Help: Clear Kerberos Logins Information

[Lee Eric]

Hi,

My site(Apache httpd + mod_auth_kerb) is using Kerberos as
authentication method and written by PHP. Is there possible that I can
use PHP codes like Logout to "cleat" Kerberos login credentials? Then
after page refresh user can input username/password again.

I noticed that Firefox and Chrome can do this to clean active logins.
Just don't know how to do that.

Here's my Kerberos configs in httpd.

  AuthType Kerberos
  AuthName "Kerberos Login"
  require valid-user
  KrbMethodNegotiate On
  KrbAuthRealms GARFIELD.INTERNAL
  Krb5Keytab "/etc/httpd/httpd.keytab"

Thanks.

Eric