519014 PHP Script. Get all dates i.e. Sun Mon between two dates

I found a great script that can do this at [login to view URL] However, it has an issue when I use start date 2011-09-04 and end date 2011-12-30 and tried to locate every Sunday. It display the correct dates for Sept, October but when it goes to October and November and December, it returns the dates of Saturday. I need someone to fix this script and send me the updated version. Looking for a fast turnaround (2 days). Please note, I want to make sure the updated script can return the dates correctly for any days (Sunday, Monday, Tuesday, Wednesday, etc) Thanks,