Neos\Neos\Controller\Module\Administration\SitesController::indexAction PHP Method

    public function indexAction()
    {
        $sitePackagesAndSites = array();
        foreach ($this->packageManager->getFilteredPackages('available', null, 'neos-site') as $sitePackageKey => $sitePackage) {
            /** @var PackageInterface $sitePackage */
            $sitePackagesAndSites[strtolower(str_replace('.', '_', $sitePackageKey))] = array('package' => $sitePackage, 'packageKey' => $sitePackage->getPackageKey(), 'packageIsActive' => $this->packageManager->isPackageActive($sitePackage->getPackageKey()));
        }
        $sites = $this->siteRepository->findAll();
        foreach ($sites as $site) {
            $siteResourcePackageKey = strtolower(str_replace('.', '_', $site->getSiteResourcesPackageKey()));
            if (!isset($sitePackagesAndSites[$siteResourcePackageKey])) {
                $sitePackagesAndSites[$siteResourcePackageKey] = array('packageKey' => $site->getSiteResourcesPackageKey());
            }
            if (!isset($sitePackagesAndSites[$siteResourcePackageKey]['sites'])) {
                $sitePackagesAndSites[$siteResourcePackageKey]['sites'] = array();
            }
            $sitePackagesAndSites[$siteResourcePackageKey]['sites'][] = $site;
        }
        $this->view->assignMultiple(array('sitePackagesAndSites' => $sitePackagesAndSites, 'multipleSites' => count($sites) > 1));
    }