Sites with IDN domains can't be created (bug #15554 continuation)

[qdinar]

registration of new site with idn domain by unknown/new users themselves is not possible.
(though creation of new site in wp-admin/network/site-new.php page is possible, by patch given in bug #15554 , i have just now tested it.)

also let i mention that site domain is written (and would be requested to enter, if would be fixed without punycode to unicode conversion) in punicode form in wp-signup.php page, that is not acceptable for wordpress.

i have attached differences i made to wp 3.0.4 to make idn domains working and also to show and accept them in human readable format in wp-signup.php page . link to the differences file i attached to/in previous bug report on/to this topic: http://core.trac.wordpress.org/attachment/ticket/15554/diff304-blogo.txt .

See ​http://codex.wordpress.org/Reporting_Bugs#Trac_Keywords

i would change "component" from "general" to I18N or Multisite.

i am now going to make same changes as in the "diff" to v. 3.3 .

i [will] attach differences [i] made to v 3.3.
but this do not work at my installation, i have segfault and premature end of script headers errors.

idn.default_charset=UTF-8
php option to make php5-idn working.

i will attach same [my] diff in correct ("unified") format, i could not patch my old diff, so read about diff and patch usage. i hope this diff will be highlited in this site.

​idn_to_utf8 (idn_to_unicode) and ​idn_to_ascii are only available in PHP 5.3 and the intl PECL library, so those would need drop-in compatibility functions I believe.

Related: #20019