问Facebook v2.5 SDK问题？

EN

$fb = new Facebook\Facebook([
  'app_id' => 'app_id',
  'app_secret' => 'secret',
  'default_graph_version' => 'v2.5',
  ]);


$helper = $fb->getRedirectLoginHelper();
$permissions = ['email','user_about_me', 'user_likes', 'public_profile']; // optional

$helper = $fb->getRedirectLoginHelper();
try {
  $accessToken = $helper->getAccessToken();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  // When Graph returns an error
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  // When validation fails or other local issues
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}

$loginUrl = $helper->getLoginUrl('http://www.website.co.uk/triggerFacebook.php', $permissions);


if (isset($accessToken)) {
  $_SESSION['facebook_access_token'] = (string) $accessToken;
  
  // Sets the default fallback access token so we don't have to pass it to each request
$fb->setDefaultAccessToken($accessToken);

try {
  $response = $fb->get('/me');
  $userNode = $response->getGraphUser();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  // When Graph returns an error
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  // When validation fails or other local issues
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}
}