mysql - 在PHP中可以通过pcntl_fork函数生成进程，但官方说...
在PHP中可以通过pcntl_fork函数生成进程，但官方说当其被用于Web服务环境时可能会带来意外的结果。 不知道你们用过没有，会有什么意外后果？
因为我想通过PHP来完成一件事，但是我想通过启动多个PHP进程来一起完成这件事，于是就想到了pcntl_fork函数，但对进程又不了解，不知道这种想法是否可行，如果可行的话，是怎么实现的呢？
回复内容：
在PHP中可以通过pcntl_fork函数生成进程，但官方说当其被用于Web服务环境时可能会带来意外的结果。 不知道你们用过没有，会有什么意外后果？
因为我想通过PHP来完成一件事，但是我想通过启动多个PHP进程来一起完成这件事，于是就想到了pcntl_fork函数，但对进程又不了解，不知道这种想法是否可行，如果可行的话，是怎么实现的呢？
总是会有人批评PHP进程常驻时内存管理等的问题，不过：
https://github.com/CoderKungfu/php-queue
https://github.com/chrisboulton/php-resque
这两个库的模式都是用一个只负责fork的主进程配合fork出来的worker进程来实现可靠/易管理的“常驻”，主进程干的事少，而worker干完活就退出了，所以，可以放心用。
apache、 fastcgi、php-fpm 模式下生的子进程都是有生命周期的，超时后可能会被干掉，或者变狠成僵尸。
直接可以通过popen函数来实现你的需求。我经常这样做
这样生成的进程难以管理,官方也不建议使用的
这种做法违背了php的语言特性,php一次请求到响应结束就是一个生命周期
pcntl系的函数,个人建议是跑php的cli模式的时候用最好.
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