Php 可捕获的致命错误：传递给Symfony:：render（）的参数3必须是Symfony\..\Response的实例，数组给定

我想将2个数组传递到控制器中的

render

函数中

我该怎么做

现在我有这样的东西：

class GradebookController extends Controller
{
    /**
     * @Route("/gradebook", name="_gradebook")
     */
    public function indexAction()
    {

       if (!$this->get('security.authorization_checker')->isGranted('IS_AUTHENTICATED_FULLY')) {
           return $this->redirect($this->generateUrl('_login'));
       }

       $em = $this->getDoctrine()->getManager();

       $subject = $em->getRepository('AppBundle:Subject')->findAll();

       $students = $em->getRepository('AppBundle:User')->findBy(
           array('roles'=>'a:0:{}')
       );

       return $this->render('::gradebook.html.twig', array('students'=>$students),
                                                     array('subjects'=>$subject));
    }
}

---

将这两个键组合成一个具有多个键的数组

return $this->render('::gradebook.html.twig', array('students' => $students, 'subjects' => $subject));