A PHP interface establishes a contract that a class must adhere to. An interface is a blueprint for classes, same as a PHP class is for objects. In terms of what may be called, how it can be called, and what will be returned, any class implementing a given interface can be expected to behave the same way.
Unrelated classes can implement the same set of functions using an interface, regardless of where they are in the class inheritance structure. You can model numerous inheritances using the interface.
Only if the method declaration in both interfaces is identical can a class implement two interfaces that define the same method with the same name. The arguments of a class that implements an interface may have a different name than the interface.
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