Help Writing testcases

You probably here this a lot but I want to help (have been wanting to for a while but couldn't see where I could fit in the PHP world best). I am interested in helping to write test cases for all the various functions in PHP. I have been looking over the qa.php.net site and read the "Creating new test files" page. Went looking in the cvs (src/test) to see what is in there. looked at the func/basic/lang directories and saw that almost none of tests for the actual functions are made (least that follow your naming convention). :) I figure that writing test cases for the basic functions - all I need is an understanding of PHP and the ability to read the manual. I can do this. :) So if you'll have me - is there anything I need to know beforehand? Should I just start at the beginning of the manual and work my way back or do you have a list of stuff you want done first? Who would I turn over the test cases to (assuming you would want to check over my work beforehand to make sure I am doing it correctly)? How would I know what is done already and what needs doing? Respectfully, Ligaya Turmelle -- life is a game... so have fun.