Sorry by client code i mean the php code calling the class. Will try and be more specific:

If I create a class which requires 2 variables to be passed into it in order for it to be instantiated and I only pass in 1 then php will error. Is there a way i can cater for this error in the class? i.e. can i make a class robust enough to elegantly handle not getting the variables passed in to it that it expects? Hope this is clear enough.