PHP的pcntl多进程用法实例
这篇文章主要介绍了PHP的pcntl多进程用法,实例分析了pcntl操作多进程的使用技巧,非常具有实用价值,需要的朋友可以参考下
本文实例讲述了PHP的pcntl多进程用法。分享给大家供大家参考。具体分析如下:
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。
假设我想要启动20个进程,将1-80w的数据分成20份来做,主进程等待所有子进程都结束了才退出:
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$max = 800000; $workers = 20; $pids = array(); for($i = 0; $i $pids[$i] = pcntl_fork(); switch ($pids[$i]) { case -1: echo "fork error : {$i} \r\n"; exit; case 0: $param = array( 'lastid' => $max / $workers * $i, 'maxid' => $max / $workers * ($i+1), ); $this->executeWorker($input, $output, $param); exit; default: break; } } foreach ($pids as $i => $pid) { if($pid) { pcntl_waitpid($pid, $status); } } |
这里当pcntl_fork出来以后,会返回一个pid值,这个pid在子进程中看是0,在父进程中看是子进程的pid(>0),如果pid为-1说明fork出错了。
使用一个$pids数组就可以让主进程等候所有进程完结之后再结束了
希望本文所述对大家的php程序设计有所帮助。

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