Adding test to verify that __sleep can handle parent classes' private…

… members

tests/classes/private_members_serialization.phpt

@@ -0,0 +1,23 @@
+--TEST--
+Verifies that it is possible to return private member names of parent classes in __sleep
+--FILE--
+<?php
+class foo
+{
+	private $private = 'private';
+	protected $protected = 'protected';
+	public $public = 'public';
+}
+
+class bar extends foo
+{
+	public function __sleep()
+	{
+		return array("\0foo\0private", 'protected', 'public');
+	}
+}
+
+var_dump(str_replace("\0", '\0', serialize(new bar())));
+?>
+--EXPECTF--
+string(114) "O:3:"bar":3:{s:12:"\0foo\0private";s:7:"private";s:12:"\0*\0protected";s:9:"protected";s:6:"public";s:6:"public";}"