private function getRefererId()
    {
        return $this->trackIfEnabled('referers', function () {
            return $this->getRefererTracker()->track(
                $this->request->headers->get('referer'),
                $this->request->url()
            );
        });
    }
private function getRefererId()
    {
        return $this->trackIfEnabled('referers', function () {
            return $this->getRefererTracker()->track(
                $this->request->headers->get('referer'),
                $this->request->url()
            );
        });
    }
private function getRefererId ( ) { return $ this -> trackIfEnabled ( 'referers' , function ( ) { return $ this -> getRefererTracker ( ) -> track ( $ this -> request -> headers -> get ( 'referer' ) , $ this -> request -> url ( ) ) ; } ) ; }
Get the tracked referer id.

@return int|null
Get the tracked referer id .