How to implement PHP multithreading concurrency

In Java, multithreading is a new thread of things, PHP relies on the Apache Linux Bottom has a multithreaded approach.

Tell me today if you can't manipulate Apache servers, how to simulate PHP concurrency

<?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 to write a file locally.
If you access localhost/a.php the two browser tabs open as fast as possible, you find that two file creation time is 3 seconds

But if you visit localhost/a.php?act=b another visit to/a.php?act=a you find that two files are created almost the same time.

For Apache, the same URL means a thread (we or a process), but a different URL means that it can be concurrent.

If there is a download action inside PHP

function Runthread ()
{
Down ("Http://localhost/test/a.php?act=a");
}
if ($_get[' act '] = = ' Run ')
{
Echo ' Start: ';

Runthread ();

echo ' End ';
}
Http://localhost/test/a.php?act=run

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

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

A friend with a local Linux server can also use Linux to simulate concurrency.

<?php
For ($i =0 $i <10; $i + +) {
echo $i;
Sleep (5);
}
?>
Save it as a test.php, then write a shell code

#!/bin/bash
For I in 1 2 3 4 5 6 7 8 9 10
Todo
Php-q test.php &
Done