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
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