test.php

use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\Session\Storage\Handler\NativeFileSessionHandler;
use Symfony\Component\HttpFoundation\Session\Storage\MetadataBag;
use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Cookie;
use Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory;
use Zend\Diactoros\Response\SapiStreamEmitter;

require dirname(__DIR__) . '/vendor/autoload.php';

$factory = new DiactorosFactory();
$sessionHandler = new NativeFileSessionHandler();
$sessionMetadataBag = new MetadataBag('_sf2_meta', '0');
$sessionStorage = new NativeSessionStorage(['cookie_httponly' => true, 'gc_probability' => 1], $sessionHandler, $sessionMetadataBag);
$session = new Session($sessionStorage, new AttributeBag(), new FlashBag());

$session->start();

$foundationResponse = new Response();

if (isset($_GET['set_cookie'])) {
    // emulate Symfony authentication
    $session->migrate(true);

    // emulate Symfony rememberme
    $foundationResponse->headers->setCookie(new Cookie('REMEMBERME', 'value', time() + 123456, '/', $_GET['set_cookie']));
}

$response = $factory->createResponse($foundationResponse);

$emitter = new SapiStreamEmitter();
$emitter->emit($response);

exit;