Hi All I`m new on this forum.
I using: Joomla v 1.5.13
ARTIO JoomSEFv3.3.5 free
php 5
host: 
superhost.pl/
The problem is with my page 
www.cyeweb.pl. The first page is correct but when you click another link You will see error: Fatal error: Call to undefined function: array_diff_key() in /users/amb/www/cyeweb.pl/components/com_sef/joomsef.php on line 616 
In file joomsef.php is :
 if (!empty($newVars) && !empty($vars)) {
            // If this was SEF url, consider the vars in query as nonsef
  616:          $nonsef = array_diff_key($vars, $newVars);
            if (!empty($nonsef)) {
                $mainframe->set('sef.global.nonsefvars', $nonsef);
            }
        }
I have read that is a problem with php 4 , but I useing PhP5 :(
Please help me what I did wrong!