redis文章评论

public function article(){
        $article_id=I('id');
        $redis=$this->getRedis();
        if(IS_POST)
        {
            $content=I('content');
            $time=time();
            $comment=(object) null;
            $comment->content=$content;
            $comment->time=$time;
            $c1=json_encode($comment);
            if ($redis->exists('listC'))
            {
                //加入队列
                $redis->rpush('listC',$c1);
                //dump($redis->lrange('listC',0,-1));
            }
            else{
                //初始化一个sort set
                $redis->rpush('listC',$c1);
            }
            dump($c1);
        }
        //list_id
        $comments= $redis->lrange('listC',-3,-1);
        $cos=array();
        foreach ($comments as $key=> $value)
        {
            $cos[$key]['content']=json_decode($value)->content;
            $cos[$key]['time']=json_decode($value)->time;
        }
        dump($cos);
        arsort($cos);

        if (!$article_id)
        {
            $article_id=1;
        }

        $mysqli=new \mysqli('localhost','root','root','ad');
        if ($mysqli->connect_errno) {
            printf("Connect failed: %s\n", $mysqli->connect_error);
            exit();
        }
        $sql='select * from article where id ='.$article_id;

        $rs= $mysqli->query($sql);
        $info=$rs->fetch_all();
        dump($cos);
        $this->assign('info',$info[0]);
        $this->assign('comment',$cos);
        $this->display();
    }