Bug #80855 [Nab]: FILTER_VALIDATE_DOMAIN does not recognize emoji TLDs with FILTER_FLAG_HOSTNAME

Edit report at https://bugs.php.net/bug.php?id=80855&edit=1 ID: 80855 Updated by: requinix@php.net Reported by: vijaycs85 at gmail dot com Summary: FILTER_VALIDATE_DOMAIN does not recognize emoji TLDs with FILTER_FLAG_HOSTNAME Status: Not a bug Type: Bug Package: Filter related Operating System: OSX PHP Version: 7.4.16 Block user comment: N Private report: N New Comment: Or don't use the HOSTNAME flag. $domain_name = '⚡.kz'; $is_valid = filter_var($domain_name, FILTER_VALIDATE_DOMAIN); Previous Comments: ------------------------------------------------------------------------ [2021-03-11 20:29:30] vijaycs85 at gmail dot com Just for future reference, the below code provides the expected result. $domain_name = '⚡.kz'; $is_valid = filter_var(idn_to_ascii($domain_name), FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME); var_dump($is_valid); Output string(10) "xn--57h.kz" ------------------------------------------------------------------------ [2021-03-11 20:22:14] vijaycs85 at gmail dot com >Note that ⚡.kz must be converted to punycode, ie. xn--57h.kz. That would be considered >valid with the HOSTNAME flag. Thanks for your quick reply and clarification. ------------------------------------------------------------------------ [2021-03-11 20:10:08] requinix@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php https://www.php.net/manual/en/filter.filters.validate.php > Optional flag FILTER_FLAG_HOSTNAME adds ability to specifically validate > hostnames (they must start with an alphanumeric character and contain only > alphanumerics or hyphens). Note that ⚡.kz must be converted to punycode, ie. xn--57h.kz. That would be considered valid with the HOSTNAME flag. ------------------------------------------------------------------------ [2021-03-11 19:54:24] vijaycs85 at gmail dot com Description: ------------ There are some countries that allow Top Level Domains(TLDs) with emoji and the filter_var does not recognize them. Reference: https://tinyprojects.dev/projects/mailoji Test script: --------------- $domain_name = '⚡.kz'; $is_valid = filter_var($domain_name, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME); var_dump($is_valid); Expected result: ---------------- string(4) "⚡.kz" Actual result: -------------- bool(false) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80855&edit=1