php - Custom querystring-based routing in CodeIgniter or Phalcon

I develop webapps for a relatively large enterprise. In order to follow the company's security policy of only using obfuscated URIs, I usually use a homebrew framework using the front controller pattern.

Before obfuscation, the URIs come in this format:

domain.com/app_name/index.php?controller=A&action=B
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The entire query string gets processed first when generating links to produce URIs in this format:

domain.com/app_name/index.php?q=Y29udHJvbGxlcj1BJmFjdGlvbj1C
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where the value ofq isurlencode(base64_encode('controller=A&action=B'))

The front controller will, on receiving a request, first decode the value ofq and then set the parameters to$_GET, then the appropriate controller and action will be called based on that.

I'm about to start working on a new project and I want to try using a framework, either CodeIgniter (which I'm relatively familiar with) or Phalcon (which I would like to try). How do I implement this URI routing scheme in either framework? From my understanding both by default uses segment-based routing.