Symfony\Component\HttpFoundation\Request::hasSession PHP Method

    public function hasSession()
    {
        return null !== $this->session;
    }

 /**
  * {@inheritdoc}
  */
 public function collect(Request $request, Response $response, \Exception $exception = null)
 {
     $responseHeaders = $response->headers->all();
     $cookies = array();
     foreach ($response->headers->getCookies() as $cookie) {
         $cookies[] = $this->getCookieHeader($cookie->getName(), $cookie->getValue(), $cookie->getExpiresTime(), $cookie->getPath(), $cookie->getDomain(), $cookie->isSecure(), $cookie->isHttpOnly());
     }
     if (count($cookies) > 0) {
         $responseHeaders['Set-Cookie'] = $cookies;
     }
     $attributes = array();
     foreach ($request->attributes->all() as $key => $value) {
         if (is_object($value)) {
             $attributes[$key] = sprintf('Object(%s)', get_class($value));
             if (is_callable(array($value, '__toString'))) {
                 $attributes[$key] .= sprintf(' = %s', (string) $value);
             }
         } else {
             $attributes[$key] = $value;
         }
     }
     $content = null;
     try {
         $content = $request->getContent();
     } catch (\LogicException $e) {
         // the user already got the request content as a resource
         $content = false;
     }
     $this->data = array('format' => $request->getRequestFormat(), 'content' => $content, 'content_type' => $response->headers->get('Content-Type') ? $response->headers->get('Content-Type') : 'text/html', 'status_code' => $response->getStatusCode(), 'request_query' => $request->query->all(), 'request_request' => $request->request->all(), 'request_headers' => $request->headers->all(), 'request_server' => $request->server->all(), 'request_cookies' => $request->cookies->all(), 'request_attributes' => $attributes, 'response_headers' => $responseHeaders, 'session_attributes' => $request->hasSession() ? $request->getSession()->all() : array(), 'flashes' => $request->hasSession() ? $request->getSession()->getFlashBag()->peekAll() : array(), 'path_info' => $request->getPathInfo());
 }