/** * @return Pap_Tracking_Common_VisitorAffiliateCollection */ public static function sortVisitorAffiliatesByDateVisit(Pap_Tracking_Common_VisitorAffiliateCollection $visitorAffiliates) { $visitorAffiliates->sort(array("Pap_Tracking_Visit_VisitorAffiliateCache", "compareTwoVisitorAffiliateByDateVisit")); }