title: How can I read a QueryString in CodeIgniter?
body: <p>I know it's been asked before, but I need it for affiliate tracking...</p>
  
  <p><a href="http://www.mysite.com/controller/method/params?affiliate=123&amp;sub_id=456" rel="nofollow noreferrer">http://www.mysite.com/controller/method/params?affiliate=123&amp;sub_id=456</a></p>
  
  <p>How can I get the params AND the $_GET parameters outlined in that URL?</p>