GUMP::validate_max_len PHP Method

    protected function validate_max_len($field, $input, $param = null)
    {
        if (!isset($input[$field])) {
            return;
        }
        if (function_exists('mb_strlen')) {
            if (mb_strlen($input[$field]) <= (int) $param) {
                return;
            }
        } else {
            if (strlen($input[$field]) <= (int) $param) {
                return;
            }
        }
        return array('field' => $field, 'value' => $input[$field], 'rule' => __FUNCTION__, 'param' => $param);
    }