[fw-mvc] howto: generate url with separators &, ? and =

I've a html form that enables users to search in a database.
The http://www.w3.org/TR/html401/interact/forms.html#h-17.13 W3C recommends
to use a GET method for this scenario. Posting a get form leads invariably
to a URI with a query part (e.g. ?key[]=a&key[]=b&foo=1)

My question: How do I create the query part of a URI programmatically from
an array in that form? I need this to generate hyperlinks.

I can use the URL view helper, but this will create, following the example,
something like this

key/a/key/b/foo/1

This is inconsisten with how GET-forms work. How can I pull out a real query
part?
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