php多进程编程

// 建议php5.3以上，代码中自行调用pcntl_signal_dispatch();

if (!function_exists("pcntl_signal_dispatch")) {

    declare(ticks=1);

}

pcntl_signal(SIGCHLD, SIG_IGN); // 注册信号处理函数  如果父进程不关心子进程什么时候结束,设为SIG_IGN, 子进程结束后，内核会回收，并不再给父进程发送信号

$child_pids = [];

for ($i = 0; $i<3; $i++) {

    $child_pid = pcntl_fork();

    switch ($child_pid) {

        case -1:

            exit('fork fail!');

            break;

        case 0:

            echo '子进程开始，PID:' . getmypid() . PHP_EOL;

            sleep(rand(1,5));

            echo '子进程结束，PID:' . getmypid() . PHP_EOL;

            exit();

            break;

        default:

            $child_pids[] = $child_pid;

            echo '父进程-runing，PID:' . getmypid() . PHP_EOL;

            break;

    }

}

while (count($child_pids)) {

    if (!function_exists("pcntl_signal_dispatch")) {

        pcntl_signal_dispatch();

    }

    foreach ($child_pids as $key => $child_pid) {

        //$res = pcntl_wait($status, WNOHANG);

        $res = pcntl_waitpid($child_pid, $status, WNOHANG);

        if ($res == -1 || $res > 0) {

            echo '子进程退出, PID:' . $child_pid . PHP_EOL;

            unset($child_pids[$key]);

        } else {

            usleep(500000);

            echo 'WAIT' . PHP_EOL;

        }

}

}

echo '父进程退出' . PHP_EOL;

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