message: Change from_id in disconnect to -1 to represent the connection is closed by server
diff: @@ -619,7 +619,7 @@ static PHP_METHOD(swoole_websocket_server, disconnect)
  swEventData req;
  req.info.fd = fd;
  req.info.len = swoole_http_buffer->length;
  - req.info.from_id = conn->from_id;
  + req.info.from_id = -1;
  req.info.from_fd = conn->from_fd;
  memcpy(&req.data, swoole_http_buffer->str, swoole_http_buffer->length);
  