original_string: public static function decode($string)
      {
          return ($string === self::NULL) ? null : strtr($string, self::$decodeMap);
      }
code: public static function decode($string)
      {
          return ($string === self::NULL) ? null : strtr($string, self::$decodeMap);
      }
code_tokens: public static function decode ( $ string ) { return ( $ string === self :: NULL ) ? null : strtr ( $ string , self :: $ decodeMap ) ; }
docstring: Decode string from server
  
  @param $string
  @return null|string
docstring_tokens: Decode string from server