LibCloud\Dns\Providers\TransIP\TransIPProvider::getZone PHP Method

    public function getZone($zoneDomain = null)
    {
        if (!is_null($zoneDomain)) {
            $zoneDomain = strtolower($zoneDomain);
            $domainList = Transip_DomainService::getDomainNames();
            foreach ($domainList as $k => $v) {
                if (strtolower($v) == $zoneDomain) {
                    return $this->toZone(["domainId" => $k, "domain" => $v]);
                }
            }
        }
        return false;
    }