PHP multithreading concurrency Implementation Method _php skills

This article describes the PHP multithreading concurrency implementation method. Share to everyone for your reference, specific as follows:

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

Here's how to simulate PHP concurrency if you can't control Apache servers

<?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 Ten
do
php-q test.php &
Done

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I hope this article will help you with the PHP program design.