Gc\User\Visitor::getVisitorId PHP Method

    public function getVisitorId($sessionId)
    {
        $urlId = $this->getUrlId($this->getRequestUri(), $this->getReferer());
        $select = new Select();
        $select->from(array('lv' => $this->name))->columns(array('id'))->where->equalTo('session_id', $sessionId)->equalTo('http_user_agent', $this->getUserAgent())->equalTo('remote_addr', $this->getRemoteAddr());
        $visitorId = $this->fetchOne($select);
        if (empty($visitorId)) {
            $insert = new Insert();
            $insert->into('log_visitor')->values(array('session_id' => $sessionId, 'http_user_agent' => $this->getUserAgent(), 'http_accept_charset' => $this->getAcceptCharset(), 'http_accept_language' => $this->getAcceptLanguage(), 'server_addr' => $this->getServerAddr(), 'remote_addr' => $this->getRemoteAddr()));
            $this->execute($insert);
            $visitorId = $this->getLastInsertId('log_visitor');
        }
        $insert = new Insert();
        $insert->into('log_url')->values(array('visit_at' => new Expression('NOW()'), 'log_url_info_id' => $urlId, 'log_visitor_id' => $visitorId));
        $this->execute($insert);
        return $visitorId;
    }

 /**
  * Log visitor informations
  *
  * @param boolean $isPreview Is the current page is a preview
  * @param boolean $isAdmin   Is an admin is connected
  *
  * @return void
  */
 protected function logVisitor($isPreview, $isAdmin)
 {
     if (!$isPreview and !$isAdmin) {
         try {
             $visitor = new Visitor();
             $session = new SessionContainer();
             $sessionId = $session->getDefaultManager()->getId();
             $session->visitorId = $visitor->getVisitorId($sessionId);
         } catch (Exception $e) {
             //don't care
         }
     }
 }