These functions allow you to access Kerberos administration servers. In order to have these functions available, you must compile PHP with KADM5 support by using the --with-kadm5 configurable option. If you use this option without specifying the path to KADM5, PHP will use the built-in KADM5 client libraries. Users who run other applications that use KADM5 (for example, running PHP 4 and PHP 5 as concurrent apache modules, or auth-kadm5) should always specify the path to KADM5: --with-kadm5=/path/to/kadm5. This will force PHP to use the client libraries installed by KADM5, avoiding any conflicts.