grapheme_strrev: strrev for grapheme cluster View as Markdown

Introduction

This proposal is strrev for grapheme cluster unit function. Userland sometimes shows mb_strrev function, but mbstring(Unicode code point unit) can not support multi code point (for example, emoji etc...).

Almost same of Swift's String.reversed().

Proposal

Add grapheme_strrev function.

<?php
echo grapheme_strrev("αあいうえお👨‍👨‍👧‍👦"); // result is "👨‍👨‍👧‍👦おえういあα"
echo grapheme_strrev("ﻡﺮﺤﺑًﺍ"); // result is "ﺍً ﺐﺣﺮﻣ" (Hello in Arabic, Also works RtoL languages)
?>

Backward Incompatible Changes

This could break a function existing in userland with the same name.

Proposed PHP Version(s)

Next of PHP 8.5 (PHP 8.6 or PHP 9.0)

RFC Impact

To the Ecosystem

None

To Existing Extensions

Adds grapheme_strrev() to the intl extension.

To SAPIs

None

Open Issues

None

Future Scope

None

Voting Choices

Pick a title that reflects the concrete choice people will vote on.

Please consult the php/policies repository for the current voting guidelines.

Primary Vote requiring a 2/3 majority to accept the RFC:

Vote: Add grapheme_strrev function — Yes: 20 · No: 0 · Abstain: 0 (closed)

Patches and Tests

• https://github.com/php/php-src/pull/20949

Implementation

After the RFC is implemented, this section should contain:

1. the version(s) it was merged into
2. a link to the git commit(s)
3. a link to the PHP manual entry for the feature

References

• https://news-web.php.net/php.internals/129765
• https://news-web.php.net/php.internals/130023

Rejected Features

Keep this updated with features that were discussed on the mail lists.

Changelog

If there are major changes to the initial proposal, please include a short summary with a date or a link to the mailing list announcement here, as not everyone has access to the wikis' version history.