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[eluser]xwero[/eluser]
You could do

Code:

function category($chosen_category)
{
   if(func_num_args() > 1)
   {
      // error
   }

   // other code
}

Another way to do it is to add a routing rule

Code:

$route['controller/function/\d.+'] = 'error/page';

If you use php5 you can do something like

Code:

$keys = array('controller/function/\d.+');
$route = array_fill_keys($keys, 'error/page');

This way you only have to maintain the excess parameter urls.

But i'm sure there are other solutions.