How to implement kerberos authentication using PHP

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Windows

Kerberos

Dear Experts,
I am from ASP.NET/C# background and still working .Recently I am assigned to implement

kerberos Authentication using PHP

to secure login in a PHP(5) web Application .I searched and found something like php_krb5 as well as KADM5.
But no where I found a guide to implement this type of authentication.
As the time is too short to finish this requirement this is why I am here.
Please guide me .

What I have tried:

Yet not trying because I have no idea about implementation kerberos. Only I know the theory