function getLinkedCampaignNames() { $campaignNames = array(); $dbr = wfGetDB(DB_SLAVE); $res = $dbr->select('pr_adlinks', 'cmp_id', array('ad_id' => $this->getId())); foreach ($res as $row) { $campaignNames[] = AdCampaign::getCampaignName($row->cmp_id); } return $campaignNames; }