PHP Matrix

AJ Matrix is the latest and most advanced Matrix affiliate Script with
level upto mxr can be customised according to needs. It is a complete
web application developed using PHP with MYSQL as back-end. Full
developer API allows for endless possibilities and use in your own
project. When creating a new user account, the user is sent an email
with a verification code which is used to verify that the email
address is real.

sources: http://www.ajsquare.com/demo/matrix/admin/adminhome.php