Add grapheme_str_split function

I noticed that PHP does not have a grapheme cluster based str_split function.
So I created the grapheme_str_split function.

This feature will all

Add grapheme_str_split function

I noticed that PHP does not have a grapheme cluster based str_split function.
So I created the grapheme_str_split function.

This feature will allow you to correctly handle emoji
and variable selectors.

Co-authored-by: Ayesh Karunaratne <Ayesh@users.noreply.github.com>

Close GH-13580

show more ...