Adding AD to a web site

Adding AD to a web site

I've been working on a site (for my company) to allow selected data center
users to remotely access a scheduling calendar and some pages offering
information on the various servers they are coming to the site to
access--on a separate site. Initially, I was under the impression that I'd
be creating a database and registration page to add, authorize or track
end users. My initial project coding has been a combination of HTML, PHP,
CSS, and MySQL and Apache for the database side. Now I've been told that
we will be using AD, tied into our company's official Active Directory, so
that users can use the same IDs and passwords that they've already had
approved by our company.
My question is (hopefully) simple. Is there a certain web programming
language that I should use in creating the pages that works better with
Active Directory than others?