set('state', $state);
     // Set the client ID, token state, and application name in the HTML while
     // serving it.
     return $app['twig']->render('index.html', array(
      'CLIENT_ID' => CLIENT_ID,
      'STATE' => $state,
      'APPLICATION_NAME' => APPLICATION_NAME
     ));

      // Ensure that this is no request forgery going on, and that the user
     // sending us this connect request is the user that was supposed to.
    if ($request->get('state') != ($app['session']->get('state'))) {
    return new Response('Invalid state parameter', 401);
   }


    $code = $request->getContent();
    $gPlusId = $request->get['gplus_id'];
    // Exchange the OAuth 2.0 authorization code for user credentials.
    $client->authenticate($code);

    $token = json_decode($client->getAccessToken());
    // Verify the token
    $reqUrl = 'https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=' .
          $token->access_token;
    $req = new Google_HttpRequest($reqUrl);

    $tokenInfo = json_decode(
      $client::getIo()->authenticatedRequest($req)->getResponseBody());

     // If there was an error in the token info, abort.
    if ($tokenInfo->error) {
    return new Response($tokenInfo->error, 500);
    }
     // Make sure the token we got is for the intended user.
     if ($tokenInfo->userid != $gPlusId) {
      return new Response(
        "Token's user ID doesn't match given user ID", 401);
     }
    // Make sure the token we got is for our app.
    if ($tokenInfo->audience != CLIENT_ID) {
    return new Response(
        "Token's client ID does not match app's.", 401);
    }

    // Store the token in the session for later use.
    $app['session']->set('token', json_encode($token));
    $response = 'Succesfully connected with token: ' . print_r($token, true);
   ?>

Это мой code.php.

Я взял этот код изhttps://developers.google.com/+/web/signin/server-side-flow, Я хочу добавить регистрацию на стороне сервера Google + в свое приложение. поэтому я решил запустить пример кода. Я получаю ошибку, пока я запускаю код. Я уже включил клиентскую библиотеку API Google для PHP. Я не могу использовать функцию set и render, которые показаны в коде

this is My index.html


    
    
    
    
    
    
    
     (function () {
      var po = document.createElement('script');
      po.type = 'text/javascript';
      po.async = true;
      po.src = 'https://plus.google.com/js/client:plusone.js?onload=start';
      var s = document.getElementsByTagName('script')[0];
      s.parentNode.insertBefore(po, s);
    })();
  
  






  <span class="g-signin" data-scope="https://www.googleapis.com/auth/plus.login" data-clientid="YOUR_CLIENT_ID" data-redirecturi="postmessage" data-accesstype="offline" data-cookiepolicy="single_host_origin" data-callback="signInCallback">
  </span>



    
   

      function signInCallback(authResult) {
      if (authResult['code']) {

      // Hide the sign-in button now that the user is authorized, for example:
     $('#signinButton').attr('style', 'display: none');

     // Send the code to the server
     $.ajax({
      type: 'POST',
      url: 'plus.php?storeToken',
      contentType: 'application/octet-stream; charset=utf-8',
      success: function(result) {
        // Handle or verify the server response if necessary.

        // Prints the list of people that the user has allowed the app to know
        // to the console.
        console.log(result);
        if (result['profile'] && result['people']){
          $('#results').html('Hello ' + result['profile']['displayName'] + '. You successfully made a server side call to people.get and people.list');
        } else {
          $('#results').html('Failed to make a server-side call. Check your configuration and console.');
        }
      },
      processData: false,
      data: authResult['code']
    });
    }  
     else if (authResult['error']) {
      // There was an error.
      // Possible error codes:
      //   "access_denied" - User denied access to your app
      //   "immediate_failed" - Could not automatially log in the user
      // console.log('There was an error: ' + authResult['error']);
    }
    }