PHP RFC: grapheme_strrev: strrev for grapheme cluster
- Version: 0.9
- Date: 2026-01-14
- Author: Yuya Hamada youkidearitai@gmail.com
- Status: Under Discussion
- Implementation: https://github.com/php/php-src/pull/20949
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
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Primary Vote requiring a 2/3 majority to accept the RFC:
Patches and Tests
Implementation
After the RFC is implemented, this section should contain:
- the version(s) it was merged into
- a link to the git commit(s)
- a link to the PHP manual entry for the feature
References
Rejected Features
Keep this updated with features that were discussed on the mail lists.
Changelog
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