Facebook Graph API PHP 2.10没有返回电子邮件地址

Question

我尝试使用fb graph api版本2.10获取用户详细信息，但根本无法获取电子邮件地址..我尝试在谷歌搜索但没有得到2.10的任何答案。

我的代码如下：

require 'src/Facebook/autoload.php';

$fb = new \Facebook\Facebook([
  'app_id' => 'xxxxxxxx',
  'app_secret' => 'xxxxxxxxxxxxxxxxxxxx',
  'default_graph_version' => 'v2.9',
  // 'default_access_token' => 'qRkpJ79uoLmP6EU649rXAx4bZHs', // optional
]);

$helper = $fb->getRedirectLoginHelper(); 

// Use one of the helper classes to get a Facebook\Authentication\AccessToken entity.
//   $helper = $fb->getRedirectLoginHelper();
//   $helper = $fb->getJavaScriptHelper();
//   $helper = $fb->getCanvasHelper();
//   $helper = $fb->getPageTabHelper();

try {
  // Get the \Facebook\GraphNodes\GraphUser object for the current user.
  // If you provided a 'default_access_token', the '{access-token}' is optional.
  $response = $fb->get('/me?fields=id,email,first_name,last_name,website,work', 'xxxxxxxxxxxxxxxxxxxx');
} 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;
}

$me = $response->getGraphUser();
print_r($me);