function strToUtf8($str)
 {
  $chars = unpack('C*', $str);
  $cnt = count($chars);
  for ($i=1; $i<=$cnt; $i++)
  {
   $this->_charToUtf8($chars[$i]);
  }
  return implode("",$chars);
 }

 function strToUtf8($str)
 {
  return $str;
 }