Обрабатывать неверные URL ЧПУ

//решение проблемы с категориями, редирект на верный урл, удаление # и id
            if( $config['allow_alt_url'] == "yes" AND $category_id AND $view_template != "rss") {
 
                $re_cat = get_url( $category_id );
 
                if ($re_cat != $_GET['category'] OR substr ( $_SERVER['REQUEST_URI'], - 1, 1 ) == '/' ) {
                    $re_url = explode ( "index.php", strtolower ( $_SERVER['PHP_SELF'] ) );
                    $re_url = reset ( $re_url );
 
                    header("HTTP/1.0 301 Moved Permanently");
                    header("Location: {$re_url}{$re_cat}");
                    die("Redirect");
                }
            }