如何异步运行PHP脚本？ [英] How to run a PHP script asynchronously?

问题描述

我创建将通过命令行运行的PHP脚本。作为这个脚本的一部分，有次，我可能需要产卵/ fork一个不同的脚本，可能需要很长的时间才能完成。我不想从完成阻止原始脚本。如果我是用JavaScript这样做，我可以在后台运行AJAX请求。这本质上是什么，我想在这里做。我不需要的时候叉完全知道，只是他们开始和完成自己。

我如何异步运行这些PHP脚本？

 的foreach（$ lotsOfItems为$项目）{
    如果（$本期特价货品＆GT; needsExtraHelp）{
        //这里开始一些异步进程，并把它传递$项目
    }
}
 

解决方案

  $的PID =阵列（）;
的foreach（$ lotsOfItems为$项目）{
    如果（$本期特价货品＆GT; needsExtraHelp）{
        $ PID = pcntl_fork（）;
        如果（$ PID == 0）{
           //你的孩子
           后续代码var_dump（$项目）;
           出口（0）; //不要忘记这一个！
        }否则如果（$ PID == -1）{
           //未能叉过程
        }其他{
           //你父
           $的PID [] = $ PID;
        }
    }    usleep（100）; // $ P从高峰$ pvent CPU
    的foreach（$的PID为$ PID）{
        pcntl_waitpid（$ PID，$退出code，WNOHANG）; // prevents僵尸进程
    }
}
 

I am creating a PHP script that will be run via the command line. As part of this script, there are times where I might need to spawn/fork a different script that could take a long time to complete. I don't want to block the original script from completing. If I were doing this with JavaScript, I could run AJAX requests in the background. That is essentially what I am trying to do here. I don't need to know when the forks complete, just that they start and complete themselves.

How can I run these PHP scripts asynchronously?

foreach ($lotsOfItems as $item) {
    if ($item->needsExtraHelp) {
        //start some asynchronous process here, and pass it $item
    }
}

解决方案

$pids = array();
foreach ($lotsOfItems as $item) {
    if ($item->needsExtraHelp) {
        $pid = pcntl_fork();
        if ($pid == 0) {
           // you're in the child
           var_dump($item);
           exit(0); // don't forget this one!!
        } else if ($pid == -1) {
           // failed to fork process
        } else {
           // you're in the parent
           $pids[] = $pid;
        }
    }

    usleep(100); // prevent CPU from peaking
    foreach ($pids as $pid) {
        pcntl_waitpid($pid, $exitcode, WNOHANG); // prevents zombie processes
    }
}

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