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