test.php

ini_set('session.use_cookies', 1);
ini_set('session.save_handler', 'files');

session_name('PHPSESSID');

if (!session_start()) {
    throw new \RuntimeException('Failed to start the session');
}

if (isset($_GET['set_cookie'])) {
    // Emulate Symfony authentication `$session->migrate(true)`
    if (!session_regenerate_id(true)) {
        throw new \RuntimeException('Failed to regenerate the session');
    }

    // Emulate Symfony rememberme
    // Buggy behavior.
    header(sprintf('Set-Cookie: REMEMBERME=value; expires=Sat, 03-Sep-2020 05:38:43 GMT; path=/; domain=%s; httponly', $_GET['set_cookie']));

    // Uncomment to get the right behavior.
    // setcookie('REMEMBERME', 'value', time() + 12345, '/', $_GET['set_cookie']);
}

session_write_close();

exit;