public static function mb_str_split($string, $length = 1)
    {
        $array = [];
        $stringLength = mb_strlen($string, 'UTF-8');
    
        for ($i = 0; $i < $stringLength; $i += $length) {
            $array[] = mb_substr($string, $i, $length, 'UTF-8');
        }
    
        return $array;
    }