Swamp of POX with Silex

app.php

<?php
$app = new \Silex\Application();


$doOrder = function(\SimpleXMLElement $order) {
    $orderService = new OrderService();
    $orderService->setBeerId((string) $order['beer_id']);
    $creditCard = CreditCardFactory::fromXml($order->CreditCard);
    $orderService->setCreditCard($creditCard);
    $order = $orderService->createOrder();
    return XmlMapper::map($order);
};

$getOrderStatus = function(\SimpleXMLElement $status) {
    $statusFetcher = new StatusFetcher();
    $statusFetcher->setOrderId((string) $status['order_id']);
    $status = $statusFetcher->fetch();
    return XmlMapper::map($status);
};

$app->post('/orderService', function(Request $request) use ($doOrder, $getOrderStatus) {
    $body = simplexml_load_string($request->getContent());
    $name = $body->getName();
    switch ($name) {
        case: 'OrderRequest':
            return $doOrder($body);
        case: 'OrderStatusRequest':
            return $getOrderStatus($body);
        default:
            return ErrorHandler::handle();
    }
});

A request for placing an order might look like this:

POST /orderService HTTP/1.1

<OrderRequest beer_id="54cd34ecde3">
  <CreditCard number="4444444444444441" cvc="123" expires="10/15" />
</OrderRequest>

And its response might look like this:

<Order id="54def5cde" placed="2014-05-06:11:11:11" />

A request for checking the status of an order might look like this:

POST /orderService HTTP/1.1

<OrderStatusRequest order_id="54def5cde" />

With a response that might look like this:

<OrderStatus status="pending" />