Sonata\Component\Order\OrderInterface::getCurrency PHP Method

    public function getCurrency();

 /**
  * @param OrderInterface  $order
  * @param BasketInterface $basket
  *
  * @return BasketInterface
  */
 public function transformIntoBasket(OrderInterface $order, BasketInterface $basket)
 {
     $event = new OrderTransformEvent($order);
     $this->eventDispatcher->dispatch(TransformerEvents::PRE_ORDER_TO_BASKET_TRANSFORM, $event);
     // we reset the current basket
     $basket->reset(true);
     $basket->setCurrency($order->getCurrency());
     $basket->setLocale($order->getLocale());
     // We are free to convert !
     foreach ($order->getOrderElements() as $orderElement) {
         /*
          * @var $orderElement OrderElementInterface
          */
         $provider = $this->productPool->getProvider($orderElement->getProductType());
         $manager = $this->productPool->getManager($orderElement->getProductType());
         $product = $manager->findOneBy(array('id' => $orderElement->getProductId()));
         if (!$product) {
             continue;
         }
         $basketElement = $provider->createBasketElement($product, $orderElement->getOptions());
         $basketElement->setQuantity($orderElement->getQuantity());
         $provider->basketAddProduct($basket, $product, $basketElement);
     }
     $basket->setCustomer($order->getCustomer());
     $basket->buildPrices();
     $event = new BasketTransformEvent($basket);
     $this->eventDispatcher->dispatch(TransformerEvents::POST_ORDER_TO_BASKET_TRANSFORM, $event);
     return $basket;
 }