Piwik\Plugins\UserCountry\Columns\Country::getCountryUsingProviderExtensionIfValid PHP Method

    private function getCountryUsingProviderExtensionIfValid($ipAddress)
    {
        if (!Manager::getInstance()->isPluginInstalled('Provider')) {
            return false;
        }
        $hostname = $this->getHost($ipAddress);
        $hostnameExtension = ProviderProvider::getCleanHostname($hostname);
        $hostnameDomain = substr($hostnameExtension, 1 + strrpos($hostnameExtension, '.'));
        if ($hostnameDomain == 'uk') {
            $hostnameDomain = 'gb';
        }
        /** @var RegionDataProvider $regionDataProvider */
        $regionDataProvider = StaticContainer::get('Piwik\\Intl\\Data\\Provider\\RegionDataProvider');
        if (array_key_exists($hostnameDomain, $regionDataProvider->getCountryList())) {
            return $hostnameDomain;
        }
        return false;
    }