active directory and PHP

Hi, I'm new to PHP, so sorry if my question looks like stupid. I have a web application which use authorization and authentication process to log-in. I would like to know if it exists a way to synchronize the authentication with our Active Directory domain ? Something like a single side-on. In fact, i want from my web application users to make them remember only their login/pwd from Active directory to use my application. thanks a lot, Alain