public function setOrderItemsByRange($from = null, $to = null) { if (!isset($from)) { $from = StoreOrderList::getDateOfFirstOrder(); } if (!$to) { $to = date('Y-m-d'); } $orders = new StoreOrderList(); $orders->setFromDate($from); $orders->setToDate($to); $this->orderItems = $orders->getOrderItems(); }