[wp-trac] [WordPress Trac] #19724: Sites with IDN domains can't be created (bug #15554 continuation)

[WordPress Trac]

#19724: Sites with IDN domains can't be created (bug #15554 continuation)
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 Reporter:  qdinar              |       Owner:  (none)
     Type:  defect (bug)        |      Status:  new
 Priority:  normal              |   Milestone:
Component:  Networks and Sites  |     Version:  3.3
 Severity:  normal              |  Resolution:
 Keywords:  needs-patch         |     Focuses:  multisite
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Comment (by realloc):

 The original issue is still valid for user signups, although it’s now
 limited in scope.

 Given modern PHP requirements and the widespread availability of
 [https://www.php.net/manual/en/ref.intl.idn.php IDN functions], the
 suggested use of a third-party library is no longer needed.

 In subdomain-based networks (e.g. bücher.example.com), allowing Unicode
 input makes sense and can be normalized to punycode during submission. For
 subdirectory-based setups (e.g. example.com/bücher), support would require
 broader changes to core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/19724#comment:14>
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