Domain-Driven Design in PHP

The Dependency Inversion Principle (DIP)

How can we fix this? As the Domain Model layer depends on concrete infrastructure implementations, the Dependency Inversion Principle, or DIP, could be applied by relocating the Infrastructure layer on top of the other three layers.

The Dependency Inversion Principle High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend on details. Details should depend on abstractions. Robert C. Martin

By using the Dependency Inversion Principle, the architecture schema changes, and the Infrastructure layer — which can be referred to as the low-level module — now depends on the UI, the Application layer, and the Domain layer, which are the high-level ...