From 32baee20f58f716f9304fd10994e1b80ef27c837 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Tim=20D=C3=BCsterhus?= <timwolla@arcor.de>
Date: Mon, 7 Nov 2011 14:18:03 +0100
Subject: [PATCH] Disabled serializing of Singletons

$a = Test::getInstance();
$b = Test::getInstance();
echo 'A: '.$a->foo."\n"; // A: bar
echo 'B: '.$b->foo."\n"; // B: bar
$a->foo = 'a';
echo 'A: '.$a->foo."\n"; // A: a
echo 'B: '.$b->foo."\n"; // B: a
$b = unserialize(serialize($b)); // -> With this change SystemException
$a->foo = 'b';
echo 'A: '.$a->foo."\n"; // A: b
echo 'B: '.$b->foo."\n"; // B: a
---
 .../install/files/lib/system/SingletonFactory.class.php  | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/wcfsetup/install/files/lib/system/SingletonFactory.class.php b/wcfsetup/install/files/lib/system/SingletonFactory.class.php
index e182f7106e..337fd44884 100644
--- a/wcfsetup/install/files/lib/system/SingletonFactory.class.php
+++ b/wcfsetup/install/files/lib/system/SingletonFactory.class.php
@@ -1,5 +1,6 @@
 <?php
 namespace wcf\system;
+use wcf\system\exception\SystemException;
 
 /**
  * Basis class for singleton classes.
@@ -36,6 +37,14 @@ abstract class SingletonFactory {
 	 */
 	protected final function __clone() { }
 	
+	/**
+	 * Object serializing is disallowed.
+	 */
+	public final function __sleep() {
+		throw new SystemException('Serializing of Singletons is not allowed');
+		// Turret: I'm different
+	}
+	
 	/**
 	 * Returns an unique instance of current child class.
 	 * 
-- 
2.20.1