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Clean up WordPress wp_nav_menu
//Deletes all CSS classes and id's, except for those listed in the array below
function custom_wp_nav_menu($var) {
return is_array($var) ? array_intersect($var, array(
//List of allowed menu classes
) : '';
add_filter('nav_menu_css_class', 'custom_wp_nav_menu');
add_filter('nav_menu_item_id', 'custom_wp_nav_menu');
add_filter('page_css_class', 'custom_wp_nav_menu');
//Replaces "current-menu-item" with "active"
function current_to_active($text){
$replace = array(
//List of menu item classes that should be changed to "active"
'current_page_item' => 'active',
'current_page_parent' => 'active',
'current_page_ancestor' => 'active',
$text = str_replace(array_keys($replace), $replace, $text);
return $text;
add_filter ('wp_nav_menu','current_to_active');
//Deletes empty classes and removes the sub menu class
function strip_empty_classes($menu) {
$menu = preg_replace('/ class=""| class="sub-menu"/','',$menu);
return $menu;
add_filter ('wp_nav_menu','strip_empty_classes');
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