App\Controllers\Admin\BaseController::getFields PHP Method

    protected function getFields(array $arFields, $arSave = array(), $arHide = array())
    {
        $arHide = array_merge($arHide, array('id', 'created_at', 'updated_at'));
        return array_diff($arFields, array_diff($arHide, $arSave));
    }