分享PHP-pcntl 实现多进程代码

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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.PHP实战

下面我们来看个实例PHP实战

代码
PHP实战

<?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
PHP实战

* Process 16163 was created,and Sleep 11
* Process 16164 was created,and Sleep 21
* Process 16165 was created,and Sleep 24
* Process 16166 was created,and Sleep 27
* Process 16167 was created,and Sleep 8
* Process 16168 was created,and Sleep 14
* Process 16169 was created,and Sleep 14
* Process 16170 was created,and Sleep 26
* Process 16171 was created,and Sleep 20
* Process 16172 was created,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