php实现多进程

转：http://www.jb51.net/article/71238.htm

cd php-version/ext/pcntl
phpize

./configure && make && make install

cp /usr/lib/php/modules/pcntl.so /usr/lib64/php/modules/pcntl.so

echo "extension=pcntl.so" >> /etc/php.ini

/etc/init.d/httpd restart

<?php

header('content-type:text/html;charset=utf-8' );

// 必须加载扩展

if (!function_exists("pcntl_fork")) {

die("pcntl extention is must !");

}

//总进程的数量

$totals = 3;

// 执行的脚本数量

$cmdArr = array();

// 执行的脚本数量的数组

for ($i = 0; $i < $totals; $i++) {

$cmdArr[] = array("path" => __DIR__ . "/run.php", 'pid' =>$i ,'total' =>$totals);

}

/*

展开：$cmdArr

Array

(

[0] => Array

(

[path] => /var/www/html/company/pcntl/run.php

[pid] => 0

[total] => 3

)

[1] => Array

(

[path] => /var/www/html/company/pcntl/run.php

[pid] => 1

[total] => 3

)

[2] => Array

(

[path] => /var/www/html/company/pcntl/run.php

[pid] => 2

[total] => 3

)

)

*/

pcntl_signal(SIGCHLD, SIG_IGN); //如果父进程不关心子进程什么时候结束,子进程结束后，内核会回收。

foreach ($cmdArr as $cmd) {

$pid = pcntl_fork(); //创建子进程

//父进程和子进程都会执行下面代码

if ($pid == -1) {

//错误处理：创建子进程失败时返回-1.

die('could not fork');

} else if ($pid) {

//父进程会得到子进程号，所以这里是父进程执行的逻辑

//如果不需要阻塞进程，而又想得到子进程的退出状态，则可以注释掉pcntl_wait($status)语句，或写成：

pcntl_wait($status,WNOHANG); //等待子进程中断，防止子进程成为僵尸进程。

} else {

//子进程得到的$pid为0, 所以这里是子进程执行的逻辑。

$path = $cmd["path"];

$pid = $cmd['pid'] ;

$total = $cmd['total'] ;

echo exec("/usr/bin/php {$path} {$pid} {$total}")."\n";

exit(0) ;

}

}

?>