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

    public function getNumberOfDistinctWebsites($idSite, $period, $date, $segment = false)
    {
        return $this->getNumeric(Archiver::METRIC_DISTINCT_WEBSITE_RECORD_NAME, $idSite, $period, $date, $segment);
    }