php__silex__book/src/demo/Controllers/StreamController.php

<?php

namespace demo\Controllers;

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

/**
 * Class StreamController demos streaming of static files and custom content.
 *
 * @package demo\Controllers
 */
class StreamController {
  public function customStream(Application $app) {
    $noise = base64_encode(random_bytes(2048));
    $stream = fopen('php://memory', 'r+');
    fwrite($stream, $noise);
    rewind($stream);
    $streamer = function () use($stream) {
      while (!feof($stream)) {
        echo fread($stream, 1024);
        ob_flush();
        flush();
      }
      fclose($stream);
    };
    return $app->stream($streamer, Response::HTTP_OK, ['Content-type' => 'text/plain']);
  }

  public function fileStream(Application $app) {
    return $app->sendFile('/etc/passwd');
  }
}