Jim Plush has taken a look at his models in the Zend Framework and has rethought them a bit to work with a bit more complex process than the usual simple sort of Zend Framework application.

The current active record/table gateway patterns just aren't going to cut it for the complex business logic that's approaching. I'm starting to lean towards the domain model approach which would increase the initial complexity of the design but allow for the flexibility for future changes and features. The issue is with where to put your business logic?

He diagrams out his potential solution and includes two bits of code showing how it would work in practice. He's soliciting opinions as to the validity of this approach too, wondering if its the best way to go for more complex application structures requiring these sorts of business requirements.