为什么PHP不支持多线程? [英] Why does PHP not support multithreading?

问题描述

我到处都读到PHP不支持多线程，但是有解决方法.但是为什么 PHP不支持多线程?对于服务器端脚本语言，这似乎是一个明显的遗漏.

I've read everywhere that PHP does not support multithreading but there are workarounds. But why does PHP not support multithreading? For a server-side scripting language, that seems like a glaring omission.

推荐答案

几年后您可以将pthreads用于PHP多线程，但是您真的要这么做吗?

Edit several years later: you can use pthreads for PHP multithreading, but do you really want to?

我不确定pthreads在许多托管环境中是否可用.坦率地说，我不急于找出答案.

I'm not sure if pthreads is available on many hosting environments. And frankly I am not in a rush to find out.

对于许多应用程序来说，PHP的最大优势之一就是它的隔离性:一个过程，一个请求.通常，通过在请求期间对作业进行排队，然后在其他地方执行来完成多处理.例如，Laravel具有队列": https://laravel.com/docs/5.7/queues

One of PHP's biggest strengths for many applications is its isolation: one process, one request. Multi-processing is usually done by queuing a job during a request and executing it somewhere else. For example, Laravel has "queues": https://laravel.com/docs/5.7/queues

由于PHP并不是在考虑多线程的情况下编写的，因此添加它将是一项巨大的工作(基本上是100％重写).

Because PHP was not written with multithreading in mind and it would be a huge effort (basically a 100% rewrite) to add it in.

有人会说PHP几乎是一大堆: http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-design/.从这个角度来看，不包含线程也就不足为奇了.

Some would say that PHP is pretty much a gigantic pile: http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-design/. From that perspective it is not surprising that threading is not included.

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