src/Guzzle/Http/QueryString.php
public function useUrlEncoding($encode)
    {
        $this->urlEncode = ($encode === true) ? self::RFC_3986 : $encode;

        return $this;
    }
public function useUrlEncoding($encode)
    {
        $this->urlEncode = ($encode === true) ? self::RFC_3986 : $encode;

        return $this;
    }
public function useUrlEncoding ( $ encode ) { $ this -> urlEncode = ( $ encode === true ) ? self :: RFC_3986 : $ encode ; return $ this ; }
Set whether or not field names and values should be rawurlencoded

@param bool|string $encode Set to TRUE to use RFC 3986 encoding (rawurlencode), false to disable encoding, or
form_urlencoding to use application/x-www-form-urlencoded encoding (urlencode)
@return self
Set whether or not field names and values should be rawurlencoded