php__silex__book/src/controllers.php

<?php

use Silex\Application;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

//Request::setTrustedProxies(array('127.0.0.1'));

$app->get('/', function () use ($app) {
  return $app['twig']->render('index.html.twig', []);
})
  ->bind('homepage');

$blogPosts = [
  1 => [
    'date' => '2011-03-29',
    'author' => 'igorw',
    'title' => 'Using Silex',
    'body' => '...It takes time on version changes...',
  ],
];
$app->get('/blog', function () use ($blogPosts) {
  $output = '';
  foreach ($blogPosts as $post) {
    $output .= $post ['title'];
    $output .= '<br />';
  }
  return $output;
});
$app->get('/blog/{id}', function (Application $app, $id) use ($blogPosts) {
    if (!isset ($blogPosts [$id])) {
      $app->abort(Response::HTTP_NOT_FOUND, "Post $id does not exist.");
    }
    $post = $blogPosts [$id];
    return "<h1> {$post['title']}</h1>" . "<p> {$post['body']} </p>";
  });
$app->post('/feedback', function (Application $app, Request $request) {
    $message = $request->get('message');
    mail($app['app.mail_to'], '[YourSite] Feedback', $message);
    return new Response ('Thank you for your feedback!', Response::HTTP_CREATED);
  });


$app->error(function (\Exception $e, Request $request, $code) use ($app) {
    if ($app['debug']) {
        return;
    }

    // 404.html, or 40x.html, or 4xx.html, or error.html
    $templates = array(
        'errors/'.$code.'.html.twig',
        'errors/'.substr($code, 0, 2).'x.html.twig',
        'errors/'.substr($code, 0, 1).'xx.html.twig',
        'errors/default.html.twig',
    );

    return new Response($app['twig']->resolveTemplate($templates)->render(array('code' => $code)), $code);
});