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This article shares with you the content of an example analysis of php multithreading. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

PHP does not support multithreading by default. To use multithreading, you need to install the pthread extension, and to install the pthread extension, you must recompile PHP with the-- enable-maintainer-zts parameter, which specifies that PHP is compiled in a thread-safe way.

Does php support multithreading?

If (function_exists ('date_default_timezone_set')) {

Date_default_timezone_set ('PRC')

}

Functiona () {

$time=time (); sleep (3)

$fp=fopen ('result_a'.$time.'.log','w')

Fputs ($fp,'Setin'.Date ('hdouble idouble) microtime (). Rn)

Fclose ($fp)

}

Functionb () {

$time=time ()

Sleep (3)

$fp=fopen ('result_b'.$time.'.log','w')

Fputs ($fp,'Setin'.Date ('hdouble idouble) microtime (). Rn)

Fclose ($fp)

}

If (! isset ($_ GET ['act'])) $_ GET [' act'] ='a'

If ($_ GET ['act'] = =' a') {

A ()

}

Elseif ($_ GET ['act'] = =' b') b ()

? >

The above code, write a file locally.

PHP multi-thread reads and writes files:

If you visit localhost/a.php and open the two browser tabs at the same time as quickly as possible, you will find that the difference in creation time between the two files is 3 seconds.

But if you visit localhost/a.php?act=b and visit / a.php?act=a, you will find that the two files are created at about the same time.

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

If there is a download action inside php

FunctionrunThread () {

}

If ($_ GET ['act'] = =' run') {

Echo'start:'

RunThread ()

Echo'End'

}

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

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