How to use interface in the php interface

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1. Description

The methods in the interface are all abstract methods and are public.

2. Interfaces can also inherit interfaces, but subclasses must implement all methods

Interface E extends A {/ / Interface E inherits the method defined in A must be implemented in the interface Aline E.

3. Implement multiple inheritance:

We all know that classes (class) in PHP are single inheritance, so is there no way to implement multiple inheritance? The answer is no. We can implement multiple inheritance of classes in other special ways, such as using interface interface implementation, as long as the characteristics of the class are abstracted into interfaces, and objects have multiple identities by implementing interfaces, so that multiple inheritance can be simulated.

The following is an example of multiple inheritance using an interface (interface). The source code is as follows:

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