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

    public function getKeywordsFromCampaignId($idSite, $period, $date, $idSubtable, $segment = false)
    {
        $campaigns = $this->getCampaigns($idSite, $period, $date, $segment);
        $campaigns->applyQueuedFilters();
        $campaign = $campaigns->getRowFromIdSubDataTable($idSubtable)->getColumn('label');
        $dataTable = $this->getDataTable(Archiver::CAMPAIGNS_RECORD_NAME, $idSite, $period, $date, $segment, $expanded = false, $idSubtable);
        $dataTable->filter('AddSegmentByLabel', array('referrerKeyword'));
        $dataTable->queueFilter('PrependSegment', array('referrerName==' . $campaign . ';referrerType==campaign;'));
        return $dataTable;
    }