Ticket #17754: 17754.diff

wp-includes/functions.php

@@ -2129 +2129 @@
                 return true;
 
         // a path starting with / or \ is absolute; anything else is relative
-        return (bool) preg_match('#^[/\\\\]#', $path);
+        return ( $path{0} == '/' || $path{0} == '\\' );
 }
 
 /**