code: public static function convertEncoding($value, $to, $from)
      {
          if (self::getIsIconvEnabled()) {
              $result = iconv($from, $to . '//IGNORE//TRANSLIT', $value);
              if (false !== $result) {
                  return $result;
              }
          }
  
          return mb_convert_encoding($value, $to, $from);
      }
docs: Convert string from one encoding to another.
  
  @param string $value
  @param string $to Encoding to convert to, e.g. 'UTF-8'
  @param string $from Encoding to convert from, e.g. 'UTF-16LE'
  
  @return string