如何利用PHP和WebSocket开发实时协作工具

class WebSocketServer {
    public function __construct($host, $port){
        $this->host = $host;
        $this->port = $port;
        $this->sockets = array();
        $this->users = array();
    }

    public function run(){
        $server = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        socket_bind($server, $this->host, $this->port);
        socket_listen($server);

        $this->sockets[] = $server;
        echo "WebSocket服务器运行在 $this->host:$this->port
";

        while(true){
            $new_sockets = $this->sockets;
            $write = NULL;
            $except = NULL;
            socket_select($new_sockets, $write, $except, NULL);
            foreach($new_sockets as $socket){
                if ($socket == $server){
                    $client = socket_accept($server);
                    $this->sockets[] = $client;
                    $this->users[] = array('socket'=>$client);
                } else {
                    $bytes = @socket_recv($socket, $buffer, 1024, MSG_DONTWaiT);
                    if ($bytes == 0) {
                        $index = $this->find_user_by_socket($socket);
                        if ($index >= 0) {
                            array_splice($this->users, $index, 1);
                        }
                        socket_close($socket);
                        $key = array_search($socket, $this->sockets);
                        array_splice($this->sockets, $key, 1);
                    } else {
                        $index = $this->find_user_by_socket($socket);
                        if($index >= 0) {
                            $msg = $buffer;
                            $this->handle_message($msg, $this->users[$index]);
                        }
                    }
                }
            }
        }
    }

    private function find_user_by_socket($socket){
        $found = -1;
        foreach($this->users as $index => $user){
            if ($user['socket'] == $socket){
                $found = $index;
                break;
            }
        }
        return $found;
    }

    private function handle_message($msg, $user) {
        // 处理新消息
    }
}

private function handle_message($msg, $user) {
    if(strlen($msg) === 0) {
        return;
    }

    $code = ord(substr($msg, 0, 1)) & 0x0F;
    switch ($code){
        case 0x01: // 文本数据
            $msg = substr($msg, 1);
            break;
        case 0x02: // 二进制数据
            $msg = substr($msg, 1);
            break;
        case 0x08: // 连接关闭
            $index = $this->find_user_by_socket($user['socket']);
            if ($index >= 0) {
                array_splice($this->users, $index, 1);
            }
            socket_close($user['socket']);
            $key = array_search($user['socket'], $this->sockets);
            array_splice($this->sockets, $key, 1);
            return;
        case 0x09: // ping
        case 0x0A: // pong
            return;
        default:
            return;
    }

    // 处理新消息
}

var ws = new WebSocket("ws://localhost:8080/");
ws.onopen = function() {
    console.log("Connected to WebSocket server");
};

ws.onmessage = function(evt) {
    console.log("Received message: " + evt.data);
};

ws.onclose = function(evt) {
    console.log("Disconnected from WebSocket server");
};

ws.send("Hello, WebSocket server!");

class WebSocketChat {

    private $users = array();

    public function onOpen($user){
        $this->users[$user['id']] = $user;
        $this->sendToAll(array('type'=>'notice','from'=>'System','msg'=>"{$user['name']}进入聊天室"));
    }

    public function onMessage($user, $msg){
        $this->sendToAll(array('type'=>'msg','from'=>$user['name'],'msg'=>$msg));
    }

    public function onClose($user){
        unset($this->users[$user['id']]);
        $this->sendToAll(array('type'=>'notice','from'=>'System','msg'=>"{$user['name']}离开聊天室"));
    }

    private function sendToAll($msg){
        foreach($this->users as $user){
            $this->send($user, $msg);
        }
    }

    private function send($user, $msg){
        socket_write($user['socket'], $this->encode(JSON_encode($msg)));
    }

    private function encode($msg){
        $len = strlen($msg);
        if($len <= 125){

        }

        if($len <= 65535){

        }


    }
}