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}")." ";
exit(0) ;
}
}
?>