Hide parameter from URL

More than hiding is meant to avoid using sessions and hidden fields

I'm wondering about CI URL helper , CI Form helper and PHP native http_build_query()

I mean: get , eventually modify and return to view the query string but managing itself as property or variable to be passed from view forms to controllers and vice-versa, ending up to don't see anymore the query string in the URL

no more query string not as an aim/goal, but as simple consequence.

Obviously, hovering on the view links, you will see the full URL with the query string, but because it then needs to be sent back to some controller.