php to output facebook group member count

Question

I have a code that outputs member count of a facebook group. However, it does not show the correct number. 1.It will always show a less count 2.Sometimes it shows 0 I have installed the sdk and also I am a subscriber of the group where I am running this code so ideally it should permit me and give the correct result. Can someone shed some light on it?

<?php
  require_once('src/facebook.php');
  $config = array(
    'appId' => 'MY APP ID',
    'secret' => 'MY SECRET',
    'cookie' => true
  );
  $facebook = new Facebook($config);
  $query = urlencode("SELECT uid FROM group_member WHERE gid = 000000000000000");
  try {
    $fbData = $facebook->api("/fql?q={$query}");
    $member_count =  count($fbData['data']);
  } catch (FacebookApiException $e) {};
?>
<div><?php echo $member_count; ?></div>

Thanks

Answer 1

Correct appID and secret, check gid in mysql "$query"...

Do you have good src to facebook.php and you import lib ?