php__silex__book/src/demo/Middleware/AfterAll.php

<?php

namespace demo\Middleware;

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

class AfterAll {

  /**
   * Arguments for before() middleware are fixed, unlike those of controllers.
   *
   * @param \Symfony\Component\HttpFoundation\Request $request
   * @param \Symfony\Component\HttpFoundation\Response $response
   * @param \Silex\Application $app
   *
   * @return \Symfony\Component\HttpFoundation\Response|void
   */
  public function __invoke(Request $request, Response $response, Application $app) {
    $MESSAGE = "<p>In aAM</p>\n";
    if ($response instanceof JsonResponse) {
      $content = $response->getContent();
      $raw = json_decode($content, TRUE);
      $raw[] = $MESSAGE;
      $newContent = json_encode($raw);
      $response->setContent($newContent);
      return $response;
    }

    // Only echo info on text responses.
    $ct = $response->headers->get('Content-Type');
    if (isset($ct) && strpos($ct, 'text') !== 0) {
      return;
    }
    echo $MESSAGE;
  }

}