PHP - is there any way to get client user name (AD)

I am developing a web based tool and planning for a role based access to the tool. Currently all the users who use this tool will access the tool web portal from their laptop after authenticating to it using active directory authentication.

My server side configuration is based on Apache webserver and PHP on an RHEL machine.

So is there any way to get the AD user ID of the user using which he logged into his laptop, so that I can allow him to access only those pages allowed for him.