回答

<?php

$serv = new swoole_server('0.0.0.0', 9911, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);
$serv->set(array(
    'worker_num' => 4,
    'daemonize' => false,
    'backlog' => 128,
));

$serv->on('Connect', 'onConnect');
$serv->on('Receive', 'onReceive');
$serv->on('Close', 'onClose');

$serv->start();

/**
*Http建立连接回调函数
*/
function onConnect($serv, $fd) {
    echo "Server is running on 0.0.0.0:9911".PHP_EOL;
}

/**
* 开始接受客户端信息回调函数
*/
function onReceive($serv, $fd, $from_id, $data) {
    $_username = request($serv, $fd, $data, "username");
    $_password = request($serv, $fd, $data, "password");
    response($serv, $fd, json_encode(["youname" => $_username]));
}

/**
* 连接关闭后回调函数
*/
function onClose($serv, $fd) {
    return false;
}

/**
* 封装response 的内容
*/
function response($serv, $fd, $res_data = '') {

    //响应行
    $response = array(
        'HTTP/1.1 200',
    );
    //响应头
    $headers = array(
        'Server' => 'SwooleServer',
        'Content-Type' => 'text/json;charset=utf8',
        'Content-Length' => strlen($res_data),
    );
    foreach ($headers as $key => $val) {
        $response[] = $key.':'.$val;
    }
    //空行
    $response[] = '';
    //响应体
    $response[] = $res_data;
    $send_data = join("\r\n", $response);
    $serv->send($fd, $send_data);
}

function request($serv, $fd, $data, $key) {
    $tmp_data = explode("\r\n", $data);
    if (!is_array($tmp_data) || empty($tmp_data)) return false;
    $request_info = explode(" ", $tmp_data[0]);
    if (!is_array($request_info) || empty($request_info)) return false;

    switch ($request_info[0]) {
        case 'GET':
            $tmp_str = urldecode($request_info[1]);

            $query_info = parse_url($tmp_str);
            $_path = isset($query_info['path'])?$query_info['path']:"";
            $_query = isset($query_info['query'])?$query_info['query']:"";
            $params = [];
            if ($_query != "") {
                $queryParts = explode('&', $_query);
                $params = array();
                foreach ($queryParts as $param) {
                    $item = explode('=', $param);
                    $params[$item[0]] = $item[1];
                }
              
            }

            if (isset($params[$key])) {
                return $params[$key];
            } else {
                return  "";
            }



            break;
        case 'POST':

            break;
        default:
            return false;
            break;
    }
}