GUMP::validate_required PHP Метод

    protected function validate_required($field, $input, $param = null)
    {
        if (isset($input[$field]) && ($input[$field] === false || $input[$field] === 0 || $input[$field] === 0.0 || $input[$field] === '0' || !empty($input[$field]))) {
            return;
        }
        return array('field' => $field, 'value' => null, 'rule' => __FUNCTION__, 'param' => $param);
    }