php如何按照预定的时间改变一条信息的状态
发布一条信息，状态是有效，同时设置这条信息三天后状态改变为失效。当这条信息失效的同时，发一条消息给相关的用户。怎么做？PHP。
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发布一条信息，状态是有效，同时设置这条信息三天后状态改变为失效。当这条信息失效的同时，发一条消息给相关的用户。怎么做？PHP。
百度一下：
crontab和delay queue
定时器任务
定时或者脚本放后台
cron 做计划任务更改状态 开启daemon监听并通知目标
定时任务定时任务
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