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

    public function getCampaigns($idSite, $period, $date, $segment = false, $expanded = false)
    {
        $dataTable = $this->getDataTable(Archiver::CAMPAIGNS_RECORD_NAME, $idSite, $period, $date, $segment, $expanded);
        $dataTable->filter('AddSegmentByLabel', array('referrerName'));
        $dataTable->queueFilter('PrependSegment', array('referrerType==campaign;'));
        return $dataTable;
    }