title: Facebook php-sdk v4 get friend list
body: <p>i'm using new facebook php sdk v4 and I want to retrieve full list of friends 
  Code:</p>
  
  <pre><code>try {
  
  $user_friends = (new FacebookRequest(
    $session, 'GET', '/me/friends'
  ))-&gt;execute()-&gt;getGraphObject(GraphUser::className());
  
  echo '&lt;pre&gt;';
  print_r($user_friends);
  
   } catch(FacebookRequestException $e) {
  
  echo "Exception occured, code: " . $e-&gt;getCode();
  echo " with message: " . $e-&gt;getMessage();
  
  } 
  </code></pre>
  
  <p>But the result is:</p>
  
  <pre><code>Facebook\GraphUser Object
   (
  [backingData:protected] =&gt; Array
      (
      )
    )
  </code></pre>
  
  <p>Login url parameters:</p>
  
  <pre><code>$loginUrl = $helper-&gt;getLoginUrl(array( 'publish_actions', 'user_friends', 'public_profile' ) );
  </code></pre>
  
  <p>Is this feature is disabled? There is another way to get a list of friends?</p>
  
  <p>Thank you in advance</p>