What is the interface in php?

This article mainly explains "what the interface refers to in php". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what the interface refers to in php.

In PHP, interface interface is a specification that defines a general specification for implementing a service, declares the required functions and constants, but cannot define member properties, classes can implement multiple interfaces, and interfaces can inherit interfaces.

This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.

What does the interface in php mean?

The interface interface is a stipulation, something for people to inherit, a bit like an abstract class.

The interface defines the general specification for implementing a service, declares the required functions and constants, but does not specify how to implement it. The details of the implementation are not given because different entities may need to implement common method definitions in different ways. The key is to establish a set of general principles that must be implemented, and only by meeting these principles can we say that this interface has been implemented.

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Features of the PHP interface (interface):

1. The method of the interface must be public.

2. The method of the interface is abstract by default, so the method name is not preceded by abstract.

3. The interface can define constants, but not member attributes. The definition and usage of constants are the same as those in classes.

4. Classes can implement multiple interfaces (equivalent to integrating multiple functions into one, such as PHS, MP3, MP4).

5. Interfaces can also inherit interfaces.

PHP, like most object-oriented languages, does not support multiple inheritance. If you need to implement multiple inheritance, in PHP, you can use the interface, which is PHP's way to solve the problem of multiple inheritance.

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