This proposal is strrev for grapheme cluster unit function. User land 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().
Add grapheme_strrev function.
<?php echo grapheme_strrev("αあいうえお👨👨👧👦"); // result is "👨👨👧👦おえういあα" ?>
This could break a function existing in userland with the same name.
Next of PHP 8.5 (PHP 8.6 or PHP 9.0)
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