Can PHP Retrieve Active Directory Username?

Determining Windows Username in PHP

In an intranet PHP application, extracting user information such as IP and hostname is readily attainable. However, capturing their Active Directory/Windows username presents a unique challenge.

Can PHP Retrieve Active Directory Username?

Yes, it is possible. By leveraging the AUTH_USER request variable, you can access the username. This variable remains empty for web applications that allow anonymous access. However, if your server utilizes basic or Windows integrated authentication, AUTH_USER will contain the authenticated user's username.

Windows Integrated Authentication in Active Directory

In an Active Directory domain, Internet Explorer users can seamlessly provide their domain credentials to the server if the proper web server/filesystem permissions are in place. As a result, AUTH_USER will display the username in the format MYDOMAINuser.name without prompting users for explicit login credentials to your web application.

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