In `kses.php`, ensure that `$allowedposttags`, `$allowedtags`, and `$allowedentitynames` are added to the global namespace.

Props Jaza613.
Fixes #28582.


Built from https://develop.svn.wordpress.org/trunk@28845


git-svn-id: http://core.svn.wordpress.org/trunk@28649 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/kses.php

@@ -44,6 +44,10 @@
 if ( ! defined( 'CUSTOM_TAGS' ) )
 	define( 'CUSTOM_TAGS', false );
 
+// Ensure that these variables are added to the global namespace
+// (e.g. if using namespaces / autoload in the current PHP environment).
+global $allowedposttags, $allowedtags, $allowedentitynames;
+
 if ( ! CUSTOM_TAGS ) {
 	/**
 	 * Kses global for default allowable HTML tags.