function fb_is_app_user in Drupal for Facebook 6.2

Facebook provides a method, users_isAppUser(), which is buggy and unreliable. So we need to implement our own.

File

./fb.module, line 387

Code

function fb_is_app_user($fb) {
  if ($fb->api_client->added || $fb->api_client->is_user) {
    return TRUE;
  }
  else {
    return $fb->api_client->users_isAppUser;
  }
}