Introduction to the usage of PHP's Pcntl multi-process extension

This article brings you an introduction to the usage of PHP's Pcntl multi-process extension. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

PHP provides a Pcntl extension. Pcntl is based on the Linux process. Windows systems do not have this extension for the time being. It is used to implement basic multi-process implementation. You can use this to handle a time-consuming task, such as sending subscription emails. , text messages, site messages, etc.

Sample code:

The code is based on the Laravel framework. It is recommended to use this framework to allow this part of the code.

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(

                        &#39;lastid&#39; => $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);
        }
    }

More suggestions are to read documents, processes and threads, there is a lot of content, you need to read and learn

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