PHP 中的异步 HTTP 请求 [英] Asynchronous HTTP requests in PHP

问题描述

有没有什么理智的方法可以在 PHP 中异步发出 HTTP 请求而不抛出响应?即，类似于 AJAX 的东西 - PHP 脚本发起请求，做自己的事情，然后，当收到响应时，回调函数/方法或其他脚本处理响应.

Is there any sane way to make a HTTP request asynchronously in PHP without throwing out the response? I.e., something similar to AJAX - the PHP script initiates the request, does it's own thing and later, when the response is received, a callback function/method or another script handles the response.

我想到了一种方法 - 为每个请求生成一个带有另一个脚本的新 php 进程 - 第二个脚本执行请求，等待响应，然后解析数据并执行它应该做的任何事情，而原始脚本继续执行产生新的进程.不过，我对这种情况下的性能表示怀疑 - 每次都必须创建一个新进程，肯定会有一些性能损失.

One approach has crossed my mind - spawning a new php process with another script for each request - the second script does the request, waits for the response and then parses the data and does whatever it should, while the original script goes on spawning new processes. I have doubts, though, about performance in this case - there must be some performance penalty from having to create a new process every time.

推荐答案

是的，根据您网站的流量，生成一个单独的 PHP 进程来运行脚本可能是毁灭性的.使用 shell_exec() 启动后台进程将输出保存到您已知的文件名会更有效，但即使这样也可能占用大量资源.

Yes, depending on the traffic of your site, spawning a separate PHP process for running a script could be devastating. It would be more efficient to use shell_exec() to start a background process that saves the output to a filename you already know, but even this could be resource intensive.

您还可以将请求队列存储在数据库中.一个单独的后台进程将拉取作业、执行它并保存输出，可能会在数据库中设置一个标志，您的 Web 进程可以检查该标志.

You could also have a request queue stored in a database. A single, separate background process would pull the job, execute it, and save the output, possibly setting a flag in the DB that your web process could check.

如果您打算使用 DB 队列方法，请使用 curl_multi* 类函数一次发送所有排队的请求.这会将后台进程中每次迭代的执行时间限制为最长请求时间.

If you're going to use the DB queue approach, use curl_multi* class of functions to send all queued requests at once. This will limit the execution time of each iteration in your background process to the longest request time.

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