Join url

I have current URL-request: catalog/browse

I need join catalog/browse and my new request, that get route catalog/browse?cat=1

How to get a current address and add to it another option?

Not sure if this is what you are after, but try the following in your controller: $this->createUrl(‘catalog/browser’,array(‘cat’ => 1’));

and if the request is not known catalog/browse ?

Then just leave it empty.

$this->createUrl(’’, array(‘cat’ => 1))

For details, see documentation.