/install/files/lib/system/package/ACPTemplatesFileHandler.class.php b/wcfsetup/install/files/lib/system/package/ACPTemplatesFileHandler.class.php
index bb793ddef3..b49f5caa7e 100644
--- a/wcfsetup/install/files/lib/system/package/ACPTemplatesFileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/package/ACPTemplatesFileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\Package;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/FilesFileHandler.class.php b/wcfsetup/install/files/lib/system/package/FilesFileHandler.class.php
index 31b3825a95..be93ef008f 100644
--- a/wcfsetup/install/files/lib/system/package/FilesFileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/package/FilesFileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\Package;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/PackageArchive.class.php b/wcfsetup/install/files/lib/system/package/PackageArchive.class.php
index 82077a993f..2b2c820db1 100644
--- a/wcfsetup/install/files/lib/system/package/PackageArchive.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageArchive.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\Package;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php
index 534562c81d..4839fc7421 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationDispatcher.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\application\Application;
 use wcf\data\application\ApplicationEditor;
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationFileHandler.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationFileHandler.class.php
index 887235aac0..8e7ba46d8c 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationFileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationFileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\system\setup\IFileHandler;
 
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationFormManager.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationFormManager.class.php
index 49c3bd5500..f42af4f266 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationFormManager.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationFormManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
 use wcf\system\form\FormDocument;
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationNodeBuilder.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationNodeBuilder.class.php
index f27bb6658d..34569e4da7 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationNodeBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationNodeBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\installation\queue\PackageInstallationQueueEditor;
 use wcf\data\package\installation\queue\PackageInstallationQueueList;
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationSQLParser.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationSQLParser.class.php
index 5bf1920a85..c80e36fc2f 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationSQLParser.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationSQLParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\Package;
 use wcf\system\database\util\SQLParser;
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php
index 13bffe5298..516593fbf8 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\update\server\PackageUpdateServer;
 use wcf\data\package\update\PackageUpdate;
diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationStep.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationStep.class.php
index 100ecc3ba3..0db3978af3 100644
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationStep.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationStep.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\system\form\FormDocument;
 
diff --git a/wcfsetup/install/files/lib/system/package/PackageUninstallationDispatcher.class.php b/wcfsetup/install/files/lib/system/package/PackageUninstallationDispatcher.class.php
index d1334a1bf9..7f8b581abf 100644
--- a/wcfsetup/install/files/lib/system/package/PackageUninstallationDispatcher.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageUninstallationDispatcher.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\option\OptionEditor;
 use wcf\data\package\installation\queue\PackageInstallationQueue;
diff --git a/wcfsetup/install/files/lib/system/package/PackageUninstallationNodeBuilder.class.php b/wcfsetup/install/files/lib/system/package/PackageUninstallationNodeBuilder.class.php
index 3c4ff48ff2..3fb76fa053 100644
--- a/wcfsetup/install/files/lib/system/package/PackageUninstallationNodeBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageUninstallationNodeBuilder.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/package/PackageUpdateDispatcher.class.php b/wcfsetup/install/files/lib/system/package/PackageUpdateDispatcher.class.php
index cab9339c9a..f16a31e6bb 100644
--- a/wcfsetup/install/files/lib/system/package/PackageUpdateDispatcher.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageUpdateDispatcher.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\update\server\PackageUpdateServer;
 use wcf\data\package\update\server\PackageUpdateServerEditor;
diff --git a/wcfsetup/install/files/lib/system/package/PackageUpdateUnauthorizedException.class.php b/wcfsetup/install/files/lib/system/package/PackageUpdateUnauthorizedException.class.php
index 636d6c1e32..b5765f5731 100644
--- a/wcfsetup/install/files/lib/system/package/PackageUpdateUnauthorizedException.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageUpdateUnauthorizedException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\data\package\update\server\PackageUpdateServer;
 use wcf\system\exception\UserException;
diff --git a/wcfsetup/install/files/lib/system/package/SplitNodeException.class.php b/wcfsetup/install/files/lib/system/package/SplitNodeException.class.php
index 83ba7db888..9e2fff8752 100644
--- a/wcfsetup/install/files/lib/system/package/SplitNodeException.class.php
+++ b/wcfsetup/install/files/lib/system/package/SplitNodeException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/package/TemplatesFileHandler.class.php b/wcfsetup/install/files/lib/system/package/TemplatesFileHandler.class.php
index a8c008c2e2..b9378a5095 100644
--- a/wcfsetup/install/files/lib/system/package/TemplatesFileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/package/TemplatesFileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php
index d29f080f1c..769d41fddc 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACLOptionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\acl\option\ACLOptionEditor;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACPMenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACPMenuPackageInstallationPlugin.class.php
index 430d90142e..a029cf0f06 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACPMenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACPMenuPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\acp\menu\item\ACPMenuItemEditor;
 
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php
index 628ce07b4d..2aae94142e 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACPSearchProviderPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\acp\search\provider\ACPSearchProviderEditor;
 use wcf\system\cache\builder\ACPSearchProviderCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php
index a9828f7a4d..507751f4ba 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ACPTemplatePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\application\Application;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php
index 324bca4c57..97279d32d1 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/AbstractMenuPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php
index db13873e13..3d60d93405 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/AbstractOptionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\package\Package;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/AbstractPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/AbstractPackageInstallationPlugin.class.php
index 7cfc5435e5..03cf5a12a5 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/AbstractPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/AbstractPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\system\event\EventHandler;
 use wcf\system\package\PackageArchive;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/AbstractXMLPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/AbstractXMLPackageInstallationPlugin.class.php
index 0daf0e0286..6eaba493ca 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/AbstractXMLPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/AbstractXMLPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php
index faf2e3b04a..6fb4175a83 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/BBCodePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\bbcode\attribute\BBCodeAttributeEditor;
 use wcf\data\bbcode\BBCode;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php
index 32821ae57c..91abca057d 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/BoxPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\box\Box;
 use wcf\data\box\BoxEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php
index 4a5de19fb1..09deb04237 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ClipboardActionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\clipboard\action\ClipboardAction;
 use wcf\data\clipboard\action\ClipboardActionEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php
index f29651f95b..8bcd43e090 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/CoreObjectPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\core\object\CoreObjectEditor;
 use wcf\system\cache\builder\CoreObjectCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php
index a3a24f6e89..6d13f0f914 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/CronjobPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\cronjob\Cronjob;
 use wcf\data\cronjob\CronjobEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php
index 740cd91272..b4f2d8a410 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/EventListenerPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\event\listener\EventListener;
 use wcf\data\event\listener\EventListenerEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php
index 40da096c40..0228cc31e9 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/FilePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\application\Application;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/IPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/IPackageInstallationPlugin.class.php
index 14b6f09d09..d0f89ebb01 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/IPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/IPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\system\package\PackageArchive;
 
diff --git a/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php
index ef9003f34f..8ef459e05a 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/LanguagePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\language\Language;
 use wcf\data\language\LanguageEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/MediaProviderPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/MediaProviderPackageInstallationPlugin.class.php
index 725efc1b8a..235d1927fc 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/MediaProviderPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/MediaProviderPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\bbcode\media\provider\BBCodeMediaProviderEditor;
 use wcf\system\cache\builder\BBCodeMediaProviderCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php
index 7d89ca0e5c..e36b9e8a8f 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/MenuItemPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\menu\item\MenuItem;
 use wcf\data\menu\item\MenuItemEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php
index 44d986f6b4..36b855bd24 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/MenuPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\box\Box;
 use wcf\data\box\BoxEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php
index 87a33b9952..277bf162f0 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypeDefinitionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\object\type\definition\ObjectTypeDefinitionEditor;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php
index 527317f395..fdcae0c32f 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ObjectTypePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\object\type\ObjectTypeEditor;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php
index 190106f4b9..7b071a4096 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/OptionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\option\Option;
 use wcf\data\option\OptionEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php
index feef16a0de..04faa4b339 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/PIPPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\package\installation\plugin\PackageInstallationPluginEditor;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php
index cf6e518295..8983938997 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/PagePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\package\PackageCache;
 use wcf\data\page\Page;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/SQLPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/SQLPackageInstallationPlugin.class.php
index 323be78464..364d75edfd 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/SQLPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/SQLPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\package\Package;
 use wcf\data\package\PackageList;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/ScriptPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/ScriptPackageInstallationPlugin.class.php
index 527c216836..55b7020a95 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/ScriptPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/ScriptPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\system\cache\CacheHandler;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php
index ceb5dae0e6..99c464d875 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/SmileyPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\smiley\SmileyEditor;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/StylePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/StylePackageInstallationPlugin.class.php
index f86a097a63..45f721319f 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/StylePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/StylePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\style\StyleEditor;
 use wcf\data\style\StyleList;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php
index 151f2cde94..74c8aadc60 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/TemplateListenerPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\template\listener\TemplateListenerEditor;
 use wcf\system\cache\builder\TemplateListenerCodeCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php
index 61302b2aea..272a873a87 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/TemplatePackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\application\Application;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php
index ba5dc0667d..1b9ec670b2 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserGroupOptionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\user\group\option\UserGroupOption;
 use wcf\data\user\group\option\UserGroupOptionEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserMenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserMenuPackageInstallationPlugin.class.php
index b2c215e43d..3260aea426 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserMenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserMenuPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\user\menu\item\UserMenuItemEditor;
 
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php
index bab2696873..07db3e1ca9 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserNotificationEventPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\user\notification\event\UserNotificationEvent;
 use wcf\data\user\notification\event\UserNotificationEventEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php
index 3f509b99a8..07afa9f533 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserOptionPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\user\option\category\UserOptionCategory;
 use wcf\data\user\option\category\UserOptionCategoryEditor;
diff --git a/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php b/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php
index cb94b961f6..7ddb8c691f 100644
--- a/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php
+++ b/wcfsetup/install/files/lib/system/package/plugin/UserProfileMenuPackageInstallationPlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\plugin;
 use wcf\data\user\profile\menu\item\UserProfileMenuItemEditor;
 use wcf\system\devtools\pip\IIdempotentPackageInstallationPlugin;
diff --git a/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php b/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php
index 2b18a8ef26..63125ece17 100644
--- a/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php
+++ b/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\validation;
 use wcf\data\package\Package;
 use wcf\data\package\PackageCache;
diff --git a/wcfsetup/install/files/lib/system/package/validation/PackageValidationException.class.php b/wcfsetup/install/files/lib/system/package/validation/PackageValidationException.class.php
index 6c16caa7eb..8a170c0706 100644
--- a/wcfsetup/install/files/lib/system/package/validation/PackageValidationException.class.php
+++ b/wcfsetup/install/files/lib/system/package/validation/PackageValidationException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\validation;
 use wcf\system\exception\SystemException;
 use wcf\system\package\PackageArchive;
diff --git a/wcfsetup/install/files/lib/system/package/validation/PackageValidationManager.class.php b/wcfsetup/install/files/lib/system/package/validation/PackageValidationManager.class.php
index f0ed7bc390..2bba6153fe 100644
--- a/wcfsetup/install/files/lib/system/package/validation/PackageValidationManager.class.php
+++ b/wcfsetup/install/files/lib/system/package/validation/PackageValidationManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\package\validation;
 use wcf\data\package\installation\plugin\PackageInstallationPluginList;
 use wcf\data\package\Package;
diff --git a/wcfsetup/install/files/lib/system/page/PageLocationManager.class.php b/wcfsetup/install/files/lib/system/page/PageLocationManager.class.php
index 77b1154ec3..6e7bfca71a 100644
--- a/wcfsetup/install/files/lib/system/page/PageLocationManager.class.php
+++ b/wcfsetup/install/files/lib/system/page/PageLocationManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page;
 use wcf\data\page\PageCache;
 use wcf\data\ITitledLinkObject;
diff --git a/wcfsetup/install/files/lib/system/page/ParentPageLocation.class.php b/wcfsetup/install/files/lib/system/page/ParentPageLocation.class.php
index bbcefd2de1..c8e6072188 100644
--- a/wcfsetup/install/files/lib/system/page/ParentPageLocation.class.php
+++ b/wcfsetup/install/files/lib/system/page/ParentPageLocation.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page;
 use wcf\data\ITitledLinkObject;
 
diff --git a/wcfsetup/install/files/lib/system/page/handler/AbstractLookupPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/AbstractLookupPageHandler.class.php
index 264cab9bbc..7b6dde0f6f 100644
--- a/wcfsetup/install/files/lib/system/page/handler/AbstractLookupPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/AbstractLookupPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/page/handler/AbstractMenuPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/AbstractMenuPageHandler.class.php
index 7f84aa14f2..68130d85de 100644
--- a/wcfsetup/install/files/lib/system/page/handler/AbstractMenuPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/AbstractMenuPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/page/handler/ArticleListPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/ArticleListPageHandler.class.php
index d7d2ddd6f5..65ac866198 100644
--- a/wcfsetup/install/files/lib/system/page/handler/ArticleListPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/ArticleListPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\article\ViewableArticle;
 
diff --git a/wcfsetup/install/files/lib/system/page/handler/ArticlePageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/ArticlePageHandler.class.php
index 29c95c2458..fb6e56300e 100644
--- a/wcfsetup/install/files/lib/system/page/handler/ArticlePageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/ArticlePageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\article\ViewableArticleList;
 use wcf\data\page\Page;
diff --git a/wcfsetup/install/files/lib/system/page/handler/CategoryArticleListPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/CategoryArticleListPageHandler.class.php
index 6ad9a1ccd2..f922517e8a 100644
--- a/wcfsetup/install/files/lib/system/page/handler/CategoryArticleListPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/CategoryArticleListPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\article\category\ArticleCategory;
 
diff --git a/wcfsetup/install/files/lib/system/page/handler/ILookupPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/ILookupPageHandler.class.php
index 378dfae38a..d0dd9fd1a1 100644
--- a/wcfsetup/install/files/lib/system/page/handler/ILookupPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/ILookupPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/page/handler/IMenuPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/IMenuPageHandler.class.php
index f1884ca651..08cfbb3e1d 100644
--- a/wcfsetup/install/files/lib/system/page/handler/IMenuPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/IMenuPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/page/handler/IOnlineLocationPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/IOnlineLocationPageHandler.class.php
index ff1ac7b49a..b23703a67c 100644
--- a/wcfsetup/install/files/lib/system/page/handler/IOnlineLocationPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/IOnlineLocationPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\page\Page;
 use wcf\data\user\online\UserOnline;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryLookupPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryLookupPageHandler.class.php
index 80033488f8..9128b4df57 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryLookupPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryLookupPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryMenuPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryMenuPageHandler.class.php
index 6e39777eb8..4db2c58604 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryMenuPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryMenuPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\data\IAccessibleObject;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationLookupPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationLookupPageHandler.class.php
index 58714d3ef3..38725f7e23 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationLookupPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationLookupPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationPageHandler.class.php
index 2ccd971102..6be698535f 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TDecoratedCategoryOnlineLocationPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\category\AbstractDecoratedCategory;
 use wcf\data\page\Page;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TOnlineLocationPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TOnlineLocationPageHandler.class.php
index 36f9081270..bfd5972d8a 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TOnlineLocationPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TOnlineLocationPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\page\Page;
 use wcf\data\user\online\UserOnline;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TUserLookupPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TUserLookupPageHandler.class.php
index 75fb3b83f7..1d74d138c9 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TUserLookupPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TUserLookupPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\user\UserProfileList;
 use wcf\system\cache\runtime\UserRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TUserOnlineLocationPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TUserOnlineLocationPageHandler.class.php
index 0e2a0e4dad..fe3a483b4a 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TUserOnlineLocationPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TUserOnlineLocationPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\page\Page;
 use wcf\data\user\online\UserOnline;
diff --git a/wcfsetup/install/files/lib/system/page/handler/TrophyListPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TrophyListPageHandler.class.php
index 7182263987..d5db4e5cdb 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TrophyListPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TrophyListPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\trophy\category\TrophyCategory;
 
diff --git a/wcfsetup/install/files/lib/system/page/handler/TrophyPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/TrophyPageHandler.class.php
index 08b0c0f7be..37166f7861 100644
--- a/wcfsetup/install/files/lib/system/page/handler/TrophyPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/TrophyPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\data\trophy\TrophyCache;
 use wcf\data\trophy\TrophyList;
diff --git a/wcfsetup/install/files/lib/system/page/handler/UserPageHandler.class.php b/wcfsetup/install/files/lib/system/page/handler/UserPageHandler.class.php
index 31f6c877e0..519d3b6feb 100644
--- a/wcfsetup/install/files/lib/system/page/handler/UserPageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/page/handler/UserPageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\page\handler;
 use wcf\system\cache\runtime\UserRuntimeCache;
 
diff --git a/wcfsetup/install/files/lib/system/payment/method/AbstractPaymentMethod.class.php b/wcfsetup/install/files/lib/system/payment/method/AbstractPaymentMethod.class.php
index d4cdc7546b..db0a9cf75d 100644
--- a/wcfsetup/install/files/lib/system/payment/method/AbstractPaymentMethod.class.php
+++ b/wcfsetup/install/files/lib/system/payment/method/AbstractPaymentMethod.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\method;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/payment/method/IPaymentMethod.class.php b/wcfsetup/install/files/lib/system/payment/method/IPaymentMethod.class.php
index 83e7fee6a4..822b0b6d6d 100644
--- a/wcfsetup/install/files/lib/system/payment/method/IPaymentMethod.class.php
+++ b/wcfsetup/install/files/lib/system/payment/method/IPaymentMethod.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\method;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/payment/method/PaymentMethodHandler.class.php b/wcfsetup/install/files/lib/system/payment/method/PaymentMethodHandler.class.php
index 4afeef40af..c7394c5cd1 100644
--- a/wcfsetup/install/files/lib/system/payment/method/PaymentMethodHandler.class.php
+++ b/wcfsetup/install/files/lib/system/payment/method/PaymentMethodHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\method;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/payment/method/PaypalPaymentMethod.class.php b/wcfsetup/install/files/lib/system/payment/method/PaypalPaymentMethod.class.php
index 0ef01586df..0bccc20ad6 100644
--- a/wcfsetup/install/files/lib/system/payment/method/PaypalPaymentMethod.class.php
+++ b/wcfsetup/install/files/lib/system/payment/method/PaypalPaymentMethod.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\method;
 use wcf\system\request\LinkHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/payment/type/AbstractPaymentType.class.php b/wcfsetup/install/files/lib/system/payment/type/AbstractPaymentType.class.php
index 1fcda5db3f..c4dff73ef1 100644
--- a/wcfsetup/install/files/lib/system/payment/type/AbstractPaymentType.class.php
+++ b/wcfsetup/install/files/lib/system/payment/type/AbstractPaymentType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\type;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/payment/type/IPaymentType.class.php b/wcfsetup/install/files/lib/system/payment/type/IPaymentType.class.php
index 41c778a754..50245000b9 100644
--- a/wcfsetup/install/files/lib/system/payment/type/IPaymentType.class.php
+++ b/wcfsetup/install/files/lib/system/payment/type/IPaymentType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\type;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/payment/type/PaidSubscriptionPaymentType.class.php b/wcfsetup/install/files/lib/system/payment/type/PaidSubscriptionPaymentType.class.php
index bbb2ac67c2..f2c8998c11 100644
--- a/wcfsetup/install/files/lib/system/payment/type/PaidSubscriptionPaymentType.class.php
+++ b/wcfsetup/install/files/lib/system/payment/type/PaidSubscriptionPaymentType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\payment\type;
 use wcf\data\paid\subscription\transaction\log\PaidSubscriptionTransactionLog;
 use wcf\data\paid\subscription\transaction\log\PaidSubscriptionTransactionLogAction;
diff --git a/wcfsetup/install/files/lib/system/poll/AbstractPollHandler.class.php b/wcfsetup/install/files/lib/system/poll/AbstractPollHandler.class.php
index 9cfd469ea3..939192f47c 100644
--- a/wcfsetup/install/files/lib/system/poll/AbstractPollHandler.class.php
+++ b/wcfsetup/install/files/lib/system/poll/AbstractPollHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\poll;
 use wcf\system\SingletonFactory;
 
diff --git a/wcfsetup/install/files/lib/system/poll/IPollHandler.class.php b/wcfsetup/install/files/lib/system/poll/IPollHandler.class.php
index 173cc3ba56..44c2e6fb18 100644
--- a/wcfsetup/install/files/lib/system/poll/IPollHandler.class.php
+++ b/wcfsetup/install/files/lib/system/poll/IPollHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\poll;
 use wcf\data\poll\Poll;
 
diff --git a/wcfsetup/install/files/lib/system/poll/PollManager.class.php b/wcfsetup/install/files/lib/system/poll/PollManager.class.php
index a63c8d654f..4568432dec 100644
--- a/wcfsetup/install/files/lib/system/poll/PollManager.class.php
+++ b/wcfsetup/install/files/lib/system/poll/PollManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\poll;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandler.class.php b/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandler.class.php
index e94411eb5e..c94601339a 100644
--- a/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandler.class.php
+++ b/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\recaptcha;
 use wcf\system\exception\SystemException;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandlerV2.class.php b/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandlerV2.class.php
index c3d92fdc6f..edb5e5607d 100644
--- a/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandlerV2.class.php
+++ b/wcfsetup/install/files/lib/system/recaptcha/RecaptchaHandlerV2.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\recaptcha;
 use wcf\system\exception\UserInputException;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/registry/RegistryHandler.class.php b/wcfsetup/install/files/lib/system/registry/RegistryHandler.class.php
index db116cfb88..63db9d20c2 100644
--- a/wcfsetup/install/files/lib/system/registry/RegistryHandler.class.php
+++ b/wcfsetup/install/files/lib/system/registry/RegistryHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\registry;
 use wcf\data\package\PackageCache;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/request/ControllerMap.class.php b/wcfsetup/install/files/lib/system/request/ControllerMap.class.php
index 2ba8fa195a..5183f2021c 100644
--- a/wcfsetup/install/files/lib/system/request/ControllerMap.class.php
+++ b/wcfsetup/install/files/lib/system/request/ControllerMap.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request;
 use wcf\page\CmsPage;
 use wcf\system\cache\builder\RoutingCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/request/IRouteController.class.php b/wcfsetup/install/files/lib/system/request/IRouteController.class.php
index 73f76eaa5f..987f2c905c 100644
--- a/wcfsetup/install/files/lib/system/request/IRouteController.class.php
+++ b/wcfsetup/install/files/lib/system/request/IRouteController.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request;
 use wcf\data\ITitledObject;
 
diff --git a/wcfsetup/install/files/lib/system/request/LinkHandler.class.php b/wcfsetup/install/files/lib/system/request/LinkHandler.class.php
index 3204c100ce..9144b4880e 100644
--- a/wcfsetup/install/files/lib/system/request/LinkHandler.class.php
+++ b/wcfsetup/install/files/lib/system/request/LinkHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request;
 use wcf\data\page\PageCache;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/request/Request.class.php b/wcfsetup/install/files/lib/system/request/Request.class.php
index 21cbbaf8ba..4facd3e12e 100644
--- a/wcfsetup/install/files/lib/system/request/Request.class.php
+++ b/wcfsetup/install/files/lib/system/request/Request.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request;
 use wcf\data\page\PageCache;
 
diff --git a/wcfsetup/install/files/lib/system/request/RequestHandler.class.php b/wcfsetup/install/files/lib/system/request/RequestHandler.class.php
index e6e7b787cd..e36be3fe56 100644
--- a/wcfsetup/install/files/lib/system/request/RequestHandler.class.php
+++ b/wcfsetup/install/files/lib/system/request/RequestHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\box\BoxHandler;
diff --git a/wcfsetup/install/files/lib/system/request/RouteHandler.class.php b/wcfsetup/install/files/lib/system/request/RouteHandler.class.php
index 36aaab1da5..d11cb254b7 100644
--- a/wcfsetup/install/files/lib/system/request/RouteHandler.class.php
+++ b/wcfsetup/install/files/lib/system/request/RouteHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/request/route/DynamicRequestRoute.class.php b/wcfsetup/install/files/lib/system/request/route/DynamicRequestRoute.class.php
index fc6a61f049..12c31b201e 100644
--- a/wcfsetup/install/files/lib/system/request/route/DynamicRequestRoute.class.php
+++ b/wcfsetup/install/files/lib/system/request/route/DynamicRequestRoute.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request\route;
 use wcf\system\request\ControllerMap;
 use wcf\system\request\RequestHandler;
diff --git a/wcfsetup/install/files/lib/system/request/route/IRequestRoute.class.php b/wcfsetup/install/files/lib/system/request/route/IRequestRoute.class.php
index 8c5c70c179..042fe55836 100644
--- a/wcfsetup/install/files/lib/system/request/route/IRequestRoute.class.php
+++ b/wcfsetup/install/files/lib/system/request/route/IRequestRoute.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request\route;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/request/route/LookupRequestRoute.class.php b/wcfsetup/install/files/lib/system/request/route/LookupRequestRoute.class.php
index 00c219f649..4c6e5ff176 100644
--- a/wcfsetup/install/files/lib/system/request/route/LookupRequestRoute.class.php
+++ b/wcfsetup/install/files/lib/system/request/route/LookupRequestRoute.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request\route;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\request\ControllerMap;
diff --git a/wcfsetup/install/files/lib/system/request/route/StaticRequestRoute.class.php b/wcfsetup/install/files/lib/system/request/route/StaticRequestRoute.class.php
index 8c8af2888e..a48ed04594 100644
--- a/wcfsetup/install/files/lib/system/request/route/StaticRequestRoute.class.php
+++ b/wcfsetup/install/files/lib/system/request/route/StaticRequestRoute.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\request\route;
 use wcf\system\request\ControllerMap;
 
diff --git a/wcfsetup/install/files/lib/system/search/AbstractSearchEngine.class.php b/wcfsetup/install/files/lib/system/search/AbstractSearchEngine.class.php
index 6ee6cf88c5..52e0bfc8df 100644
--- a/wcfsetup/install/files/lib/system/search/AbstractSearchEngine.class.php
+++ b/wcfsetup/install/files/lib/system/search/AbstractSearchEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/search/AbstractSearchIndexManager.class.php b/wcfsetup/install/files/lib/system/search/AbstractSearchIndexManager.class.php
index bf9ff5f85e..8d01d942c7 100644
--- a/wcfsetup/install/files/lib/system/search/AbstractSearchIndexManager.class.php
+++ b/wcfsetup/install/files/lib/system/search/AbstractSearchIndexManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeList;
diff --git a/wcfsetup/install/files/lib/system/search/AbstractSearchableObjectType.class.php b/wcfsetup/install/files/lib/system/search/AbstractSearchableObjectType.class.php
index 731bb4e17b..9a11f110d0 100644
--- a/wcfsetup/install/files/lib/system/search/AbstractSearchableObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/search/AbstractSearchableObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 use wcf\form\IForm;
diff --git a/wcfsetup/install/files/lib/system/search/ArticleSearch.class.php b/wcfsetup/install/files/lib/system/search/ArticleSearch.class.php
index 7398a7ee43..5d35fb390d 100644
--- a/wcfsetup/install/files/lib/system/search/ArticleSearch.class.php
+++ b/wcfsetup/install/files/lib/system/search/ArticleSearch.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\article\content\SearchResultArticleContent;
diff --git a/wcfsetup/install/files/lib/system/search/ISearchEngine.class.php b/wcfsetup/install/files/lib/system/search/ISearchEngine.class.php
index 2e68cfaf03..1419a167a8 100644
--- a/wcfsetup/install/files/lib/system/search/ISearchEngine.class.php
+++ b/wcfsetup/install/files/lib/system/search/ISearchEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 
diff --git a/wcfsetup/install/files/lib/system/search/ISearchIndexManager.class.php b/wcfsetup/install/files/lib/system/search/ISearchIndexManager.class.php
index 0f5c51c5e6..24dc2532e1 100644
--- a/wcfsetup/install/files/lib/system/search/ISearchIndexManager.class.php
+++ b/wcfsetup/install/files/lib/system/search/ISearchIndexManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/search/ISearchableObjectType.class.php b/wcfsetup/install/files/lib/system/search/ISearchableObjectType.class.php
index cc9c56c848..ccb9b4c934 100644
--- a/wcfsetup/install/files/lib/system/search/ISearchableObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/search/ISearchableObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\search\ISearchResultObject;
 use wcf\form\IForm;
diff --git a/wcfsetup/install/files/lib/system/search/PageSearch.class.php b/wcfsetup/install/files/lib/system/search/PageSearch.class.php
index b6ce0067d6..ed2e85d62e 100644
--- a/wcfsetup/install/files/lib/system/search/PageSearch.class.php
+++ b/wcfsetup/install/files/lib/system/search/PageSearch.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\page\content\SearchResultPageContent;
diff --git a/wcfsetup/install/files/lib/system/search/SearchEngine.class.php b/wcfsetup/install/files/lib/system/search/SearchEngine.class.php
index 66ab96264c..4f63dfca01 100644
--- a/wcfsetup/install/files/lib/system/search/SearchEngine.class.php
+++ b/wcfsetup/install/files/lib/system/search/SearchEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/search/SearchIndexManager.class.php b/wcfsetup/install/files/lib/system/search/SearchIndexManager.class.php
index 8eaf082b1a..c9ef3c8b89 100644
--- a/wcfsetup/install/files/lib/system/search/SearchIndexManager.class.php
+++ b/wcfsetup/install/files/lib/system/search/SearchIndexManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/search/SearchKeywordManager.class.php b/wcfsetup/install/files/lib/system/search/SearchKeywordManager.class.php
index e168441fd2..3b8091e978 100644
--- a/wcfsetup/install/files/lib/system/search/SearchKeywordManager.class.php
+++ b/wcfsetup/install/files/lib/system/search/SearchKeywordManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\data\search\keyword\SearchKeyword;
 use wcf\data\search\keyword\SearchKeywordAction;
diff --git a/wcfsetup/install/files/lib/system/search/SearchResultTextParser.class.php b/wcfsetup/install/files/lib/system/search/SearchResultTextParser.class.php
index 04159f63a9..17fa53a376 100644
--- a/wcfsetup/install/files/lib/system/search/SearchResultTextParser.class.php
+++ b/wcfsetup/install/files/lib/system/search/SearchResultTextParser.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search;
 use wcf\system\bbcode\KeywordHighlighter;
 use wcf\system\Regex;
diff --git a/wcfsetup/install/files/lib/system/search/acp/ACPSearchHandler.class.php b/wcfsetup/install/files/lib/system/search/acp/ACPSearchHandler.class.php
index 079fabf232..2258afeabe 100644
--- a/wcfsetup/install/files/lib/system/search/acp/ACPSearchHandler.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/ACPSearchHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\acp\search\provider\ACPSearchProvider;
 use wcf\system\application\ApplicationHandler;
diff --git a/wcfsetup/install/files/lib/system/search/acp/ACPSearchResult.class.php b/wcfsetup/install/files/lib/system/search/acp/ACPSearchResult.class.php
index bee5d0f325..ca921a0d1f 100644
--- a/wcfsetup/install/files/lib/system/search/acp/ACPSearchResult.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/ACPSearchResult.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/search/acp/ACPSearchResultList.class.php b/wcfsetup/install/files/lib/system/search/acp/ACPSearchResultList.class.php
index bf3cd7e0e9..23a0a72736 100644
--- a/wcfsetup/install/files/lib/system/search/acp/ACPSearchResultList.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/ACPSearchResultList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/search/acp/AbstractACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/AbstractACPSearchResultProvider.class.php
index 9be1e01c61..00ff9bc6da 100644
--- a/wcfsetup/install/files/lib/system/search/acp/AbstractACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/AbstractACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\DatabaseObject;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php
index 6d6cfc5bf0..6ef613a6e5 100644
--- a/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\DatabaseObject;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/search/acp/ArticleACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/ArticleACPSearchResultProvider.class.php
index 3df777ef26..9c8d0f5878 100644
--- a/wcfsetup/install/files/lib/system/search/acp/ArticleACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/ArticleACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\article\content\ArticleContentList;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/system/search/acp/BoxACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/BoxACPSearchResultProvider.class.php
index 3abc3e5f31..5c075d526b 100644
--- a/wcfsetup/install/files/lib/system/search/acp/BoxACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/BoxACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\box\BoxList;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/system/search/acp/IACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/IACPSearchResultProvider.class.php
index a852d0baab..b29608dc9d 100644
--- a/wcfsetup/install/files/lib/system/search/acp/IACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/IACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/search/acp/MenuItemACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/MenuItemACPSearchResultProvider.class.php
index ccaf909037..ee9ef35a38 100644
--- a/wcfsetup/install/files/lib/system/search/acp/MenuItemACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/MenuItemACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\acp\menu\item\ACPMenuItem;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/search/acp/OptionACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/OptionACPSearchResultProvider.class.php
index 337939b85f..63c3e5ce3e 100644
--- a/wcfsetup/install/files/lib/system/search/acp/OptionACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/OptionACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\option\category\OptionCategoryList;
 use wcf\data\option\Option;
diff --git a/wcfsetup/install/files/lib/system/search/acp/PackageACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/PackageACPSearchResultProvider.class.php
index c4dfd8f13f..069ade0829 100644
--- a/wcfsetup/install/files/lib/system/search/acp/PackageACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/PackageACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\package\Package;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/search/acp/PageACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/PageACPSearchResultProvider.class.php
index ac07909524..08b95d2e01 100644
--- a/wcfsetup/install/files/lib/system/search/acp/PageACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/PageACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\page\PageList;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/system/search/acp/UserACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/UserACPSearchResultProvider.class.php
index cc9b03affb..67c7d4ccc0 100644
--- a/wcfsetup/install/files/lib/system/search/acp/UserACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/UserACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\user\group\UserGroup;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/system/search/acp/UserGroupOptionACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/UserGroupOptionACPSearchResultProvider.class.php
index 647183a972..1918f306f3 100644
--- a/wcfsetup/install/files/lib/system/search/acp/UserGroupOptionACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/UserGroupOptionACPSearchResultProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\acp;
 use wcf\data\user\group\option\category\UserGroupOptionCategoryList;
 use wcf\data\user\group\option\UserGroupOption;
diff --git a/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchEngine.class.php b/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchEngine.class.php
index 9b4df2f158..07786bf93d 100644
--- a/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchEngine.class.php
+++ b/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\mysql;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\database\DatabaseException;
diff --git a/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchIndexManager.class.php b/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchIndexManager.class.php
index e94226aeba..4807ccedd7 100644
--- a/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchIndexManager.class.php
+++ b/wcfsetup/install/files/lib/system/search/mysql/MysqlSearchIndexManager.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\search\mysql;
 use wcf\data\object\type\ObjectType;
 use wcf\system\search\AbstractSearchIndexManager;
diff --git a/wcfsetup/install/files/lib/system/session/ACPSessionFactory.class.php b/wcfsetup/install/files/lib/system/session/ACPSessionFactory.class.php
index 9712fb27ca..b76603582d 100644
--- a/wcfsetup/install/files/lib/system/session/ACPSessionFactory.class.php
+++ b/wcfsetup/install/files/lib/system/session/ACPSessionFactory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\session;
 use wcf\data\acp\session\ACPSessionEditor;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/session/AbstractSessionHandler.class.php b/wcfsetup/install/files/lib/system/session/AbstractSessionHandler.class.php
index ca1603da77..bf571a69be 100644
--- a/wcfsetup/install/files/lib/system/session/AbstractSessionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/session/AbstractSessionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\session;
 use wcf\system\SingletonFactory;
 
diff --git a/wcfsetup/install/files/lib/system/session/SessionFactory.class.php b/wcfsetup/install/files/lib/system/session/SessionFactory.class.php
index b87b526799..34e169b77d 100644
--- a/wcfsetup/install/files/lib/system/session/SessionFactory.class.php
+++ b/wcfsetup/install/files/lib/system/session/SessionFactory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\session;
 use wcf\data\session\SessionEditor;
 
diff --git a/wcfsetup/install/files/lib/system/session/SessionHandler.class.php b/wcfsetup/install/files/lib/system/session/SessionHandler.class.php
index 753ce6d6ed..8092d1ecd9 100644
--- a/wcfsetup/install/files/lib/system/session/SessionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/session/SessionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\session;
 use wcf\data\acp\session\virtual\ACPSessionVirtual;
 use wcf\data\acp\session\virtual\ACPSessionVirtualAction;
diff --git a/wcfsetup/install/files/lib/system/setup/IFileHandler.class.php b/wcfsetup/install/files/lib/system/setup/IFileHandler.class.php
index 65e2564094..6506db3753 100644
--- a/wcfsetup/install/files/lib/system/setup/IFileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/setup/IFileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\setup;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/setup/Installer.class.php b/wcfsetup/install/files/lib/system/setup/Installer.class.php
index a399bac31c..687552af17 100644
--- a/wcfsetup/install/files/lib/system/setup/Installer.class.php
+++ b/wcfsetup/install/files/lib/system/setup/Installer.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\setup;
 use wcf\system\exception\SystemException;
 use wcf\system\io\Tar;
diff --git a/wcfsetup/install/files/lib/system/setup/SetupFileHandler.class.php b/wcfsetup/install/files/lib/system/setup/SetupFileHandler.class.php
index 0bf01cd39b..1ff504f4f3 100644
--- a/wcfsetup/install/files/lib/system/setup/SetupFileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/setup/SetupFileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\setup;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/setup/Uninstaller.class.php b/wcfsetup/install/files/lib/system/setup/Uninstaller.class.php
index 9973a7750b..cec5070e5b 100644
--- a/wcfsetup/install/files/lib/system/setup/Uninstaller.class.php
+++ b/wcfsetup/install/files/lib/system/setup/Uninstaller.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\setup;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/AbstractSitemapObjectObjectType.class.php b/wcfsetup/install/files/lib/system/sitemap/object/AbstractSitemapObjectObjectType.class.php
index 7b1dabcaa6..acdf90c10e 100755
--- a/wcfsetup/install/files/lib/system/sitemap/object/AbstractSitemapObjectObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/AbstractSitemapObjectObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\DatabaseObject;
 
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/ArticleCategorySitemapObject.class.php b/wcfsetup/install/files/lib/system/sitemap/object/ArticleCategorySitemapObject.class.php
index 848567033d..2d1431db53 100644
--- a/wcfsetup/install/files/lib/system/sitemap/object/ArticleCategorySitemapObject.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/ArticleCategorySitemapObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\article\category\ArticleCategory;
 use wcf\data\category\CategoryList;
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/ArticleSitemapObject.class.php b/wcfsetup/install/files/lib/system/sitemap/object/ArticleSitemapObject.class.php
index 3d00d6fa00..d6eec7bcdf 100644
--- a/wcfsetup/install/files/lib/system/sitemap/object/ArticleSitemapObject.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/ArticleSitemapObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\article\content\ArticleContent;
 use wcf\data\DatabaseObject;
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/ISitemapObjectObjectType.class.php b/wcfsetup/install/files/lib/system/sitemap/object/ISitemapObjectObjectType.class.php
index ec844d6185..fa575ec888 100755
--- a/wcfsetup/install/files/lib/system/sitemap/object/ISitemapObjectObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/ISitemapObjectObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\DatabaseObject;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/MultilingualPageSitemapObject.class.php b/wcfsetup/install/files/lib/system/sitemap/object/MultilingualPageSitemapObject.class.php
index 5cc043af52..37806061bf 100644
--- a/wcfsetup/install/files/lib/system/sitemap/object/MultilingualPageSitemapObject.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/MultilingualPageSitemapObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\page\content\PageContent;
 use wcf\data\page\content\PageContentList;
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/SimplePageSitemapObject.class.php b/wcfsetup/install/files/lib/system/sitemap/object/SimplePageSitemapObject.class.php
index e9c9098623..2f0c83464b 100644
--- a/wcfsetup/install/files/lib/system/sitemap/object/SimplePageSitemapObject.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/SimplePageSitemapObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\page\Page;
 use wcf\data\page\PageList;
diff --git a/wcfsetup/install/files/lib/system/sitemap/object/UserSitemapObject.class.php b/wcfsetup/install/files/lib/system/sitemap/object/UserSitemapObject.class.php
index 345360c4c1..ea7b383117 100755
--- a/wcfsetup/install/files/lib/system/sitemap/object/UserSitemapObject.class.php
+++ b/wcfsetup/install/files/lib/system/sitemap/object/UserSitemapObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\sitemap\object;
 use wcf\data\user\User;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/stat/AbstractCommentStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/AbstractCommentStatDailyHandler.class.php
index d8378f6677..a169f69469 100644
--- a/wcfsetup/install/files/lib/system/stat/AbstractCommentStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/AbstractCommentStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 use wcf\system\comment\CommentHandler;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/stat/AbstractDiskUsageStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/AbstractDiskUsageStatDailyHandler.class.php
index eecab94717..784854937c 100644
--- a/wcfsetup/install/files/lib/system/stat/AbstractDiskUsageStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/AbstractDiskUsageStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/stat/AbstractStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/AbstractStatDailyHandler.class.php
index 547c87aec1..5a6ae446e0 100644
--- a/wcfsetup/install/files/lib/system/stat/AbstractStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/AbstractStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/stat/AttachmentDiskUsageStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/AttachmentDiskUsageStatDailyHandler.class.php
index 5cd1af6fe9..6c832c047b 100644
--- a/wcfsetup/install/files/lib/system/stat/AttachmentDiskUsageStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/AttachmentDiskUsageStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/stat/AttachmentStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/AttachmentStatDailyHandler.class.php
index b5e8ce0641..57ca5979a4 100644
--- a/wcfsetup/install/files/lib/system/stat/AttachmentStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/AttachmentStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/stat/DislikeStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/DislikeStatDailyHandler.class.php
index 6a240d0beb..8d50d86a99 100644
--- a/wcfsetup/install/files/lib/system/stat/DislikeStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/DislikeStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 use wcf\data\like\Like;
 
diff --git a/wcfsetup/install/files/lib/system/stat/IStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/IStatDailyHandler.class.php
index 5a21d3c6ec..7b492d90cb 100644
--- a/wcfsetup/install/files/lib/system/stat/IStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/IStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/stat/LikeStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/LikeStatDailyHandler.class.php
index 292cc5cc13..58c1429335 100644
--- a/wcfsetup/install/files/lib/system/stat/LikeStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/LikeStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 use wcf\data\like\Like;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/stat/UserProfileCommentStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/UserProfileCommentStatDailyHandler.class.php
index 5569f7fbac..ee5200d4f4 100644
--- a/wcfsetup/install/files/lib/system/stat/UserProfileCommentStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/UserProfileCommentStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/stat/UserStatDailyHandler.class.php b/wcfsetup/install/files/lib/system/stat/UserStatDailyHandler.class.php
index 4c63699b5f..62e496413d 100644
--- a/wcfsetup/install/files/lib/system/stat/UserStatDailyHandler.class.php
+++ b/wcfsetup/install/files/lib/system/stat/UserStatDailyHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\stat;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/style/StyleCompiler.class.php b/wcfsetup/install/files/lib/system/style/StyleCompiler.class.php
index 3fab5ad0a9..e9c8725154 100644
--- a/wcfsetup/install/files/lib/system/style/StyleCompiler.class.php
+++ b/wcfsetup/install/files/lib/system/style/StyleCompiler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\style;
 use Leafo\ScssPhp\Compiler;
 use wcf\data\application\Application;
diff --git a/wcfsetup/install/files/lib/system/style/StyleHandler.class.php b/wcfsetup/install/files/lib/system/style/StyleHandler.class.php
index 9721443897..adedc708a0 100644
--- a/wcfsetup/install/files/lib/system/style/StyleHandler.class.php
+++ b/wcfsetup/install/files/lib/system/style/StyleHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\style;
 use wcf\data\style\ActiveStyle;
 use wcf\data\style\Style;
diff --git a/wcfsetup/install/files/lib/system/tagging/AbstractTaggable.class.php b/wcfsetup/install/files/lib/system/tagging/AbstractTaggable.class.php
index e83908bdd9..94b9ab3d71 100644
--- a/wcfsetup/install/files/lib/system/tagging/AbstractTaggable.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/AbstractTaggable.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 
diff --git a/wcfsetup/install/files/lib/system/tagging/ITaggable.class.php b/wcfsetup/install/files/lib/system/tagging/ITaggable.class.php
index 614e2df2a6..dd242151a1 100644
--- a/wcfsetup/install/files/lib/system/tagging/ITaggable.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/ITaggable.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 use wcf\data\tag\Tag;
 
diff --git a/wcfsetup/install/files/lib/system/tagging/ITagged.class.php b/wcfsetup/install/files/lib/system/tagging/ITagged.class.php
index 92b1d5e58c..7a6fb989fe 100644
--- a/wcfsetup/install/files/lib/system/tagging/ITagged.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/ITagged.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/tagging/TagCloud.class.php b/wcfsetup/install/files/lib/system/tagging/TagCloud.class.php
index 11a2d155de..1cb6cf6077 100644
--- a/wcfsetup/install/files/lib/system/tagging/TagCloud.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/TagCloud.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 use wcf\data\tag\TagCloudTag;
 use wcf\system\cache\builder\TagCloudCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/tagging/TagEngine.class.php b/wcfsetup/install/files/lib/system/tagging/TagEngine.class.php
index 49c95436e2..d06c1ea9e3 100644
--- a/wcfsetup/install/files/lib/system/tagging/TagEngine.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/TagEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\data\tag\Tag;
diff --git a/wcfsetup/install/files/lib/system/tagging/TaggableArticle.class.php b/wcfsetup/install/files/lib/system/tagging/TaggableArticle.class.php
index 3a4f4f12bc..65344b6b8e 100644
--- a/wcfsetup/install/files/lib/system/tagging/TaggableArticle.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/TaggableArticle.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 use wcf\data\article\TaggedArticleList;
 use wcf\data\tag\Tag;
diff --git a/wcfsetup/install/files/lib/system/tagging/TypedTagCloud.class.php b/wcfsetup/install/files/lib/system/tagging/TypedTagCloud.class.php
index 6868633ed1..9d4a75f20c 100644
--- a/wcfsetup/install/files/lib/system/tagging/TypedTagCloud.class.php
+++ b/wcfsetup/install/files/lib/system/tagging/TypedTagCloud.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\tagging;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\cache\builder\TypedTagCloudCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/template/ACPTemplateEngine.class.php b/wcfsetup/install/files/lib/system/template/ACPTemplateEngine.class.php
index 593cc11a37..b453a2933a 100644
--- a/wcfsetup/install/files/lib/system/template/ACPTemplateEngine.class.php
+++ b/wcfsetup/install/files/lib/system/template/ACPTemplateEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 use wcf\system\application\ApplicationHandler;
 
diff --git a/wcfsetup/install/files/lib/system/template/EmailTemplateEngine.class.php b/wcfsetup/install/files/lib/system/template/EmailTemplateEngine.class.php
index 010458566a..423767561d 100644
--- a/wcfsetup/install/files/lib/system/template/EmailTemplateEngine.class.php
+++ b/wcfsetup/install/files/lib/system/template/EmailTemplateEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/system/template/SetupTemplateCompiler.class.php b/wcfsetup/install/files/lib/system/template/SetupTemplateCompiler.class.php
index cfdcbdf3ad..f4d5201d84 100644
--- a/wcfsetup/install/files/lib/system/template/SetupTemplateCompiler.class.php
+++ b/wcfsetup/install/files/lib/system/template/SetupTemplateCompiler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/template/SetupTemplateEngine.class.php b/wcfsetup/install/files/lib/system/template/SetupTemplateEngine.class.php
index 70e2b8e3e0..23400f7fcd 100644
--- a/wcfsetup/install/files/lib/system/template/SetupTemplateEngine.class.php
+++ b/wcfsetup/install/files/lib/system/template/SetupTemplateEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/template/TemplateCompiler.class.php b/wcfsetup/install/files/lib/system/template/TemplateCompiler.class.php
index 1e3ddacd12..1f1cbd134e 100644
--- a/wcfsetup/install/files/lib/system/template/TemplateCompiler.class.php
+++ b/wcfsetup/install/files/lib/system/template/TemplateCompiler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 use wcf\system\io\AtomicWriter;
 
diff --git a/wcfsetup/install/files/lib/system/template/TemplateEngine.class.php b/wcfsetup/install/files/lib/system/template/TemplateEngine.class.php
index 5084db06b7..8ced406acd 100755
--- a/wcfsetup/install/files/lib/system/template/TemplateEngine.class.php
+++ b/wcfsetup/install/files/lib/system/template/TemplateEngine.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 use wcf\data\template\Template;
 use wcf\system\cache\builder\TemplateGroupCacheBuilder;
diff --git a/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php b/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php
index ae47ce22de..017e0d5bbd 100644
--- a/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php
+++ b/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template;
 use wcf\system\exception\SystemException;
 use wcf\system\template\plugin\ICompilerTemplatePlugin;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/AppendCompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/AppendCompilerTemplatePlugin.class.php
index 44e6005f1a..81a41c401a 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/AppendCompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/AppendCompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateScriptingCompiler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/AssignCompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/AssignCompilerTemplatePlugin.class.php
index 2de41a7ca3..fd44256b36 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/AssignCompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/AssignCompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateScriptingCompiler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/ConcatModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/ConcatModifierTemplatePlugin.class.php
index d200dc3167..89ca307d26 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/ConcatModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/ConcatModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateEngine;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/CounterFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/CounterFunctionTemplatePlugin.class.php
index 3911504390..1dc26f09e2 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/CounterFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/CounterFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/CurrencyModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/CurrencyModifierTemplatePlugin.class.php
index 476f91eebe..f2050212ed 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/CurrencyModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/CurrencyModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/CycleFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/CycleFunctionTemplatePlugin.class.php
index 618cb0fd6d..aaf2f20927 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/CycleFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/CycleFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateEngine;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/DateDiffModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/DateDiffModifierTemplatePlugin.class.php
index 4e472669d4..34cee0771f 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/DateDiffModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/DateDiffModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\DateUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/DateIntervalFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/DateIntervalFunctionTemplatePlugin.class.php
index ca8c6f32ce..0c43fb0c11 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/DateIntervalFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/DateIntervalFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\DateUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/DateModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/DateModifierTemplatePlugin.class.php
index 15aed724ed..aa2e057e5d 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/DateModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/DateModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\DateUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/EmbeddedObjectBlockTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/EmbeddedObjectBlockTemplatePlugin.class.php
index 9c9c2ccead..1a09228a42 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/EmbeddedObjectBlockTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/EmbeddedObjectBlockTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\html\simple\HtmlSimpleParser;
 use wcf\system\template\TemplateEngine;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/EncodeJSModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/EncodeJSModifierTemplatePlugin.class.php
index 91dcb5dd5d..532966a39e 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/EncodeJSModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/EncodeJSModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/EncodeJSONModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/EncodeJSONModifierTemplatePlugin.class.php
index 8ebbc4edea..7e0916173b 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/EncodeJSONModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/EncodeJSONModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/EscapeCDATAModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/EscapeCDATAModifierTemplatePlugin.class.php
index a4d239eeb4..9e2393eb9e 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/EscapeCDATAModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/EscapeCDATAModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/EventPrefilterTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/EventPrefilterTemplatePlugin.class.php
index 423df33093..2c8518aea2 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/EventPrefilterTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/EventPrefilterTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateScriptingCompiler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/FetchCompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/FetchCompilerTemplatePlugin.class.php
index 07e4fe262e..7aa45336ea 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/FetchCompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/FetchCompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateScriptingCompiler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/FilesizeBinaryModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/FilesizeBinaryModifierTemplatePlugin.class.php
index 26bbb9380f..d263602ca0 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/FilesizeBinaryModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/FilesizeBinaryModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/FilesizeModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/FilesizeModifierTemplatePlugin.class.php
index eee44fd144..7da7f5ac04 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/FilesizeModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/FilesizeModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\FileUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/HascontentPrefilterTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/HascontentPrefilterTemplatePlugin.class.php
index 515780a1c6..d8ae1a4c5d 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/HascontentPrefilterTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/HascontentPrefilterTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateScriptingCompiler;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/HtmlCheckboxesFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/HtmlCheckboxesFunctionTemplatePlugin.class.php
index 40329eb3a7..5f7234ae07 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/HtmlCheckboxesFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/HtmlCheckboxesFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateEngine;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/HtmlOptionsFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/HtmlOptionsFunctionTemplatePlugin.class.php
index e9c2eca99a..f0403f0b74 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/HtmlOptionsFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/HtmlOptionsFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\data\DatabaseObjectList;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/IBlockTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/IBlockTemplatePlugin.class.php
index 3c65abf37f..c52e055b0d 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/IBlockTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/IBlockTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/ICompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/ICompilerTemplatePlugin.class.php
index 7447c0b5fb..e2fd6854c1 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/ICompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/ICompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateScriptingCompiler;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/IFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/IFunctionTemplatePlugin.class.php
index a3512c1866..e6ebb2d4d0 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/IFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/IFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/IModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/IModifierTemplatePlugin.class.php
index 013e933904..77e44e135a 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/IModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/IModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/IPrefilterTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/IPrefilterTemplatePlugin.class.php
index c3d7e1820f..9559ed0e69 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/IPrefilterTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/IPrefilterTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateScriptingCompiler;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/ImplodeCompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/ImplodeCompilerTemplatePlugin.class.php
index d66b2545ef..f68f4a5700 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/ImplodeCompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/ImplodeCompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateScriptingCompiler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/JsFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/JsFunctionTemplatePlugin.class.php
index 548903d29f..c51b8d9c01 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/JsFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/JsFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\request\RequestHandler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/LangCompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/LangCompilerTemplatePlugin.class.php
index 1b9c405349..1d53298ed1 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/LangCompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/LangCompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateScriptingCompiler;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/LangPrefilterTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/LangPrefilterTemplatePlugin.class.php
index 3b46759aa6..3ed0db0502 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/LangPrefilterTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/LangPrefilterTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateScriptingCompiler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/LanguageModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/LanguageModifierTemplatePlugin.class.php
index 0b450ad694..e5509e03b3 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/LanguageModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/LanguageModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/LinkBlockTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/LinkBlockTemplatePlugin.class.php
index 0e2a987e08..180d3012b5 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/LinkBlockTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/LinkBlockTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\request\LinkHandler;
 use wcf\system\template\TemplateEngine;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/NewlineToBreakModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/NewlineToBreakModifierTemplatePlugin.class.php
index 019e098100..b80df9c168 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/NewlineToBreakModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/NewlineToBreakModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/PageBlockTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/PageBlockTemplatePlugin.class.php
index d809665602..4c354a6532 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/PageBlockTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/PageBlockTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\data\page\Page;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/PagesFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/PagesFunctionTemplatePlugin.class.php
index 493b3c6b79..dea7f3646c 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/PagesFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/PagesFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\request\LinkHandler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/PlainTimeModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/PlainTimeModifierTemplatePlugin.class.php
index 177d45db79..c17ed082c2 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/PlainTimeModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/PlainTimeModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/PrependCompilerTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/PrependCompilerTemplatePlugin.class.php
index 3f25f2cb16..4c26cdd9eb 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/PrependCompilerTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/PrependCompilerTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\exception\SystemException;
 use wcf\system\template\TemplateScriptingCompiler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/ShortUnitModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/ShortUnitModifierTemplatePlugin.class.php
index e4b27613cd..7ac9d83425 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/ShortUnitModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/ShortUnitModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/SimpleEmbeddedObjectPrefilterTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/SimpleEmbeddedObjectPrefilterTemplatePlugin.class.php
index b54c25bafd..2ac3b04cab 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/SimpleEmbeddedObjectPrefilterTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/SimpleEmbeddedObjectPrefilterTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\html\simple\HtmlSimpleParser;
 use wcf\system\template\TemplateScriptingCompiler;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/SmallpagesFunctionTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/SmallpagesFunctionTemplatePlugin.class.php
index 1e13c4caf9..ff3b9ac48a 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/SmallpagesFunctionTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/SmallpagesFunctionTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/TableWordwrapModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/TableWordwrapModifierTemplatePlugin.class.php
index 570167c97c..ca04cadb31 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/TableWordwrapModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/TableWordwrapModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 
diff --git a/wcfsetup/install/files/lib/system/template/plugin/TimeModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/TimeModifierTemplatePlugin.class.php
index d91fe99273..db50b82a2b 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/TimeModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/TimeModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\DateUtil;
diff --git a/wcfsetup/install/files/lib/system/template/plugin/TruncateModifierTemplatePlugin.class.php b/wcfsetup/install/files/lib/system/template/plugin/TruncateModifierTemplatePlugin.class.php
index 761d037481..06a545ac5c 100644
--- a/wcfsetup/install/files/lib/system/template/plugin/TruncateModifierTemplatePlugin.class.php
+++ b/wcfsetup/install/files/lib/system/template/plugin/TruncateModifierTemplatePlugin.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\template\plugin;
 use wcf\system\template\TemplateEngine;
 use wcf\util\StringUtil;
diff --git a/wcfsetup/install/files/lib/system/trophy/condition/TrophyConditionHandler.class.php b/wcfsetup/install/files/lib/system/trophy/condition/TrophyConditionHandler.class.php
index 878178b36f..51e3c06446 100644
--- a/wcfsetup/install/files/lib/system/trophy/condition/TrophyConditionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/trophy/condition/TrophyConditionHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\trophy\condition;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/upload/AvatarUploadFileValidationStrategy.class.php b/wcfsetup/install/files/lib/system/upload/AvatarUploadFileValidationStrategy.class.php
index f213a0808c..676adfc153 100644
--- a/wcfsetup/install/files/lib/system/upload/AvatarUploadFileValidationStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/AvatarUploadFileValidationStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 use wcf\data\user\avatar\UserAvatar;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/upload/DefaultUploadFileSaveStrategy.class.php b/wcfsetup/install/files/lib/system/upload/DefaultUploadFileSaveStrategy.class.php
index fbfa7c1681..9c0f85f446 100644
--- a/wcfsetup/install/files/lib/system/upload/DefaultUploadFileSaveStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/DefaultUploadFileSaveStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 use wcf\data\AbstractDatabaseObjectAction;
 use wcf\data\DatabaseObjectEditor;
diff --git a/wcfsetup/install/files/lib/system/upload/DefaultUploadFileValidationStrategy.class.php b/wcfsetup/install/files/lib/system/upload/DefaultUploadFileValidationStrategy.class.php
index 6874351d2d..1702c77c13 100644
--- a/wcfsetup/install/files/lib/system/upload/DefaultUploadFileValidationStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/DefaultUploadFileValidationStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/upload/IUploadFileSaveStrategy.class.php b/wcfsetup/install/files/lib/system/upload/IUploadFileSaveStrategy.class.php
index c8a3cb8150..cc0db8712d 100644
--- a/wcfsetup/install/files/lib/system/upload/IUploadFileSaveStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/IUploadFileSaveStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/upload/IUploadFileValidationStrategy.class.php b/wcfsetup/install/files/lib/system/upload/IUploadFileValidationStrategy.class.php
index 8654bc4708..627eb0d6f5 100644
--- a/wcfsetup/install/files/lib/system/upload/IUploadFileValidationStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/IUploadFileValidationStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/upload/MediaUploadFileValidationStrategy.class.php b/wcfsetup/install/files/lib/system/upload/MediaUploadFileValidationStrategy.class.php
index 1ab0d152ba..40923f8d96 100644
--- a/wcfsetup/install/files/lib/system/upload/MediaUploadFileValidationStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/MediaUploadFileValidationStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/upload/TrophyImageUploadFileValidationStrategy.class.php b/wcfsetup/install/files/lib/system/upload/TrophyImageUploadFileValidationStrategy.class.php
index fcd390ade7..2b2bd7a9be 100644
--- a/wcfsetup/install/files/lib/system/upload/TrophyImageUploadFileValidationStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/TrophyImageUploadFileValidationStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 use wcf\util\ImageUtil;
 
diff --git a/wcfsetup/install/files/lib/system/upload/UploadFile.class.php b/wcfsetup/install/files/lib/system/upload/UploadFile.class.php
index 5d460c76e8..491233d548 100644
--- a/wcfsetup/install/files/lib/system/upload/UploadFile.class.php
+++ b/wcfsetup/install/files/lib/system/upload/UploadFile.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/upload/UploadHandler.class.php b/wcfsetup/install/files/lib/system/upload/UploadHandler.class.php
index b77b3ee97f..5d66fdf27c 100644
--- a/wcfsetup/install/files/lib/system/upload/UploadHandler.class.php
+++ b/wcfsetup/install/files/lib/system/upload/UploadHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 use wcf\util\FileUtil;
 
diff --git a/wcfsetup/install/files/lib/system/upload/UserCoverPhotoUploadFileValidationStrategy.class.php b/wcfsetup/install/files/lib/system/upload/UserCoverPhotoUploadFileValidationStrategy.class.php
index 373604b5c4..4ce1166c02 100644
--- a/wcfsetup/install/files/lib/system/upload/UserCoverPhotoUploadFileValidationStrategy.class.php
+++ b/wcfsetup/install/files/lib/system/upload/UserCoverPhotoUploadFileValidationStrategy.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\upload;
 use wcf\data\user\cover\photo\UserCoverPhoto;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/user/GroupedUserList.class.php b/wcfsetup/install/files/lib/system/user/GroupedUserList.class.php
index b47239e2b7..c673369305 100644
--- a/wcfsetup/install/files/lib/system/user/GroupedUserList.class.php
+++ b/wcfsetup/install/files/lib/system/user/GroupedUserList.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user;
 use wcf\data\user\UserProfile;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php b/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php
index 9ccbdd03dc..fcb93a5e97 100644
--- a/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php
+++ b/wcfsetup/install/files/lib/system/user/UserBirthdayCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user;
 use wcf\system\cache\builder\UserBirthdayCacheBuilder;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/user/UserProfileHandler.class.php b/wcfsetup/install/files/lib/system/user/UserProfileHandler.class.php
index 923ffe6f48..03ef6ff05b 100644
--- a/wcfsetup/install/files/lib/system/user/UserProfileHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/UserProfileHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user;
 use wcf\data\user\User;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentResponseUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentResponseUserActivityEvent.class.php
index 90ef2474b3..d0151d3b7e 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentResponseUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentResponseUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\article\ViewableArticleList;
 use wcf\data\comment\response\CommentResponseList;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentUserActivityEvent.class.php
index f8cb03efd9..5c223f4607 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/ArticleCommentUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\article\ViewableArticleList;
 use wcf\data\comment\CommentList;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/FollowUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/FollowUserActivityEvent.class.php
index 228ffbaeec..2039075cb9 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/FollowUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/FollowUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\user\UserList;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/IUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/IUserActivityEvent.class.php
index fe04250940..b4e931ebc1 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/IUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/IUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\user\activity\event\ViewableUserActivityEvent;
 
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/LikeableArticleUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/LikeableArticleUserActivityEvent.class.php
index fd0ca50810..fc095ff229 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/LikeableArticleUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/LikeableArticleUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\article\ViewableArticleList;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentResponseUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentResponseUserActivityEvent.class.php
index 45808cfb86..a1339787e3 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentResponseUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentResponseUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\comment\response\CommentResponseList;
 use wcf\data\comment\CommentList;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentUserActivityEvent.class.php
index 31a55237c2..34f95e59ff 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/ProfileCommentUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\comment\CommentList;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/TrophyReceivedUserActivityEvent.class.php b/wcfsetup/install/files/lib/system/user/activity/event/TrophyReceivedUserActivityEvent.class.php
index 5bf88e9119..62d483aad5 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/TrophyReceivedUserActivityEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/TrophyReceivedUserActivityEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\user\trophy\UserTrophyList;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/user/activity/event/UserActivityEventHandler.class.php b/wcfsetup/install/files/lib/system/user/activity/event/UserActivityEventHandler.class.php
index 26e3df08f2..685eb53855 100644
--- a/wcfsetup/install/files/lib/system/user/activity/event/UserActivityEventHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/event/UserActivityEventHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\event;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/activity/point/UserActivityPointHandler.class.php b/wcfsetup/install/files/lib/system/user/activity/point/UserActivityPointHandler.class.php
index 74a19f1238..7a3d38d963 100644
--- a/wcfsetup/install/files/lib/system/user/activity/point/UserActivityPointHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/activity/point/UserActivityPointHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\activity\point;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/authentication/AbstractUserAuthentication.class.php b/wcfsetup/install/files/lib/system/user/authentication/AbstractUserAuthentication.class.php
index b9e1ae13e6..14c5a93571 100644
--- a/wcfsetup/install/files/lib/system/user/authentication/AbstractUserAuthentication.class.php
+++ b/wcfsetup/install/files/lib/system/user/authentication/AbstractUserAuthentication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\authentication;
 use wcf\system\SingletonFactory;
 
diff --git a/wcfsetup/install/files/lib/system/user/authentication/DefaultUserAuthentication.class.php b/wcfsetup/install/files/lib/system/user/authentication/DefaultUserAuthentication.class.php
index 396d0ecc90..39fe55191a 100644
--- a/wcfsetup/install/files/lib/system/user/authentication/DefaultUserAuthentication.class.php
+++ b/wcfsetup/install/files/lib/system/user/authentication/DefaultUserAuthentication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\authentication;
 use wcf\data\user\User;
 use wcf\system\exception\UserInputException;
diff --git a/wcfsetup/install/files/lib/system/user/authentication/EmailUserAuthentication.class.php b/wcfsetup/install/files/lib/system/user/authentication/EmailUserAuthentication.class.php
index 5775d1a3c7..7513e3e66f 100644
--- a/wcfsetup/install/files/lib/system/user/authentication/EmailUserAuthentication.class.php
+++ b/wcfsetup/install/files/lib/system/user/authentication/EmailUserAuthentication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\authentication;
 use wcf\data\user\User;
 
diff --git a/wcfsetup/install/files/lib/system/user/authentication/IUserAuthentication.class.php b/wcfsetup/install/files/lib/system/user/authentication/IUserAuthentication.class.php
index ed3500be7e..f2c3136260 100644
--- a/wcfsetup/install/files/lib/system/user/authentication/IUserAuthentication.class.php
+++ b/wcfsetup/install/files/lib/system/user/authentication/IUserAuthentication.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\authentication;
 use wcf\data\user\User;
 
diff --git a/wcfsetup/install/files/lib/system/user/authentication/UserAuthenticationFactory.class.php b/wcfsetup/install/files/lib/system/user/authentication/UserAuthenticationFactory.class.php
index 7adaa74cf0..bc84472a77 100644
--- a/wcfsetup/install/files/lib/system/user/authentication/UserAuthenticationFactory.class.php
+++ b/wcfsetup/install/files/lib/system/user/authentication/UserAuthenticationFactory.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\authentication;
 use wcf\system\event\EventHandler;
 use wcf\system\exception\ImplementationException;
diff --git a/wcfsetup/install/files/lib/system/user/collapsible/content/UserCollapsibleContentHandler.class.php b/wcfsetup/install/files/lib/system/user/collapsible/content/UserCollapsibleContentHandler.class.php
index 40db7c1c94..f849ad89b5 100644
--- a/wcfsetup/install/files/lib/system/user/collapsible/content/UserCollapsibleContentHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/collapsible/content/UserCollapsibleContentHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\collapsible\content;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/user/group/assignment/UserGroupAssignmentHandler.class.php b/wcfsetup/install/files/lib/system/user/group/assignment/UserGroupAssignmentHandler.class.php
index cce2c0b1d9..ca59a1746c 100644
--- a/wcfsetup/install/files/lib/system/user/group/assignment/UserGroupAssignmentHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/group/assignment/UserGroupAssignmentHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\group\assignment;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/TestableUserNotificationEventHandler.class.php b/wcfsetup/install/files/lib/system/user/notification/TestableUserNotificationEventHandler.class.php
index 89e1254d82..8095760e9d 100644
--- a/wcfsetup/install/files/lib/system/user/notification/TestableUserNotificationEventHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/TestableUserNotificationEventHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification;
 use wcf\data\language\Language;
 use wcf\data\user\notification\event\UserNotificationEvent;
diff --git a/wcfsetup/install/files/lib/system/user/notification/UserNotificationHandler.class.php b/wcfsetup/install/files/lib/system/user/notification/UserNotificationHandler.class.php
index 33ef982651..022a75039e 100644
--- a/wcfsetup/install/files/lib/system/user/notification/UserNotificationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/UserNotificationHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/AbstractSharedUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/AbstractSharedUserNotificationEvent.class.php
index ef9ecfc6e1..dfeca5b624 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/AbstractSharedUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/AbstractSharedUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\notification\UserNotification;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/AbstractUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/AbstractUserNotificationEvent.class.php
index 841faa3eb2..9bc97e2ef4 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/AbstractUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/AbstractUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\language\Language;
 use wcf\data\user\notification\event\UserNotificationEvent;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/ExpiringPaidSubscriptionUserUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/ExpiringPaidSubscriptionUserUserNotificationEvent.class.php
index c6b7855835..0ec014172d 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/ExpiringPaidSubscriptionUserUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/ExpiringPaidSubscriptionUserUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\paid\subscription\user\PaidSubscriptionUser;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserAction;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/ITestableUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/ITestableUserNotificationEvent.class.php
index 118884a7f6..b02acc4115 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/ITestableUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/ITestableUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\language\Language;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/IUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/IUserNotificationEvent.class.php
index a90991c69d..9c23a595cb 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/IUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/IUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\language\Language;
 use wcf\data\user\notification\event\UserNotificationEvent;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentResponseUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentResponseUserNotificationEvent.class.php
index a877dd8140..56bf94b530 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentResponseUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentResponseUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\moderation\queue\ViewableModerationQueue;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentUserNotificationEvent.class.php
index 3f5ffc1d04..6772eb822d 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/ModerationQueueCommentUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\moderation\queue\ViewableModerationQueue;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCategorizedUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCategorizedUserNotificationEvent.class.php
index bb79fc72b6..4431cc2fcf 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCategorizedUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCategorizedUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\category\Category;
 use wcf\data\category\CategoryAction;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentLikeUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentLikeUserNotificationEvent.class.php
index a53768a1bc..bcdf9a1237 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentLikeUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentLikeUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\comment\LikeableComment;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseLikeUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseLikeUserNotificationEvent.class.php
index 5dbdd8351c..7ab9ba9ebf 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseLikeUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseLikeUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\comment\response\LikeableCommentResponse;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseUserNotificationEvent.class.php
index 37cb05237f..5827be94bc 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentResponseUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseAction;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentUserNotificationEvent.class.php
index a3701a0649..b5b113753e 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableCommentUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentAction;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableLikeUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableLikeUserNotificationEvent.class.php
index 1277e84647..b78925da57 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableLikeUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableLikeUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\like\object\ILikeObject;
 use wcf\data\like\Like;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableModerationQueueUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableModerationQueueUserNotificationEvent.class.php
index cb73071742..93e2a20fa5 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableModerationQueueUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableModerationQueueUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\moderation\queue\ModerationQueue;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/TTestableUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/TTestableUserNotificationEvent.class.php
index a85aa7b0c0..12d6e70e06 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/TTestableUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/TTestableUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\system\user\notification\object\IUserNotificationObject;
 
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserFollowFollowingUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserFollowFollowingUserNotificationEvent.class.php
index c56a73218c..70ad1aafa7 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserFollowFollowingUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserFollowFollowingUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\follow\UserFollow;
 use wcf\data\user\follow\UserFollowAction;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentLikeUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentLikeUserNotificationEvent.class.php
index 1e8a37509a..5f0ec6331e 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentLikeUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentLikeUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\UserProfile;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseLikeUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseLikeUserNotificationEvent.class.php
index 97f0af7c06..1d52f36360 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseLikeUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseLikeUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\UserProfile;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseOwnerUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseOwnerUserNotificationEvent.class.php
index 2ae96e53d6..b4f9925a9f 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseOwnerUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseOwnerUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\UserProfile;
 use wcf\system\cache\runtime\CommentRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseUserNotificationEvent.class.php
index e1242eec4d..199bdf7968 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentResponseUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\UserProfile;
 use wcf\system\cache\runtime\CommentRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentUserNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentUserNotificationEvent.class.php
index 6ab9c68cb3..9c9565b3f8 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentUserNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserProfileCommentUserNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\user\UserProfile;
 use wcf\system\cache\runtime\UserProfileRuntimeCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/event/UserTrophyReceivedNotificationEvent.class.php b/wcfsetup/install/files/lib/system/user/notification/event/UserTrophyReceivedNotificationEvent.class.php
index 3e4619a6d5..cf40d4af07 100644
--- a/wcfsetup/install/files/lib/system/user/notification/event/UserTrophyReceivedNotificationEvent.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/event/UserTrophyReceivedNotificationEvent.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\event;
 use wcf\data\trophy\category\TrophyCategory;
 use wcf\data\trophy\category\TrophyCategoryCache;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/CommentResponseUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/CommentResponseUserNotificationObject.class.php
index 44c199ab58..ba76beb2ef 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/CommentResponseUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/CommentResponseUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/CommentUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/CommentUserNotificationObject.class.php
index 79c0858861..ce10e0ee00 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/CommentUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/CommentUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\comment\Comment;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/IStackableUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/IStackableUserNotificationObject.class.php
index f363c6b67d..eb236d3719 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/IStackableUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/IStackableUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/IUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/IUserNotificationObject.class.php
index ff5d890c1a..203b0fc889 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/IUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/IUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\IDatabaseObjectProcessor;
 use wcf\data\ITitledObject;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/LikeUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/LikeUserNotificationObject.class.php
index ded8590159..a551c9d48d 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/LikeUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/LikeUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\like\Like;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/PaidSubscriptionUserUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/PaidSubscriptionUserUserNotificationObject.class.php
index b9c3807815..70b4ab54c3 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/PaidSubscriptionUserUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/PaidSubscriptionUserUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\paid\subscription\user\PaidSubscriptionUser;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/UserFollowUserNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/UserFollowUserNotificationObject.class.php
index 5e8b7bb769..e890e84eb7 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/UserFollowUserNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/UserFollowUserNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\user\follow\UserFollow;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/UserTrophyNotificationObject.class.php b/wcfsetup/install/files/lib/system/user/notification/object/UserTrophyNotificationObject.class.php
index 3e870f0039..b08e8e3e29 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/UserTrophyNotificationObject.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/UserTrophyNotificationObject.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object;
 use wcf\data\user\trophy\UserTrophy;
 use wcf\data\DatabaseObjectDecorator;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/AbstractUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/AbstractUserNotificationObjectType.class.php
index 63f465c8f7..3e8509ba09 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/AbstractUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/AbstractUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\object\type\AbstractObjectTypeProcessor;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/ICommentUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/ICommentUserNotificationObjectType.class.php
index 237c00a7c3..9360511531 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/ICommentUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/ICommentUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/IMultiRecipientCommentUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/IMultiRecipientCommentUserNotificationObjectType.class.php
index e725da26df..b3966999ac 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/IMultiRecipientCommentUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/IMultiRecipientCommentUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\comment\Comment;
 
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/IUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/IUserNotificationObjectType.class.php
index 9637b359bb..4a9e748b4f 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/IUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/IUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\IDatabaseObjectProcessor;
 use wcf\system\user\notification\object\IUserNotificationObject;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/LikeUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/LikeUserNotificationObjectType.class.php
index 196ebdabdb..49e8b4ad32 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/LikeUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/LikeUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\like\Like;
 use wcf\data\like\LikeList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentResponseUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentResponseUserNotificationObjectType.class.php
index e8bcfa9565..a2bffb505c 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentResponseUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentResponseUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentUserNotificationObjectType.class.php
index ea1754d237..bc1e0327af 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/ModerationQueueCommentUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/PaidSubscriptionUserUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/PaidSubscriptionUserUserNotificationObjectType.class.php
index 46276d9b33..37f9e767fd 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/PaidSubscriptionUserUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/PaidSubscriptionUserUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\paid\subscription\user\PaidSubscriptionUser;
 use wcf\data\paid\subscription\user\PaidSubscriptionUserList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/TMultiRecipientModerationQueueCommentUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/TMultiRecipientModerationQueueCommentUserNotificationObjectType.class.php
index 7b07d8a73e..0ae07ae19a 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/TMultiRecipientModerationQueueCommentUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/TMultiRecipientModerationQueueCommentUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\comment\Comment;
 use wcf\data\user\UserProfile;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/UserFollowUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/UserFollowUserNotificationObjectType.class.php
index f624b0ca8d..00de2db599 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/UserFollowUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/UserFollowUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\user\follow\UserFollow;
 use wcf\data\user\follow\UserFollowList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentResponseUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentResponseUserNotificationObjectType.class.php
index 44411838ee..b024d818a7 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentResponseUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentResponseUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentUserNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentUserNotificationObjectType.class.php
index e2bc2799b5..88abe10ac8 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentUserNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/UserProfileCommentUserNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentList;
diff --git a/wcfsetup/install/files/lib/system/user/notification/object/type/UserTrophyNotificationObjectType.class.php b/wcfsetup/install/files/lib/system/user/notification/object/type/UserTrophyNotificationObjectType.class.php
index 9bc4feebe9..0a2dc1709a 100644
--- a/wcfsetup/install/files/lib/system/user/notification/object/type/UserTrophyNotificationObjectType.class.php
+++ b/wcfsetup/install/files/lib/system/user/notification/object/type/UserTrophyNotificationObjectType.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\notification\object\type;
 use wcf\data\user\trophy\UserTrophy;
 use wcf\data\user\trophy\UserTrophyList;
diff --git a/wcfsetup/install/files/lib/system/user/object/watch/IUserObjectWatch.class.php b/wcfsetup/install/files/lib/system/user/object/watch/IUserObjectWatch.class.php
index 90a888cd3a..1e9bfacbf2 100644
--- a/wcfsetup/install/files/lib/system/user/object/watch/IUserObjectWatch.class.php
+++ b/wcfsetup/install/files/lib/system/user/object/watch/IUserObjectWatch.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\object\watch;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/user/object/watch/UserObjectWatchHandler.class.php b/wcfsetup/install/files/lib/system/user/object/watch/UserObjectWatchHandler.class.php
index 95e17d1155..413404bafb 100644
--- a/wcfsetup/install/files/lib/system/user/object/watch/UserObjectWatchHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/object/watch/UserObjectWatchHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\object\watch;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/user/online/location/IUserOnlineLocation.class.php b/wcfsetup/install/files/lib/system/user/online/location/IUserOnlineLocation.class.php
index 87c750d3b5..3894e630ff 100644
--- a/wcfsetup/install/files/lib/system/user/online/location/IUserOnlineLocation.class.php
+++ b/wcfsetup/install/files/lib/system/user/online/location/IUserOnlineLocation.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\online\location;
 use wcf\data\user\online\UserOnline;
 
diff --git a/wcfsetup/install/files/lib/system/user/online/location/UserOnlineLocationHandler.class.php b/wcfsetup/install/files/lib/system/user/online/location/UserOnlineLocationHandler.class.php
index f80affcc3c..3067cd6d4e 100644
--- a/wcfsetup/install/files/lib/system/user/online/location/UserOnlineLocationHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/online/location/UserOnlineLocationHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\online\location;
 use wcf\data\user\online\UserOnline;
 use wcf\system\SingletonFactory;
diff --git a/wcfsetup/install/files/lib/system/user/signature/SignatureCache.class.php b/wcfsetup/install/files/lib/system/user/signature/SignatureCache.class.php
index 4f78e14498..bed510ad72 100644
--- a/wcfsetup/install/files/lib/system/user/signature/SignatureCache.class.php
+++ b/wcfsetup/install/files/lib/system/user/signature/SignatureCache.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\signature;
 use wcf\data\user\User;
 use wcf\system\html\output\HtmlOutputProcessor;
diff --git a/wcfsetup/install/files/lib/system/user/storage/UserStorageHandler.class.php b/wcfsetup/install/files/lib/system/user/storage/UserStorageHandler.class.php
index 4483bc5a50..c7c9451b95 100644
--- a/wcfsetup/install/files/lib/system/user/storage/UserStorageHandler.class.php
+++ b/wcfsetup/install/files/lib/system/user/storage/UserStorageHandler.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\user\storage;
 use wcf\system\cache\source\RedisCacheSource;
 use wcf\system\cache\CacheHandler;
diff --git a/wcfsetup/install/files/lib/system/version/AbstractVersionTrackerProvider.class.php b/wcfsetup/install/files/lib/system/version/AbstractVersionTrackerProvider.class.php
index fd0262ccd0..d22cbf818e 100644
--- a/wcfsetup/install/files/lib/system/version/AbstractVersionTrackerProvider.class.php
+++ b/wcfsetup/install/files/lib/system/version/AbstractVersionTrackerProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 use wcf\data\object\type\AbstractObjectTypeProvider;
 use wcf\data\IVersionTrackerObject;
diff --git a/wcfsetup/install/files/lib/system/version/ArticleVersionTrackerProvider.class.php b/wcfsetup/install/files/lib/system/version/ArticleVersionTrackerProvider.class.php
index b168e839dc..100de62b31 100644
--- a/wcfsetup/install/files/lib/system/version/ArticleVersionTrackerProvider.class.php
+++ b/wcfsetup/install/files/lib/system/version/ArticleVersionTrackerProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 use wcf\data\article\Article;
 use wcf\data\article\ArticleAction;
diff --git a/wcfsetup/install/files/lib/system/version/BoxVersionTrackerProvider.class.php b/wcfsetup/install/files/lib/system/version/BoxVersionTrackerProvider.class.php
index 13827e9cce..34add421fc 100644
--- a/wcfsetup/install/files/lib/system/version/BoxVersionTrackerProvider.class.php
+++ b/wcfsetup/install/files/lib/system/version/BoxVersionTrackerProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 use wcf\data\box\Box;
 use wcf\data\box\BoxAction;
diff --git a/wcfsetup/install/files/lib/system/version/IVersionTrackerProvider.class.php b/wcfsetup/install/files/lib/system/version/IVersionTrackerProvider.class.php
index cfcfbdafbb..df3a1d08d0 100644
--- a/wcfsetup/install/files/lib/system/version/IVersionTrackerProvider.class.php
+++ b/wcfsetup/install/files/lib/system/version/IVersionTrackerProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 use wcf\data\object\type\IObjectTypeProvider;
 use wcf\data\IVersionTrackerObject;
diff --git a/wcfsetup/install/files/lib/system/version/PageVersionTrackerProvider.class.php b/wcfsetup/install/files/lib/system/version/PageVersionTrackerProvider.class.php
index 8c6a5cae7d..359699d274 100644
--- a/wcfsetup/install/files/lib/system/version/PageVersionTrackerProvider.class.php
+++ b/wcfsetup/install/files/lib/system/version/PageVersionTrackerProvider.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 use wcf\data\page\Page;
 use wcf\data\page\PageAction;
diff --git a/wcfsetup/install/files/lib/system/version/VersionTracker.class.php b/wcfsetup/install/files/lib/system/version/VersionTracker.class.php
index 126a861145..d22c27ef62 100644
--- a/wcfsetup/install/files/lib/system/version/VersionTracker.class.php
+++ b/wcfsetup/install/files/lib/system/version/VersionTracker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/version/VersionTrackerEntry.class.php b/wcfsetup/install/files/lib/system/version/VersionTrackerEntry.class.php
index 401993569c..73c75f2ef3 100644
--- a/wcfsetup/install/files/lib/system/version/VersionTrackerEntry.class.php
+++ b/wcfsetup/install/files/lib/system/version/VersionTrackerEntry.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\version;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/visitTracker/VisitTracker.class.php b/wcfsetup/install/files/lib/system/visitTracker/VisitTracker.class.php
index 06bfd90976..f5025683c3 100644
--- a/wcfsetup/install/files/lib/system/visitTracker/VisitTracker.class.php
+++ b/wcfsetup/install/files/lib/system/visitTracker/VisitTracker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\visitTracker;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/worker/AbstractRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/AbstractRebuildDataWorker.class.php
index f20619da0d..f8e97f6a8e 100644
--- a/wcfsetup/install/files/lib/system/worker/AbstractRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/AbstractRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\user\group\UserGroup;
 use wcf\data\DatabaseObjectList;
diff --git a/wcfsetup/install/files/lib/system/worker/AbstractWorker.class.php b/wcfsetup/install/files/lib/system/worker/AbstractWorker.class.php
index e44973dd4c..113adb3231 100644
--- a/wcfsetup/install/files/lib/system/worker/AbstractWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/AbstractWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/worker/ArticleRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/ArticleRebuildDataWorker.class.php
index 1ff5749acf..d484f95c62 100644
--- a/wcfsetup/install/files/lib/system/worker/ArticleRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/ArticleRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\article\content\ArticleContentEditor;
 use wcf\data\article\content\ArticleContentList;
diff --git a/wcfsetup/install/files/lib/system/worker/AttachmentRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/AttachmentRebuildDataWorker.class.php
index c8dcec0312..0951b36270 100644
--- a/wcfsetup/install/files/lib/system/worker/AttachmentRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/AttachmentRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\attachment\AttachmentAction;
 use wcf\data\attachment\AttachmentList;
diff --git a/wcfsetup/install/files/lib/system/worker/CommentRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/CommentRebuildDataWorker.class.php
index 9e095ec362..83d64e0ca8 100644
--- a/wcfsetup/install/files/lib/system/worker/CommentRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/CommentRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\comment\Comment;
 use wcf\data\comment\CommentEditor;
diff --git a/wcfsetup/install/files/lib/system/worker/CommentResponseRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/CommentResponseRebuildDataWorker.class.php
index 396342ad0d..d74bb7eaac 100644
--- a/wcfsetup/install/files/lib/system/worker/CommentResponseRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/CommentResponseRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\comment\response\CommentResponse;
 use wcf\data\comment\response\CommentResponseEditor;
diff --git a/wcfsetup/install/files/lib/system/worker/DatabaseConvertEncodingWorker.class.php b/wcfsetup/install/files/lib/system/worker/DatabaseConvertEncodingWorker.class.php
index cfeb62001f..5a303a50d2 100644
--- a/wcfsetup/install/files/lib/system/worker/DatabaseConvertEncodingWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/DatabaseConvertEncodingWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\system\request\LinkHandler;
 use wcf\system\WCF;
diff --git a/wcfsetup/install/files/lib/system/worker/IRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/IRebuildDataWorker.class.php
index 93e787e94d..2160b1cceb 100644
--- a/wcfsetup/install/files/lib/system/worker/IRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/IRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/worker/IWorker.class.php b/wcfsetup/install/files/lib/system/worker/IWorker.class.php
index a47a647644..07adb53f15 100644
--- a/wcfsetup/install/files/lib/system/worker/IWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/IWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 
 /**
diff --git a/wcfsetup/install/files/lib/system/worker/ImportWorker.class.php b/wcfsetup/install/files/lib/system/worker/ImportWorker.class.php
index 774827034b..5b9c5ab100 100644
--- a/wcfsetup/install/files/lib/system/worker/ImportWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/ImportWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\exception\SystemException;
diff --git a/wcfsetup/install/files/lib/system/worker/LikeRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/LikeRebuildDataWorker.class.php
index b8412df67e..b0e564f65f 100644
--- a/wcfsetup/install/files/lib/system/worker/LikeRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/LikeRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\like\Like;
 use wcf\data\like\LikeList;
diff --git a/wcfsetup/install/files/lib/system/worker/LikeUserRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/LikeUserRebuildDataWorker.class.php
index 870f466743..6a74233263 100644
--- a/wcfsetup/install/files/lib/system/worker/LikeUserRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/LikeUserRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\like\object\LikeObjectList;
 use wcf\data\like\Like;
diff --git a/wcfsetup/install/files/lib/system/worker/MailWorker.class.php b/wcfsetup/install/files/lib/system/worker/MailWorker.class.php
index 3bfe73ed01..a7d185b04c 100644
--- a/wcfsetup/install/files/lib/system/worker/MailWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/MailWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\user\User;
 use wcf\system\background\BackgroundQueueHandler;
diff --git a/wcfsetup/install/files/lib/system/worker/MediaRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/MediaRebuildDataWorker.class.php
index 54d2c7a75b..b5d4d73f0d 100644
--- a/wcfsetup/install/files/lib/system/worker/MediaRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/MediaRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\media\MediaAction;
 use wcf\data\media\MediaList;
diff --git a/wcfsetup/install/files/lib/system/worker/PageRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/PageRebuildDataWorker.class.php
index d9670c7f89..fe52c5ef4a 100644
--- a/wcfsetup/install/files/lib/system/worker/PageRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/PageRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\page\content\PageContentEditor;
 use wcf\data\page\content\PageContentList;
diff --git a/wcfsetup/install/files/lib/system/worker/PollRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/PollRebuildDataWorker.class.php
index 03e3361e44..51ee936e6f 100644
--- a/wcfsetup/install/files/lib/system/worker/PollRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/PollRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\poll\PollList;
 use wcf\system\database\util\PreparedStatementConditionBuilder;
diff --git a/wcfsetup/install/files/lib/system/worker/SendNewPasswordWorker.class.php b/wcfsetup/install/files/lib/system/worker/SendNewPasswordWorker.class.php
index d836467452..4d92652283 100644
--- a/wcfsetup/install/files/lib/system/worker/SendNewPasswordWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/SendNewPasswordWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\user\User;
 use wcf\data\user\UserAction;
diff --git a/wcfsetup/install/files/lib/system/worker/SitemapRebuildWorker.class.php b/wcfsetup/install/files/lib/system/worker/SitemapRebuildWorker.class.php
index 0421e479a6..b191e299a5 100755
--- a/wcfsetup/install/files/lib/system/worker/SitemapRebuildWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/SitemapRebuildWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/worker/StatDailyRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/StatDailyRebuildDataWorker.class.php
index 81e0802b8e..82fc6c8d6a 100644
--- a/wcfsetup/install/files/lib/system/worker/StatDailyRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/StatDailyRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\object\type\ObjectTypeCache;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/system/worker/UserActivityPointUpdateEventsWorker.class.php b/wcfsetup/install/files/lib/system/worker/UserActivityPointUpdateEventsWorker.class.php
index 007f4f3079..e6676631eb 100644
--- a/wcfsetup/install/files/lib/system/worker/UserActivityPointUpdateEventsWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/UserActivityPointUpdateEventsWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\object\type\ObjectType;
 use wcf\data\object\type\ObjectTypeCache;
diff --git a/wcfsetup/install/files/lib/system/worker/UserRebuildDataWorker.class.php b/wcfsetup/install/files/lib/system/worker/UserRebuildDataWorker.class.php
index 9ef2855ebb..4fae5abfbc 100644
--- a/wcfsetup/install/files/lib/system/worker/UserRebuildDataWorker.class.php
+++ b/wcfsetup/install/files/lib/system/worker/UserRebuildDataWorker.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\system\worker;
 use wcf\data\like\Like;
 use wcf\data\user\avatar\UserAvatar;
diff --git a/wcfsetup/install/files/lib/util/ArrayUtil.class.php b/wcfsetup/install/files/lib/util/ArrayUtil.class.php
index 1c10956c9d..d909b45bb8 100644
--- a/wcfsetup/install/files/lib/util/ArrayUtil.class.php
+++ b/wcfsetup/install/files/lib/util/ArrayUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/CLIUtil.class.php b/wcfsetup/install/files/lib/util/CLIUtil.class.php
index 3f5bea3502..5bb1f1ce56 100644
--- a/wcfsetup/install/files/lib/util/CLIUtil.class.php
+++ b/wcfsetup/install/files/lib/util/CLIUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use phpline\internal\AnsiUtil;
 use wcf\system\CLIWCF;
diff --git a/wcfsetup/install/files/lib/util/ClassUtil.class.php b/wcfsetup/install/files/lib/util/ClassUtil.class.php
index 5fc17ec863..52db898c6a 100644
--- a/wcfsetup/install/files/lib/util/ClassUtil.class.php
+++ b/wcfsetup/install/files/lib/util/ClassUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/CronjobUtil.class.php b/wcfsetup/install/files/lib/util/CronjobUtil.class.php
index b23c042b5a..c640a6b49f 100644
--- a/wcfsetup/install/files/lib/util/CronjobUtil.class.php
+++ b/wcfsetup/install/files/lib/util/CronjobUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/CryptoUtil.class.php b/wcfsetup/install/files/lib/util/CryptoUtil.class.php
index 625825aabc..b2f74bdae4 100644
--- a/wcfsetup/install/files/lib/util/CryptoUtil.class.php
+++ b/wcfsetup/install/files/lib/util/CryptoUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\util\exception\CryptoException;
 
diff --git a/wcfsetup/install/files/lib/util/DOMUtil.class.php b/wcfsetup/install/files/lib/util/DOMUtil.class.php
index 172f625bcb..50bcc16d17 100644
--- a/wcfsetup/install/files/lib/util/DOMUtil.class.php
+++ b/wcfsetup/install/files/lib/util/DOMUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/DateUtil.class.php b/wcfsetup/install/files/lib/util/DateUtil.class.php
index af4b2cd797..162edf4c0e 100644
--- a/wcfsetup/install/files/lib/util/DateUtil.class.php
+++ b/wcfsetup/install/files/lib/util/DateUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\data\language\Language;
 use wcf\data\user\User;
diff --git a/wcfsetup/install/files/lib/util/Diff.class.php b/wcfsetup/install/files/lib/util/Diff.class.php
index 3bd583e7cd..b387a637c6 100644
--- a/wcfsetup/install/files/lib/util/Diff.class.php
+++ b/wcfsetup/install/files/lib/util/Diff.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/DirectoryUtil.class.php b/wcfsetup/install/files/lib/util/DirectoryUtil.class.php
index 7364c316e7..080b8985dd 100644
--- a/wcfsetup/install/files/lib/util/DirectoryUtil.class.php
+++ b/wcfsetup/install/files/lib/util/DirectoryUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 use wcf\system\Regex;
diff --git a/wcfsetup/install/files/lib/util/ExifUtil.class.php b/wcfsetup/install/files/lib/util/ExifUtil.class.php
index dbf664e783..0a223c9d0a 100644
--- a/wcfsetup/install/files/lib/util/ExifUtil.class.php
+++ b/wcfsetup/install/files/lib/util/ExifUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/FileReader.class.php b/wcfsetup/install/files/lib/util/FileReader.class.php
index a15623cee2..4ae253ebe9 100644
--- a/wcfsetup/install/files/lib/util/FileReader.class.php
+++ b/wcfsetup/install/files/lib/util/FileReader.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 use wcf\system\io\File;
diff --git a/wcfsetup/install/files/lib/util/FileUtil.class.php b/wcfsetup/install/files/lib/util/FileUtil.class.php
index 051a6d1d23..eb6263409c 100644
--- a/wcfsetup/install/files/lib/util/FileUtil.class.php
+++ b/wcfsetup/install/files/lib/util/FileUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 use wcf\system\io\File;
diff --git a/wcfsetup/install/files/lib/util/HTTPRequest.class.php b/wcfsetup/install/files/lib/util/HTTPRequest.class.php
index b37c1a822e..58bca3ddd3 100644
--- a/wcfsetup/install/files/lib/util/HTTPRequest.class.php
+++ b/wcfsetup/install/files/lib/util/HTTPRequest.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\HTTPNotFoundException;
 use wcf\system\exception\HTTPServerErrorException;
diff --git a/wcfsetup/install/files/lib/util/HeaderUtil.class.php b/wcfsetup/install/files/lib/util/HeaderUtil.class.php
index 9469f103f3..fa017985e8 100644
--- a/wcfsetup/install/files/lib/util/HeaderUtil.class.php
+++ b/wcfsetup/install/files/lib/util/HeaderUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\event\EventHandler;
diff --git a/wcfsetup/install/files/lib/util/ImageUtil.class.php b/wcfsetup/install/files/lib/util/ImageUtil.class.php
index f2af48ee81..5142cce452 100644
--- a/wcfsetup/install/files/lib/util/ImageUtil.class.php
+++ b/wcfsetup/install/files/lib/util/ImageUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/JSON.class.php b/wcfsetup/install/files/lib/util/JSON.class.php
index 9f6af0ec0c..543dc7e31c 100644
--- a/wcfsetup/install/files/lib/util/JSON.class.php
+++ b/wcfsetup/install/files/lib/util/JSON.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/MathUtil.class.php b/wcfsetup/install/files/lib/util/MathUtil.class.php
index 494b26c438..dbd64b8546 100644
--- a/wcfsetup/install/files/lib/util/MathUtil.class.php
+++ b/wcfsetup/install/files/lib/util/MathUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/MessageUtil.class.php b/wcfsetup/install/files/lib/util/MessageUtil.class.php
index 605eaa7cd6..838de1aa40 100644
--- a/wcfsetup/install/files/lib/util/MessageUtil.class.php
+++ b/wcfsetup/install/files/lib/util/MessageUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\html\input\HtmlInputProcessor;
 use wcf\system\Regex;
diff --git a/wcfsetup/install/files/lib/util/OptionUtil.class.php b/wcfsetup/install/files/lib/util/OptionUtil.class.php
index 199961fc4f..2c3a7b80ad 100644
--- a/wcfsetup/install/files/lib/util/OptionUtil.class.php
+++ b/wcfsetup/install/files/lib/util/OptionUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/PasswordUtil.class.php b/wcfsetup/install/files/lib/util/PasswordUtil.class.php
index 82dd79e524..1b0c6c62e5 100644
--- a/wcfsetup/install/files/lib/util/PasswordUtil.class.php
+++ b/wcfsetup/install/files/lib/util/PasswordUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 use wcf\system\Regex;
diff --git a/wcfsetup/install/files/lib/util/StringStack.class.php b/wcfsetup/install/files/lib/util/StringStack.class.php
index 80f910afef..ed43faff4d 100644
--- a/wcfsetup/install/files/lib/util/StringStack.class.php
+++ b/wcfsetup/install/files/lib/util/StringStack.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/StringUtil.class.php b/wcfsetup/install/files/lib/util/StringUtil.class.php
index 6f136afb81..4011f8f47f 100644
--- a/wcfsetup/install/files/lib/util/StringUtil.class.php
+++ b/wcfsetup/install/files/lib/util/StringUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\application\ApplicationHandler;
 use wcf\system\request\RouteHandler;
diff --git a/wcfsetup/install/files/lib/util/StyleUtil.class.php b/wcfsetup/install/files/lib/util/StyleUtil.class.php
index e4648221c3..5d333c65f0 100644
--- a/wcfsetup/install/files/lib/util/StyleUtil.class.php
+++ b/wcfsetup/install/files/lib/util/StyleUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\style\StyleCompiler;
 
diff --git a/wcfsetup/install/files/lib/util/Url.class.php b/wcfsetup/install/files/lib/util/Url.class.php
index b312c3b7de..5ab7325899 100644
--- a/wcfsetup/install/files/lib/util/Url.class.php
+++ b/wcfsetup/install/files/lib/util/Url.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/UserRegistrationUtil.class.php b/wcfsetup/install/files/lib/util/UserRegistrationUtil.class.php
index 9ad8754c0c..ecb06a5bbd 100644
--- a/wcfsetup/install/files/lib/util/UserRegistrationUtil.class.php
+++ b/wcfsetup/install/files/lib/util/UserRegistrationUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/UserUtil.class.php b/wcfsetup/install/files/lib/util/UserUtil.class.php
index 7301153532..94402891e7 100644
--- a/wcfsetup/install/files/lib/util/UserUtil.class.php
+++ b/wcfsetup/install/files/lib/util/UserUtil.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\WCF;
 
diff --git a/wcfsetup/install/files/lib/util/XML.class.php b/wcfsetup/install/files/lib/util/XML.class.php
index 85b62355d6..93af4ed5d1 100644
--- a/wcfsetup/install/files/lib/util/XML.class.php
+++ b/wcfsetup/install/files/lib/util/XML.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/XMLWriter.class.php b/wcfsetup/install/files/lib/util/XMLWriter.class.php
index 77eba26235..ab7fff3816 100644
--- a/wcfsetup/install/files/lib/util/XMLWriter.class.php
+++ b/wcfsetup/install/files/lib/util/XMLWriter.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util;
 use wcf\system\exception\SystemException;
 
diff --git a/wcfsetup/install/files/lib/util/exception/CryptoException.class.php b/wcfsetup/install/files/lib/util/exception/CryptoException.class.php
index 4650b4b03a..0aa2286e7a 100644
--- a/wcfsetup/install/files/lib/util/exception/CryptoException.class.php
+++ b/wcfsetup/install/files/lib/util/exception/CryptoException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util\exception;
 
 /**
diff --git a/wcfsetup/install/files/lib/util/exception/HTTPException.class.php b/wcfsetup/install/files/lib/util/exception/HTTPException.class.php
index de475fdea0..053b5a7cfc 100644
--- a/wcfsetup/install/files/lib/util/exception/HTTPException.class.php
+++ b/wcfsetup/install/files/lib/util/exception/HTTPException.class.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 namespace wcf\util\exception;
 use wcf\system\exception\IExtraInformationException;
 use wcf\system\exception\SystemException;