heroku - facebook graph API does not return event -


i trying use graph api call return events of user logged in app. , $event null time although have created bunch of events myself, help?

here code login event api call: 

require_once('appinfo.php');  // enforce https on production if (substr(appinfo::geturl(), 0, 8) != 'https://' && $_server['remote_addr'] != '127.0.0.1') {   header('location: https://'. $_server['http_host'] . $_server['request_uri']);   exit(); }  // provides access helper functions defined in 'utils.php' require_once('utils.php');     require_once('sdk/src/facebook.php');  $facebook = new facebook(array(   'appid'  => appinfo::appid(),   'secret' => appinfo::appsecret(),   'sharedsession' => true,   'trustforwarded' => true, ));  $user_id = $facebook->getuser(); if ($user_id) {   try {     // fetch viewer's basic information     $basic = $facebook->api('/me');   } catch (facebookapiexception $e) {     // if call fails check if still have user. user     // cleared if error because of invalid accesstoken     if (!$facebook->getuser()) {       header('location: '. appinfo::geturl($_server['request_uri']));       exit();     }   }    // fetches things . 'limit=*" returns * values.   // see format of data retrieving, use "graph api   // explorer" @ https://developers.facebook.com/tools/explorer/   $likes = idx($facebook->api('/me/likes?limit=4'), 'data', array());    // fetches 4 of friends.   $friends = idx($facebook->api('/me/friends?limit=4'), 'data', array());    // , returns 16 of photos.   $photos = idx($facebook->api('/me/photos?limit=16'), 'data', array());    // fetch event information  // $events = idx($facebook->api('/me/events?limit=5'), 'data', array());   $events = $facebook->api('/me/events','get');   print("11111");   if($events == null) print("empty");

i see no login code in example, sure user logged in? see php sdk "usage": https://github.com/facebook/facebook-php-sdk

anyway, tried in 1 of projects, user events same call need permission "user_events":

$facebook->getloginurl(array('scope' => 'user_events'));

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