使用PHP执行并行事件的最简单方法是什么？ [重复]

Question

This question already has an answer here:

• How can one use multi threading in PHP applications 17 answers

The problem is simple. I want to continuously execute a function while I wait for another task to finish, like in this silly example:

#!/usr/bin/env php
<?php

$timer = function() {
  static $seconds = 0;
  while(1) {
    sleep(1);
    echo "", $seconds++;
  }
}

$timer(); // I want to run this in parallel

$service = new Service();
$response = $service->goGetSomething('from far far away');

// I want to kill the timer here

I do parallel processing with other languages all the time, but have no idea how to achieve this with PHP. Requirements:

• The simplest solution as possible, ++ if you use only PHP extensions enabled by default.
• I don't need Windows support :)

PS: Don't tell me to use nodejs or [your-favorite-language] that doesn't suck :)

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Answer 1

Depending on how PHP is configured, it's generally attached to a single thread (1 thread per request because this is a web scripting language). So that means synchronous execution.

The only way I could think of doing something like this would be to load a page that does an AJAX call (where the other thread is asynchronous). I can't think of any way to do that in the original thread because, by definition, all threads are autistic (thread A doesn't know what thread B is doing, etc)