<? 

   define('LOWERCASE',3); 

   define('UPPERCASE',1); 

   function detect_cyr_charset($str) { 

      $charsets = Array( 

         'k' => 0, 

         'w' => 0, 

         'd' => 0, 

         'i' => 0, 

         'm' => 0 

      ); 

      for ( $i = 0, $length = strlen($str); $i < $length; $i++ ) { 

         $char = ord($str[$i]); 

      //non-russian characters 

      if ($char < 128 || $char > 256) continue; 

      //CP866 

      if (($char > 159 && $char < 176) || ($char > 223 && $char < 242)) 

         $charsets['d']+=LOWERCASE; 

      if (($char > 127 && $char < 160)) $charsets['d']+=UPPERCASE; 

      //KOI8-R 

      if (($char > 191 && $char < 223)) $charsets['k']+=LOWERCASE; 

      if (($char > 222 && $char < 256)) $charsets['k']+=UPPERCASE; 

      //WIN-1251 

      if ($char > 223 && $char < 256) $charsets['w']+=LOWERCASE; 

      if ($char > 191 && $char < 224) $charsets['w']+=UPPERCASE; 

      //MAC 

      if ($char > 221 && $char < 255) $charsets['m']+=LOWERCASE; 

      if ($char > 127 && $char < 160) $charsets['m']+=UPPERCASE; 

      //ISO-8859-5 

      if ($char > 207 && $char < 240) $charsets['i']+=LOWERCASE; 

      if ($char > 175 && $char < 208) $charsets['i']+=UPPERCASE; 

   } 

   arsort($charsets); 

   return key($charsets); 

}