分享PHP-pcntl 实现多进程代码


            PHP使用PCNTL系列的函数也能做到多进程处理一个事务。比如我需要从数据库中获取80w条的数据，再做一系列后续的处理，这个时候，用单进程？你可以等到明年今天了。。。所以应该使用pcntl函数了。

下面我们来看个实例

代码







<?php

$arChildId = array();



for($i = 0; $i < 10; $i++)

{

$iPid = pcntl_fork();

if($iPid == -1)

{

  die('can\'t be forked.');

}



if($iPid)

{

  # 主进程逻辑

  $arChildId[] = $iPid;

}

else

  {

  # 子进程逻辑

  $iPid = posix_getpid(); # 获取子进程的ID

  $iSeconds = rand(5, 30);

  echo '* Process '. $iPid. ' was created, and Executed, and Sleep '. $iSeconds. PHP_EOL;

  excuteProcess($iPid, $iSeconds);

  exit();

}

}



while(count($arChildId) > 0)

{

foreach($arChildId as $iKey=> $iPid)

{

  $res = pcntl_waitpid($iPid, $status, WNOHANG);



  if($res == -1 || $res > 0)

  {

    unset($arChildId[$iKey]);

    echo '* Sub process: '. $iPid. ' exited with '. $status. PHP_EOL;

  }

}

}



# 子进程执行的逻辑

function excuteProcess($iPid, $iSeconds)

{

file_put_contents('./log/'.$iPid.'.log', $iPid.PHP_EOL, FILE_APPEND);

sleep($iSeconds);

}

?>







运行结果







* Process 16163 was created, and Executed, and Sleep 11

* Process 16164 was created, and Executed, and Sleep 21

* Process 16165 was created, and Executed, and Sleep 24

* Process 16166 was created, and Executed, and Sleep 27

* Process 16167 was created, and Executed, and Sleep 8

* Process 16168 was created, and Executed, and Sleep 14

* Process 16169 was created, and Executed, and Sleep 14

* Process 16170 was created, and Executed, and Sleep 26

* Process 16171 was created, and Executed, and Sleep 20

* Process 16172 was created, and Executed, and Sleep 21

* Sub process: 16167 exited with 0

* Sub process: 16163 exited with 0

* Sub process: 16169 exited with 0

* Sub process: 16168 exited with 0

* Sub process: 16171 exited with 0

* Sub process: 16164 exited with 0

* Sub process: 16172 exited with 0

* Sub process: 16165 exited with 0

* Sub process: 16170 exited with 0

* Sub process: 16166 exited with 0