PHP pcntl_exec 调用多个子进程并行执行，主进程等待全部子进程完成示例

主程序

<?PHP
$childs = array();

$cmds=array(
        array('/root/sub.PHP','120'),array('/root/sub.PHP','120')
);

echo 'begin';
echo date("Y-m-d H:i:s");

foreach($cmds as $cmd){
        $pid=pcntl_fork();
        if($pid==-1){ //进程创建失败
                die('fork child process failure!');
        }
        else if($pid){ //父进程处理逻辑
                $childs[] = $pid;
                pcntl_wait($status,WNOHANG);
        }
        else{ //子进程处理逻辑
                pcntl_exec('/usr/bin/PHP',$cmd);
        }
}
while (count($childs) > 0) {
    foreach ($childs as $key => $pid) {
        $res = pcntl_waitpid($pid,$status,WNOHANG);

//-1代表error,大于0代表子进程已退出,返回的是子进程的pid,非阻塞时0代表没取到退出子进程
        if ($res == -1 || $res > 0)
            unset($childs[$key]);
    }

    sleep(1);
}

echo date("Y-m-d H:i:s");
echo 'done';
?>

子程序

<?PHP

echo $argv[1];
sleep ($argv[1]);
?>