Str\Grapheme\reverse() function

[yivi]

Add Str\Grapheme\reverse() to match Str\reverse() and Str\Byte\reverse()

[coveralls]

Pull Request Test Coverage Report for Build 1356158078

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.0001%) to 99.936%

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Totals
Change from base Build 1355021051:	0.0001%
Covered Lines:	3130
Relevant Lines:	3132

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💛 - Coveralls

[yivi]

Regarding the coverage decrease... I'm afraid I do not yet know how to produce an input that grapheme_strlen would choke on.

Docs (https://www.php.net/manual/en/function.grapheme-strlen.php) say the function returns int|false|null with false and on failure (?) and, with no indication of when null would be returned.

I'm trying to see how to create a string that would be an invalid UTF-8 string to see if we can recover the lost coverage.

[yivi]

Ok, got it. Pushing recovered coverage. :)

[azjezz]

Thank you @yivi 🎉