Clean WordPress Menu's classes

functions.php

//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
                'current_page_item',
                'current_page_parent',
                'current_page_ancestor',
                'first',
                'last',
                'vertical',
                'horizontal'
                )
        ) : '';
}
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" (Bootstrap navigation working well)
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 (optional)
function strip_empty_classes($menu) {
    $menu = preg_replace('/ class=""| class="sub-menu"/','',$menu);
    return $menu;
}
add_filter ('wp_nav_menu','strip_empty_classes');