pcntl 实现多进程代码

<p>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

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