If you need to work with Cyrillic text in PHP, you may notice that functions that are related to case sensitivity are not working as expected. What do i mean - strtolower, strtouper, ucwords, and so on.
So if you want to get the expected result you need to use mb_convert functions.
Here is the example:
$string = "Хелоу";
$string = mb_convert_case($string, MB_CASE_LOWER, "UTF-8");
echo $string;
//output is: хелоу
?>
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