$product_id_ary = array();
		foreach($this->cartSession[$productTypeId] as $key => $value){
			if($value['productsClass']['product_id'] AND preg_match('/^[0-9]+$/',$value['productsClass']['product_id'])){
				$product_id_ary[$value['productsClass']['product_id']] = $value['productsClass']['product_id'];
			}
		}
		sort($product_id_ary);