private function _get_followers($uid)
 {
     //$weiboclient = ZombieKiller_WeiboClientFactory::create();
     $weibocilent = new SaeTClient(WB_AKEY, WB_SKEY, $_SESSION['last_key']['oauth_token'], $_SESSION['last_key']['oauth_token_secret']);
     $users = array();
     $result = $weibocilent->followers(-1, $uid);
     $users = array_merge($users, $result['users']);
     while ($next_cursor = $result['next_cursor']) {
         break;
         $result = $weibocilent->followers($next_cursor, $uid);
         $users = array_merge($users, $result['users']);
     }
     return $users;
 }