public static function register($data = [])
 {
     if (self::checkValues($data)) {
         UsersDB::insertCustomer($data);
     } else {
         self::registration();
     }
 }
 public static function addUser($data = [])
 {
     if (self::checkValues($data)) {
         $id = UsersDB::insertCustomer($data);
         self::addActionToDiary($_SESSION["id"], "Prodajalec z id-jem " . $_SESSION["id"] . " je dodal stranko z id-jem " . $id);
         echo ViewHelper::redirect(BASE_URL . "users");
     } else {
         self::addUserForm();
     }
 }