DmitryDulepov\Realurl\Configuration\ConfigurationReader::setHostnamesForEncoding PHP Method

    protected function setHostnamesForEncoding()
    {
        if ($GLOBALS['TSFE']->config['config']['typolinkEnableLinksAcrossDomains']) {
            // We have to find proper domain for the id.
            $pageRepository = $GLOBALS['TSFE']->sys_page;
            /** @var \TYPO3\CMS\Frontend\Page\PageRepository $pageRepository */
            $id = $this->urlParameters['id'];
            if (!MathUtility::canBeInterpretedAsInteger($id)) {
                $id = $pageRepository->getPageIdFromAlias($this->urlParameters['id']);
            }
            $MP = isset($this->urlParameters['MP']) ? $this->urlParameters['MP'] : '';
            $rootline = $pageRepository->getRootLine($id, $MP);
            $globalConfig =& $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['realurl'];
            foreach ($rootline as $page) {
                foreach ($globalConfig as $domainName => $configuration) {
                    if ($domainName !== '_DOMAINS' && is_array($configuration) && isset($configuration['pagePath']) && is_array($configuration['pagePath']) && isset($configuration['pagePath']['rootpage_id'])) {
                        if ((int) $configuration['pagePath']['rootpage_id'] === (int) $page['uid']) {
                            $this->hostName = $domainName;
                            break 2;
                        }
                    }
                }
            }
        }
        if (empty($this->hostName)) {
            $this->alternativeHostName = $this->hostName = $this->utility->getCurrentHost();
        }
    }