Share PHP-pcntl to implement multi-process code

PHP can also process a transaction using multiple processes using the PCNTL series of functions. For example, I need to obtain 800,000 pieces of data from the database and then perform a series of subsequent processing. At this time, use a single process? You can wait until today next year. . . So you should use the pcntl function.

Let’s take a look at an example

Code

<?php
$arChildId = array();
 
for($i = 0; $i < 10; $i++)
{
$iPid = pcntl_fork();
if($iPid == -1)
{
  die(&#39;can\&#39;t be forked.&#39;);
}
 
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 &#39;* Process &#39;. $iPid. &#39; was created, and Executed, and Sleep &#39;. $iSeconds. PHP_EOL;
  excuteProcess($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 &#39;* Sub process: &#39;. $iPid. &#39; exited with &#39;. $status. PHP_EOL;
  }
}
}
 
# 子进程执行的逻辑
function excuteProcess($iPid, $iSeconds)
{
file_put_contents(&#39;./log/&#39;.$iPid.&#39;.log&#39;, $iPid.PHP_EOL, FILE_APPEND);
sleep($iSeconds);
}
?>

Running results

* 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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