Authenticating users from Windows Active Directory from PHP Code

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I want to authenticate users (defined in an Active Directory Service
running on a Windows 2000 Server machine) from PHP Code running under
Linux (Fedora Core 3 with Kerberos 5 installed). I just want to find
out whether a particular user (with a given username, password
combination) exists or not. Then I will login that user into my
intranet application (developed on PHP under Linux).

Any help will be greatly appreciated.

Thank You.

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