Interfaces allow you to define the capabilities of an object. These definitions make it easier to write automated tests and help your code follow the Liskov substitution principle (the L in the five SOLID principles of object-oriented programming).

We'll look at the how to define and implement an interface, we'll write automated tests using the interface to mock the object, and we'll swap out one object for another to see how the interface helps us make this change.

We'll also cover the differences between Interfaces & Traits ... as well as review the basics of how Inheritance works as well.

Come into this 2hr workshop with questions, and leave with a solid understanding of how PHP Objects work.

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