/**
  * 点赞一条feed
  */
 public function praise()
 {
     $feedid = intval(I('post.feedid', ''));
     \Predis\Autoloader::register();
     $redis = new \Predis\Client();
     if ($redis->zscore('feed:' . $feedid . ':praise', ACPopedom::getID())) {
         $res = $redis->zrem('feed:' . $feedid . ':praise', ACPopedom::getID());
         $rs = $redis->hincrby('feed:' . $feedid, 'praise', -1);
         $this->ajaxReturn($res && $rs ? array('status' => true) : array('status' => false, 'message' => '由于服务器君罢工,取消点赞失败失败啦..'));
     } else {
         $rs = $redis->zadd('feed:' . $feedid . ':praise', time(), ACPopedom::getID());
         $result = $redis->hincrby('feed:' . $feedid, 'praise', 1);
         $this->ajaxReturn($result && $rs ? array('status' => true, 'message' => '点赞成功了,么么哒') : array('status' => false, 'message' => '由于服务器君罢工,点赞失败失败啦..'));
     }
 }