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In PHP, interface is a regulation that defines the general specification for implementing a certain service and declares the required functions and constants. However, it cannot define member attributes. A class can implement multiple interfaces, and the interface Interfaces can also be inherited.
The operating environment of this article: Windows 10 system, PHP version 7.1, Dell G3 computer.
Interface interface is a regulation, something that people can inherit, a bit like an abstract class.
The interface defines the general specification for implementing a certain service, declaring the required functions and constants, but does not specify how to implement it. The reason why implementation details are not given is because different entities may need to implement public method definitions in different ways. The key is to establish a set of general principles that must be implemented. Only when these principles are met can the interface be said to be implemented.
Extended information
Characteristics of PHP interface:
1. The methods of the interface must be public.
2. Interface methods are abstract by default, so do not add abstract in front of the method name.
3. Interfaces can define constants, but cannot define member attributes. The definition and usage of constants are the same as those in classes.
4. A class can implement multiple interfaces (equivalent to integrating multiple functions into one, such as a mobile phone that implements the functions of PHS, MP3, and MP4)
5. Interfaces can also be inherited interface.
PHP, like most object-oriented languages, does not support multiple inheritance. If you need to implement multiple inheritance functions, in PHP, you can use interfaces, which is PHP's way to solve multiple inheritance problems.
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