PHP: rfc:deprecate-and-remove-intl_idna_variant_2003

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====== PHP RFC: Deprecate and remove INTL_IDNA_VARIANT_2003 ======
  * Version: 1.1
  * Date: 2017-01-07
  * Author: Christoph M. Becker, cmb@php.net
  * Status: Implemented
  * First Published at: http://wiki.php.net/rfc/deprecate-and-remove-intl_idna_variant_2003

===== Introduction =====

As of ICU 55.1 (released 2015-04-01) the [[http://source.icu-project.org/repos/icu/icu/tags/release-55-1/APIChangeReport.html#deprecated|IDNA2003 APIs are deprecated]], because [[https://sourceforge.net/p/icu/mailman/message/32980778/|UTS #46 should be preferred over the obsolete IDNA 2003 variant]]. However, the intl extension still uses INTL_IDNA_VARIANT_2003 as default for [[http://php.net/manual/en/function.idn-to-ascii.php|idn_to_ascii()]] and [[http://php.net/manual/en/function.idn-to-utf8.php|idn_to_utf8()]], which should be changed as soon as possible.

===== Proposal =====

Therefore I suggest the following procedure:

  * //PHP 7.2//: deprecate INTL_IDNA_VARIANT_2003
  * //PHP 7.4//: change the default of idn_to_ascii()'s and idn_to_utf8()'s $variant parameter to INTL_IDNA_VARIANT_UTS46
  * //PHP 8.0//: remove support for INTL_IDNA_VARIANT_2003 altogether

===== Backward Incompatible Changes =====

Obviously, code explicitly using INTL_IDNA_VARIANT_2003 would break (during PHP 7 only with regard to triggering a deprecation notice), and code relying on the default variant might break (however, it might be "magically" fixed as well).

===== RFC Impact =====

Besides the obvious behavioral changes to idn_to_ascii() an idn_to_utf8() there is no further impact on SAPIs, extensions or OPcache.

===== Open Issues =====

None.

===== Proposed Voting Choices =====

Whether to implement the proposal above, or not.

This RFC requires a 2/3 majority. Voting starts on 2017-01-31T12:30Z and ends on 2017-02-14T12:30Z.

<doodle title="Deprecate and remove INTL_IDNA_VARIANT_2003" auth="cmb" voteType="single" closed="true">
   * Yes
   * No
</doodle>

===== Patches and Tests =====

[[https://github.com/php/php-src/pull/2355|PR implementing the deprecation]].

===== Implementation =====

  - PR #2355 has been merged into master (which is supposed to become PHP-7.2) with [[https://github.com/php/php-src/commit/6cfbb7f9bd4576f8f6172a33d49e7498b3b617e1|commit 6cfbb7f9]].
  - The PHP manual has been [[http://svn.php.net/viewvc?view=revision&revision=341894|updated]]. The migration guide will be written based on UPGRADING, which already has a respective note.
  - [[http://git.php.net/?p=php-src.git;a=commit;h=3d15a6f86b56c8acbf7363fb5e70a054918dbd64|Removed for PHP 8]]

===== References =====

  * [[http://marc.info/?t=148001209500002&r=1&w=2|First introduction on internals]]
  * [[http://marc.info/?t=148379802600002&r=1&w=2|Discussion thread on internals]]

===== Rejected Features =====

None.
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