A small server handel tcp request 一个非常小的服务器，用来监听TCP请求

small-server.php

<?php

set_time_limit(0); // 无限制的跑下去，跑到天荒地老

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// 绑定地址和端口
if (!socket_bind($socket, $config['tcp.host'], $config['tcp.port'])) {
    die('socket bind fail');
}

// 开始监听
if (!socket_listen($socket)) {
    die('socket lisen fail');
}

// 这就是我要做一辈子的工作
while (true) {
    
    //看看这里有啥要做的么，没有就循环
    if (($skt = socket_accept($socket)) === false) {
        continue;
    }

    // fork a child to run service
    $pid = pcntl_fork();
    if ($pid == 0) {
        // "I am child";
        // will do the job
        socket_close($socket);
    } else {
        // "I am father";
        // will wait for another request
        continue;
    }

    // ... do something with request
    
    socket_close($skt);

    // 子进程自杀
    exit;
}