private function _get_friends($uid)
 {
     //$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->friends_ids(-1, 200, $uid);
     $users = array_merge($users, $result['ids']);
     while ($next_cursor = $result['next_cursor']) {
         break;
         $result = $weibocilent->friends_ids($next_cursor, 200, $uid);
         $users = array_merge($users, $result['ids']);
     }
     $users = array_unique($users);
     return $users;
 }