使用nav_menu_item_id在Wordpress菜单中编辑特定元素

I want to add number of items in wishlist next to li element in my "menu_main". To problem is I can't how to edit that specific element. I tried sth like

add_filter( 'nav_menu_item_id', 'filter_function_name_5519', 10, 3 );
function filter_function_name_5519( $menu_id, $item, $args ){
    // filter...
    if (!is_admin() && $args->theme_location == 'menu_main' && 
yith_wcwl_count_products() && $menu_id == 'menu-item-5519') {
        $item .= '<li>' . yith_wcwl_count_products() . '</li>';
    }
    return $item;
}

But that doesn't work. Important for me is to echo yith_wcwl_count_products() within li element, because I need to position it with css via position relative and absolute.

you can't change this way you are dealing with an object here so if you want to change the title you can do it this way:

 add_filter('nav_menu_item_id', 'filter_function_name_5519', 10, 3);
function filter_function_name_5519($menu_id, $item, $args)
{
    if (!is_admin() && $menu_id == 'menu-item-42') {
        $item->title .= ' test ';

    }


}