PHP 随机取几条

    public function getList($type)
    {
        $list = Db::name('video')->field('id')->where('name','like', "%{$type}%")->select();
        if (empty($type)) {
            $list = Db::name('video')->field('id')->select();
        }

        $count = count($list);
        $rand_list=range(0, $count-1);
//        unset($rand_list[0]);
        $num = 10;
        if($count < $num){$num = $count-1;}   //判断是否取得条数大于查询到的条数
        $rand_list = array_rand($rand_list, $num);   //随机取几条
        $tuijian_array = array();
        foreach ((array)$rand_list as $key) {
            $tuijian_array[] = $list[$key]["id"];   //将随机出来的键取值
        }
        $randArr = Db::name('video')->where('id','in', $tuijian_array)->select();

        foreach ($randArr as &$value){
            $value["count"] = mt_rand(3000, 7000);
        }
        return $randArr;
    }