问如何在不使用javascript的情况下，通过后台后台和websocket实现对实时firebase数据库的监听，动态获取数据

EN

    public function onMessage(ConnectionInterface $conn, $msg)
    {
        echo $msg;
        // $data = json_decode($msg);
        $payload = json_decode($msg);
        if (method_exists($this, $method = 'handle' . ucfirst($payload->event))) {
            $this->{$method}($connection, $payload);
        }

        // if (isset($data->command)) {
        //     // $user = $this->users[$conn->resourceId];

        //     $message = $payload->data;

        // }
    }