AD Authentication from PHP

I have a webpage that I want to secure to Active Directory users. Basically I want my users to visit a page that has a form on, enter their AD credentials, and click the login. I want someone to program a PHP script that then checks if the member is part of an AD group, and then either allows them access, or denies them access I know there is LDAP function to use, and we have that ready, but integrating it with PHP is above my skill Obviously I cant give you access to my domain/ad but I can test it from my end. I'm sure it will only take someone less than an hour to write something small like this Thanks Mike Yates New Jersey