public function index(Request $request)

    {

        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。 

        $max = 8000;

        $workers = 10;

        $pids = array();

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

            $pids[$i] = pcntl_fork();

            $pid = posix_getpid();

            switch ($pids[$i]) {

                case -1:

                    echo "fork error : {$i} \r\n";

                    exit;

                case 0:

                    $param = array(

                        'lastid' => $max / $workers * $i,

                        'maxid' => $max / $workers * ($i+1),

                    );

                    $this->doSomething($pid, $param);

                    exit;

                default:

                    break;

            }

        }

        foreach ($pids as $i => $pid) {

            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。

                //pcntl_waitpid($pid, $status);

            }

        }

    }

// 可以看到那个子进程在处理哪些数据

    public function doSomething($filename, $param)

    {

        for ($i = $param['lastid']; $i < $param['maxid']; $i++) {

            $path = "./test/";

            if (!is_dir($path)){

                mkdir($path, 0777, true);

            }

            $content = $i . '|';

            $file = $path . $filename . ".txt";

            file_put_contents($file, $content, FILE_APPEND);

        }

    }