modular implementation

[eluser]misterdonut[/eluser]
how may i do this

http://domain.com/module/controller/function/uri3/uri4

sample.
users/picture/add
users/picture/view
users/profile/edit
group/profile/edit
group/members/show

im thinking to put it on a folder
like

application
- controller
-- users
---- picture.php
---- profile.php
-- group
---- members.php
---- profile.php

any ideas?
TIA