Сделал так, но не получилось
public static function getNewProducts($id_lang, $page_number = 0, $nb_products = 10, , $id_category = null, $id_category = null, $count = false, $order_by = null, $order_way = null, Context $context = null){
Product::getNewProducts((int) $this->context->language->id, 0, (int)Configuration::get('NEW_PRODUCTS_NBR'), 18, 30);