永久运行PHP脚本，访问队列 [英] Have a PHP script run forever, access a queue
问题描述
另请参见永远让PHP脚本循环从队列系统执行计算工作，但这并不能回答我的所有问题.
See also Having a PHP script loop forever doing computing jobs from a queue system, but that doesn't answer all my questions.
如果我想永远运行PHP脚本，请访问队列并执行作业:
If I want to run a PHP script forever, accessing a queue and doing jobs:
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潜在的内存问题是什么?如何避免它们? (是否有任何冲洗函数或我应该使用的东西?)
What is the potential for memory problems? How to avoid them? (any flush functions or something I should use?)
如果脚本由于某种原因而死怎么办?自动重新启动的好方法是什么?
What if the script dies for some reason? What would be a good method to automatically start it up again?
什么是启动脚本的最佳基本方法.由于它永远运行，所以我不需要cron.但是我该如何启动呢? (另请参阅2.)
What would be the best basic approach to start the script. Since it runs forever, I don't need cron. But how do I start it up? (See also 2.)
推荐答案
将队列设置为cron脚本.让它每10秒执行一次.脚本启动后，检查是否存在锁定文件(如.lock之类的东西).如果有，请立即退出.如果不是，请创建.lock并开始处理.如果发生任何错误，请通过电子邮件/日志记录这些错误，删除.lock并退出.如果没有任务，请退出.
Set the queue up as a cron script. Have it execute every 10 seconds. When the script fires up, check if there's a lock file present (something like .lock). If there is, exit immediately. If not, create the .lock and start processing. If any errors occur, email/log these errors, delete .lock and exit. If there's no tasks, then exit.
我认为这种方法是理想的，因为PHP并非真正能够像您要求的那样长时间运行脚本.为了避免潜在的内存泄漏，崩溃等情况，连续执行脚本是一种更好的方法.
I think this approach is ideal, since PHP isn't really designed to be able to run a script for extended periods of time like you're asking. To avoid potential memory leaks, crashes etc, continuously executing the script is a better approach.
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