Add `is_string` as template modifier

Resolves #5388

diff --git a/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php b/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php
index c98341e3f60a31322bf32d7bdeba66c6941025a3..c315891f15a53ee21d596b7fd2b0c3539f18133c 100644 (file)
--- a/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php
+++ b/wcfsetup/install/files/lib/system/template/TemplateScriptingCompiler.class.php
@@ -97,6 +97,7 @@ class TemplateScriptingCompiler
         'is_null',
         'is_numeric',
         'is_object',
+        'is_string',
         'iterator_count',
         'intval',
         'is_subclass_of',