LaravelFCM\Response\DownstreamResponse::needToBeDeleted PHP Method

    private function needToBeDeleted($index, $result)
    {
        if (array_key_exists(self::ERROR, $result) && (in_array(self::NOT_REGISTERED, $result) || in_array(self::INVALID_REGISTRATION, $result))) {
            if ($this->tokens[$index]) {
                $this->tokensToDelete[] = $this->tokens[$index];
            }
            return true;
        }
        return false;
    }