How to redirect with some parameter in admin

Question

Hi i try to redirect in magento from back end module. i use the following query.

$this->_redirect('*/*/');

It was working but my module page will not work without category id in GET parameter with in the url.

So i use the following code

$this->_redirect('*/*/?category_id='.$category_id);

but now this time directly going to the home page. please any one have any solution for it?

Answer 1

$this->_redirect('*/*/', array('_query', array('category_id',$category_id));

Should do the job, see also: https://stackoverflow.com/a/4540289/622945 and your duplicated question on Stack Overflow: https://stackoverflow.com/q/33435543/622945