ShoppingCart::archiveorderid PHP Method

    public function archiveorderid($requestedOrderId = null)
    {
        $sessionId = Session::get(self::config()->cartid_session_name);
        $order = Order::get()->filter("Status:not", "Cart")->byId($sessionId);
        if ($order && !$order->IsCart()) {
            OrderManipulation::add_session_order($order);
        }
        // in case there was no order requested
        // OR there was an order requested AND it's the same one as currently in the session,
        // then clear the cart. This check is here to prevent clearing of the cart if the user just
        // wants to view an old order (via AccountPage).
        if (!$requestedOrderId || $sessionId == $requestedOrderId) {
            $this->clear();
        }
    }