A brief introduction to abstract methods, abstract classes and interfaces in PHP

This article brings you a brief introduction to abstract methods, abstract classes and interfaces in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be useful to you. Helps.

Abstract method

abstract function say();

Abstract class

abstract class Person{    
abstract function say();
}

1. Abstract classes cannot be instantiated

2 . Abstract classes can have abstract methods

3. Subclasses must implement abstract methods

Interface

1. All methods in the interface It is an abstract method

2. The interface attribute must be a constant

3. It must be public

4.Interface declaration

interface Demo{    
const NAME=’ngyhd’;    
function test();}

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