Code documentation

Hi everyone, I was wondering if there was any documentation to the source code of php. I have to work on some internal patches to PHP for my company to offer php for a large number of users. I already did the patches but had a hard time understanding all the source code because of all the defines and macros that are scattered throughout all the code files. I started noting about all the PLS_FETCH(), and ELS_FETCH() and #ifdef ZTS and all that stuff but i really have a hard time sometime debugging my patches cause i don't really know what that function specifically does. now that i have new patches to do, i wish i had a plain documentation. I'd really appreciate one of you giving me access to one doc about all that stuff if there exists one :) Thanks a lot for all your help. -- Mark Villemade Hosting & Communication Tools Technical Manager MultiMania & Lycos Group