Interested in Abstract Extension API and Dependency Interface

Hi,

I'm Varuna Jayasiri, a second year undergraduate student at University of
Moratuwa, Sri Lanka.

I read the description about the proposed idea in the GSOC 2009 idea list.
Although I have experience with C/C++ and PHP, I haven't worked on
(developed) extensions for PHP.  So can you please help me find soe web
resources (I went through source code of two extensions :) ) where I can
find more information, regarding PHP extensions and present problems, so
that I can prepare a better application and make sure that I can complete
the project before I apply :).

Also, in order to deal with the problem of load order, is it fine to have
two rounds of extension initialisation:
1. First to collect the API structures and dependancies of all extensions
and
2. Then to initialise only the extensions where all (required)dependancies
are available.

Thank you
 Varuna