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class CUtilEx extends \CUtil{
   
   private static function mb_strtr($str, $from, $to)
   {
      return str_replace(\CUtilEx::mb_str_split($from), \CUtilEx::mb_str_split($to), $str);
   }
   private static function mb_str_split($str) {
      return preg_split('~~u', $str, null, PREG_SPLIT_NO_EMPTY);
   }
   
   private static function ToUpper($str, $lang = false)
   {
      static $lower = array();
      static $upper = array();
      if(!defined("BX_CUSTOM_TO_UPPER_FUNC"))
      {
         if(defined("BX_UTF"))
         {
            return mb_strtoupper($str);
         }
         else
         {
            if($lang === false)
               $lang = LANGUAGE_ID;
            if(!isset($lower[$lang]))
            {
               $arMsg = IncludeModuleLangFile($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/tools.php", $lang, true);
               $lower[$lang] = $arMsg["ABC_LOWER"];
               $upper[$lang] = $arMsg["ABC_UPPER"];
            }
            return mb_strtoupper(\CUtilEx::mb_strtr($str, $lower[$lang], $upper[$lang]));
         }
      }
      else
      {
         $func = BX_CUSTOM_TO_UPPER_FUNC;
         return $func($str);
      }
   }
   
   private static function ToLower($str, $lang = false)
   {
      static $lower = array();
      static $upper = array();
      if(!defined("BX_CUSTOM_TO_LOWER_FUNC"))
      {
         if(defined("BX_UTF"))
         {
            return mb_strtolower($str);
         }
         else
         {
            if($lang === false)
               $lang = LANGUAGE_ID;
            if(!isset($lower[$lang]))
            {
               $arMsg = IncludeModuleLangFile($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/tools.php", $lang, true);
               $lower[$lang] = $arMsg["ABC_LOWER"];
               $upper[$lang] = $arMsg["ABC_UPPER"];
            }
            return mb_strtolower(\CUtilEx::mb_strtr($str, $upper[$lang], $lower[$lang]));
         }
      }
      else
      {
         $func = BX_CUSTOM_TO_LOWER_FUNC;
         return $func($str);
      }
   }
   
   

   public static function translit($str, $lang, $params = array())
   {
      static $search = array();

      if(!isset($search[$lang]))
      {
         $mess = IncludeModuleLangFile($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/js_core_translit.php", $lang, true);
         $trans_from = explode(",", $mess["TRANS_FROM"]);
         $trans_to = explode(",", $mess["TRANS_TO"]);
         foreach($trans_from as $i => $from)
            $search[$lang][$from] = $trans_to[$i];
      }

      $defaultParams = array(
         "max_len" => 100,
         "change_case" => "L", // 'L' - toLower, 'U' - toUpper, false - do not change
         "replace_space" => '_',
         "replace_other" => '_',
         "delete_repeat_replace" => true,
         "safe_chars" => '',
      );
      foreach($defaultParams as $key => $value)
         if(!array_key_exists($key, $params))
            $params[$key] = $value;

      $len = mb_strlen($str);
      $str_new = '';
      $last_chr_new = '';

      for($i = 0; $i < $len; $i++)
      {
         $chr = mb_substr($str, $i, 1, "UTF-8");

         if(preg_match("/[a-zA-Z0-9]/".BX_UTF_PCRE_MODIFIER, $chr) || mb_strpos($params["safe_chars"], $chr)!==false)
         {
            $chr_new = $chr;
         }
         elseif(preg_match("/\\s/".BX_UTF_PCRE_MODIFIER, $chr))
         {
            if (
               !$params["delete_repeat_replace"]
               ||
               ($i > 0 && $last_chr_new != $params["replace_space"])
            )
               $chr_new = $params["replace_space"];
            else
               $chr_new = '';
         }
         else
         {               
            if($search[$lang][$chr])
            {
               $chr_new = $search[$lang][$chr];
            }
            else
            {
               if (
                  !$params["delete_repeat_replace"]
                  ||
                  ($i > 0 && $i != $len-1 && $last_chr_new != $params["replace_other"])
               )
                  $chr_new = $params["replace_other"];
               else
                  $chr_new = '';
            }
         }

         if(mb_strlen($chr_new))
         {
             if($params["change_case"] == "L" || $params["change_case"] == "l")
               $chr_new = \CUtilEx::ToLower($chr_new);
            elseif($params["change_case"] == "U" || $params["change_case"] == "u")
               $chr_new = \CUtilEx::ToUpper($chr_new);

            $str_new .= $chr_new;
            $last_chr_new = $chr_new;
         }

         if (mb_strlen($str_new) >= $params["max_len"])
            break;
      }
      $str_new = trim($str_new, $params['replace_space'] . $params['replace_other']);

      return $str_new;
   }
   
   
}

use \CUtilEx as CUtil;

$chr = mb_substr($str, $i, 1, "UTF-8");

$chr = mb_substr($str, $i, 1, "windows-1251");