How does the single-threaded programming language PHP implement multi-threaded operations?

Everyone knows that the language PHP itself can only be single-threaded. After one step of operation is completed, the next step is executed.

But sometimes we need asynchronous operations and multiple threads running at the same time.

Let’s introduce how PHP implements multi-threaded operations.

The code is as follows: For reference only

<?php
/**
 * @title:        PHP多线程类(Thread)
 * @version:    1.0
 * @author:        php.cn < web@php.cn >
 * @published:    2010-11-2
 * 
 * PHP多线程应用示例：
 *  require_once &#39;thread.class.php&#39;;
 *  $thread = new thread();
 *  $thread->addthread(&#39;action_log&#39;,&#39;a&#39;);
 *  $thread->addthread(&#39;action_log&#39;,&#39;b&#39;);
 *  $thread->addthread(&#39;action_log&#39;,&#39;c&#39;);
 *  $thread->runthread();
 *  
 *  function action_log($info) {
 *      $log = &#39;log/&#39; . microtime() . &#39;.log&#39;;
 *      $txt = $info . "\r\n\r\n" . &#39;Set in &#39; . Date(&#39;h:i:s&#39;, time()) . (double)microtime() . "\r\n";
 *      $fp = fopen($log, &#39;w&#39;);
 *      fwrite($fp, $txt);
 *      fclose($fp);
 *  }
 */
class thread {
    var $hooks = array();
    var $args = array();
    function thread() {
    }
    function addthread($func)
    {
        $args = array_slice(func_get_args(), 1);
        $this->hooks[] = $func;
        $this->args[] = $args;
        return true;
    }
    function runthread()
    {
        if(isset($_GET[&#39;flag&#39;]))
        {
            $flag = intval($_GET[&#39;flag&#39;]);
        }
        if($flag || $flag === 0)
        {
            call_user_func_array($this->hooks[$flag], $this->args[$flag]);
        }
        else
        {
            for($i = 0, $size = count($this->hooks); $i < $size; $i++)
            {
                $fp=fsockopen($_SERVER[&#39;HTTP_HOST&#39;],$_SERVER[&#39;SERVER_PORT&#39;]);
                if($fp)
                {
                    $out = "GET {$_SERVER[&#39;PHP_SELF&#39;]}?flag=$i HTTP/1.1\r\n";
                    $out .= "Host: {$_SERVER[&#39;HTTP_HOST&#39;]}\r\n";
                    $out .= "Connection: Close\r\n\r\n";
                    fputs($fp,$out);
                    fclose($fp);
                }
            }
        }
    }
}
$thread = new thread();
$thread->addthread(&#39;func1&#39;,&#39;info1&#39;);
$thread->addthread(&#39;func2&#39;,&#39;info2&#39;);
$thread->addthread(&#39;func3&#39;,&#39;info3&#39;);
$thread->runthread();
//说明：
//addthread是添加线程函数，第一个参数是函数名，之后的参数（可选）为传递给指定函数的参数。
//runthread是执行线程的函数。

This article is provided by PHP Chinese website and introduces how to use PHP to simulate multi-threading functions.

Article address: http://www.php.cn/php-weizijiaocheng-377481.html

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