PHP用redis做站内消息盒子

最近在工作中遇到一个需求，要面向所有用户发送公告，用户可以删除或者设为已读。这个用数据没办法去实现，我用redis模拟结合数据的方式去实现这个功能。说了这么多废话，还是来点干货吧。
直接贴代码

<?php
/**
 * 消息列表类
 *    redis key类型为 set
 *        yxt_notice_read_  已读列表（表后缀 uid除以1000）
 *                  存储方式：  键值 消息id 用户id(逗号拼接)
 *        yxt_notice_del  已读列表
 *                  存储方式：  键值  用户id 消息id(逗号拼接)
 *        author  fong
 */

class MessageBox extends Redis
{
    public  $uid;
    private $readListKey='yxt_notice_read_';
    private $delListKey ='yxt_notice_del';
    public  $mid;        //消息id
    private $listSize=1000;
    private $init = false;    
   public function __construct()
   {
       $this->connect(config('redis.host'), config('redis.port'));
       $this->auth(config('redis.password'));
   }
    //添加一条已读信息
   public function read($uid,$mid){
       $this->uid = $uid;
       $this->mid = $mid;
       $this->buildKey();
        $res = $this->hGet($this->readListKey,$this->mid);
        if(isset($res) && in_array($this->uid,explode(',',$res))) return;
        if(empty($res)) $res='';
        $this->hSet($this->readListKey,$this->mid,$res.','.$this->uid);
   }

    public function getIndexKey(){
        return ceil( $this->uid / $this->listSize );
    }
    //删除一条已读信息
    public function del($uid,$mid){
        $this->uid = $uid;
        $this->mid = $mid;
        $this->buildKey();
        $res = $this->hGet($this->delListKey,$this->uid);
        if(isset($res) && in_array($this->mid,explode(',',$res))) return;
        if(empty($res)) $res='';
        $this->hSet($this->delListKey,$this->uid,$res.','.$this->mid);
    }
    //拼接已读列表键值
    public function buildKey(){
        if($this->init) return;    //防止多次循环的时候，改变键值
        $this->readListKey = $this->readListKey.$this->getIndexKey() ;
        $this->init = true;
    }
    //获取用户已读列表
    public function getReadList($uid){
        $this->uid = $uid;
        $this->buildKey();
        $res = $this->hGetAll($this->readListKey);
        foreach ( $res as $k=>$v ) {
            if(in_array($uid,explode(',',$v))){
                $lists[] = $k;
            }
        }
        return $lists;
    }
    //获取用户已删除的列表
    public function getDelList($uid){
        $this->uid = $uid;
        $this->buildKey();
       // var_dump($this->hGet($this->delListKey,$this->uid));die;
        return trim($this->hGet($this->delListKey,$this->uid),',');
    }

}