قراردادن محصولات ناموجود در انتهای لیست

add_filter('posts_clauses', 'custom_move_contact_price_to_end', 9999);
function custom_move_contact_price_to_end($posts_clauses)
{
    global $wpdb;

    // Apply changes only on WooCommerce loops
    if (is_woocommerce() && (is_shop() || is_product_category() || is_product_tag() || is_product_taxonomy()))
    {
        // Join to postmeta table for price meta key
        $posts_clauses['join'] .= " LEFT JOIN $wpdb->postmeta price_meta ON ($wpdb->posts.ID = price_meta.post_id AND price_meta.meta_key = '_price') ";

        // Order by CASE condition to move "Contact" price products to the end
        $posts_clauses['orderby'] = " CASE WHEN price_meta.meta_value IS NULL OR price_meta.meta_value = '' OR price_meta.meta_value = 'تماس' THEN 1 ELSE 0 END ASC, " . $posts_clauses['orderby'];
    }

    return $posts_clauses;
}