Hprose\Service::sendError PHP Method

    function sendError($error, stdClass $context)
    {
        if (is_string($error)) {
            $error = new Exception($error);
        }
        try {
            if ($this->onSendError !== null) {
                $onSendError = $this->onSendError;
                $e = call_user_func_array($onSendError, array(&$error, $context));
                if ($e instanceof Exception || $e instanceof Throwable) {
                    $error = $e;
                }
            }
        } catch (Exception $e) {
            $error = $e;
        }
        $stream = new BytesIO();
        $writer = new Writer($stream, true);
        $stream->write(Tags::TagError);
        $writer->writeString($this->debug ? $error->getTraceAsString() : $error->getMessage());
        return $stream;
    }