PHP multi-threaded concurrency implementation method

This article describes the multi-threaded concurrent implementation method of PHP. Share it for your reference, as follows:

Multi-threading in Java is a new thread thing. PHP relies on apache to rely on Linux to rely on a multi-threading method.

Here I will talk about how to simulate php concurrency if you cannot control the apache server

<?php
if(function_exists('date_default_timezone_set')) {
  date_default_timezone_set('PRC');
}
function a()
{
 $time = time();
 sleep(3);
 $fp = fopen('result_a'.$time.'.log', 'w');
 fputs($fp, 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn");
 fclose($fp);
}
function b()
{
 $time = time();
 sleep(3);
 $fp = fopen('result_b'.$time.'.log', 'w');
 fputs($fp, 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn");
 fclose($fp);
}
if(!isset($_GET['act'])) $_GET['act'] = 'a';
if($_GET['act'] == 'a')
{
 a();
}
else if($_GET['act'] == 'b') b();
?>

The above code writes a file locally.

If you access localhost/ open both browser tags as fast as possible, you will find that the two files are created at 3 seconds

But if you access localhost/?act=b Another access/?act=a You find that the two files were created almost the same time.

For apache, the same url means a thread (we or a process), but different URLs means concurrent.

If there is a download action inside php

function runThread()
{
 down("http://localhost/test/?act=a");
}
if($_GET['act'] == 'run')
{
 echo 'start:';
 runThread();
 echo ' End';
}

http://localhost/test/?act=run

http://localhost/test/?act=run&s=2

As long as the URL of the main access is different, it is considered to be different, which means concurrency. File creation time is not 3 seconds

Friends who have Linux servers locally can also use Linux to simulate concurrency

<?php
for ($i=0;$i<10;$i++) {
echo $i;
sleep(5);
}
?>

Save it above, and then write a SHELL code

#!/bin/bash
for i in 1 2 3 4 5 6 7 8 9 10
do
php -q  &
done

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I hope this article will be helpful to everyone's PHP programming.