PHP 视频或信息 保持唯一推荐

$redis = RedisCli();
$origicount = $redis->scard('original');//  查看数据是否为空
if(!$origicount){
    $recommend = M('video')->field('videoId')->where("is_original = 1 and status = 2 and look_type = 1")->order('videoId asc')->select();
    foreach ($recommend as $v){
        $redis->sadd('original',$v['videoId']);  //添加集合
    }
}
$srand = $redis->srandmember('original',20);  //随机获取20个id
$where['videoId'] = array('in',$srand);
$list=M('video')->field('videoId,memberId,video_title,video_img,video_pathwater,price')->where($where)->select();
foreach ($srand as $vv){
    $redis->srem('original',$vv);//删除redis集合
}
if($origicount < 40){  //如果少于40 就应该升序查询数据库了
    $desc = M('video')->field('videoId')->where("is_original = 1 and status = 2 and look_type = 1")->order('videoId desc')->select();
    foreach ($desc as $de){
        $redis->sadd('original',$de['videoId']);
    }
}