Habari\InputFilter::filter PHP Метод

    public static function filter($str)
    {
        if (!MultiByte::valid_data($str)) {
            return '';
        } else {
            do {
                $_str = $str;
                $str = self::strip_nulls($str);
                $str = self::strip_illegal_entities($str);
                $str = self::filter_html_elements($str);
            } while ($str != $_str);
            return $str;
        }
    }