Sometime we are needed to modify the default “sub-menu” class for the child menu in wordpress. There is no direct way you can do that but this can be done by placing a sample code in your functions.php like below:
function change_submenu_class($menu) { $menu = preg_replace('/ class="sub-menu"/','/ class="submenu" /',$menu); return $menu; } add_filter('wp_nav_menu','change_submenu_class');