php URL routing. please help me to understand.

[eluser]FutureKing[/eluser]
[quote author="Natebot" date="1243127275"]FutureKing,

Take a look at the source of CI_URI and CI_Router in system/libraries/URI.php and system/libraries/Router.php for how Codeigniter detects the URI string and uses it for routing, in particular the private functions. Then look at system/codeigniter/codeigniter.php for the client code that uses those classes to load controllers ,etc.[/quote]

THANKS!