Below is the oracle error message for the error. Are you sure you have everything setup correctly and are using the functions correctly? Try and just do a connect and logoff and echo the connection variable returned by connect.
I have a system with netscape enterprise server 3.6+sunOS+php4.1.0+oracle, was php4.0.3pl1
ORA-24324: service handle not initialized
Cause: An attempt was made to use an improper service context handle.
Action: Verify that the service context handle has all the parameters initialized and set for this call.