Richardson maturity model: Resources + verbs with Silex

app.php

<?php
use Silex\Application;
use Symfony\Component\HttpFoundation\Request;

$app = new Application();

$app->post('/order', function(Request $request) {
    $service = new OrderService();
    $order = OrderFactory::fromArray($request->request->all());
    $service->setOrder($order);
    return json_encode($service->placeOrder());
});

$app->get('/order/{id}/status', function(Application $app, $id) {
    $order = OrderRepository::getById($id);
    if (! $order)
        $app->abort('404', "Order with id $id not found");
    return json_encode($order->getStatus());
});

$app->put('/order/{id}/status', function(Application $app, Request $request, $id) {
    $order = OrderRepository::getById($id);
    if (! $order)
        $app->abort('404', "Order with id $id not found");
    $order->setStatus($request->request->get('status');
    OrderRepository::update($order);
    return json_encode($order->getStatus());
});

We now introduce an HTTP interface that allows us to distinguish between safe and unsafe, cacheable and un-cacheable, idempotent and non-idempotent.