require_once('sdk/src/facebook.PHP');
require_once("AppInfo.PHP");
function idx(array $array,$key,$default = null) {
  return array_key_exists($key,$array) ? $array[$key] : $default;
}
function he($str) {
  return htmlentities($str,ENT_QUOTES,"UTF-8");
}
$facebook = new Facebook(array(
  'appId'  => AppInfo::appID(),'secret' => AppInfo::appSecret(),'sharedSession' => true,'trustForwarded' => true,));

$arrayForJSON=array();
$user = $facebook->getUser();
$friends = idx($facebook->api('/me/friends'),'data',array());
if ($friends) {
  $arrayForJSON['friends']=$friends;
}
print_r($friends);

我真的不知道如何解决它,我一直在搜索和尝试许多答案在stackoverflow