分享PHP-pcntl 实现多进程代码
作者：zhaoyingnan911
PHP可通过PCNTL扩展实现进程控制，如进程创建，信号处理，进程中断判断等。但只能在CLI模式下操作。PCNTL的信号机制是基于 ticks 机制实现的。
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