在PHP中并行执行功能 [英] Executing functions parallelly in PHP

问题描述

PHP可以调用一个函数，而不必等待它返回吗?所以像这样:

Can PHP call a function and don't wait for it to return? So something like this:

function callback($pause, $arg) {
    sleep($pause);
    echo $arg, "\n";
}

header('Content-Type: text/plain');
fast_call_user_func_array('callback', array(3, 'three'));
fast_call_user_func_array('callback', array(2, 'two'));
fast_call_user_func_array('callback', array(1, 'one'));

将输出

one (after 1 second)
two (after 2 seconds)
three (after 3 seconds)

而不是

three (after 3 seconds)
two (after 3 + 2 = 5 seconds)
one (after 3 + 2 + 1 = 6 seconds)

主脚本旨在作为永久进程(TCP服务器)运行. callback()函数将从客户端接收数据，执行外部PHP脚本，然后根据传递给callback()的其他参数进行操作.问题在于主脚本不得等待外部PHP脚本完成.外部脚本的结果很重要，因此exec('php -f file.php &')不是一个选择.

Main script is intended to be run as a permanent process (TCP server). callback() function would receive data from client, execute external PHP script and then do something based on other arguments that are passed to callback(). The problem is that main script must not wait for external PHP script to finish. Result of external script is important, so exec('php -f file.php &') is not an option.

许多人建议您看一下PCNTL，因此似乎可以实现这种功能. PCNTL在Windows中不可用，并且我现在无法访问Linux机器，因此我无法对其进行测试，但是如果有很多人建议，那么它应该可以解决这个问题:)

Many have recommended to take a look at PCNTL, so it seems that such functionality can be achieved. PCNTL is not available in Windows, and I don't have an access to a Linux machine right now, so I can't test it, but if so many people have advised it, then it should do the trick :)

谢谢大家！

推荐答案

在Unix平台上，您可以启用PCNTL功能，并使用

On Unix platforms you can enable the PCNTL functions, and use pcntl_fork to fork the process and run your jobs in child processes.

类似的东西:

function fast_call_user_func_array($func, $args) {
  if (pcntl_fork() == 0) {
    call_user_func_array($func, $args);
  }
}

一旦调用pcntl_fork，两个进程将从同一位置执行您的代码.父进程将获得pcntl_fork返回的PID，而子进程将获得0. (如果发生错误，父进程将返回-1，值得在生产代码中进行检查.)

Once you call pcntl_fork, two processes will execute your code from the same position. The parent process will get a PID returned from pcntl_fork, while the child process will get 0. (If there's an error the parent process will return -1, which is worth checking for in production code).

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