Piwik\Plugins\Referrers\API::getWebsites PHP Method

    public function getWebsites($idSite, $period, $date, $segment = false, $expanded = false, $flat = false)
    {
        $dataTable = Archive::createDataTableFromArchive(Archiver::WEBSITES_RECORD_NAME, $idSite, $period, $date, $segment, $expanded, $flat, $idSubtable = null);
        if ($flat) {
            $dataTable->filterSubtables('Piwik\\Plugins\\Referrers\\DataTable\\Filter\\UrlsFromWebsiteId');
        } else {
            $dataTable->filter('AddSegmentByLabel', array('referrerName'));
        }
        return $dataTable;
    }