php redis怎么实现定时任务

; notify-keyspace-events ""

notify-keyspace-events "Ex"

<?php
$redis = new Redis();
$redis->connect('192.168.31.111', '6379');
$redis->setOption(Redis::OPT_READ_TIMEOUT, -1);
$redis->setEx('k1', 3, 5); // 3 秒过期
//$redis_db = '0'; // 监听 0 号库
$redis_db = '*'; // 监听所有库
$redis->psubscribe([
    '__keyevent@' . $redis_db . '__:expired'
], 'keyCallback');
// 回调方法
function keyCallback($redis, $pattern, $channel, $msg)
{
    var_dump($redis);
    var_dump($pattern);
    var_dump($channel);
    var_dump($msg);
}

object(Redis)#1 (0) {
}
string(22) "__keyevent@*__:expired"
string(22) "__keyevent@0__:expired"
string(2) "k1"

setex foo 3 bar