PHP reference

mb_str_split

Splits a string into characters for any alphabet.

Syntax

mb_str_split(string $string, int $length = 1, ?string $encoding = null): array

Parameter	Type	Description
$string	string	The source string.
$length	int	Optional. How many characters go into each piece.
$encoding	?string	Optional. The encoding; UTF-8 by default.

arrayAn array of characters or groups of characters.

Cyrillic letters:

<?php
 
echo implode(' ', mb_str_split('кот'));

Output:

к о т

Reversing a string in any language:

<?php
 
echo implode('', array_reverse(mb_str_split('привет')));

Output:

тевирп

The function appeared in PHP 7.4. Plain strrev() produces garbage for non-ASCII text — reverse with mb_str_split() instead.

Strings — Working with strings in PHP — quotes, concatenation, length, searching, replacing and multibyte functions.