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The difference between an interface and an abstract class. What is the difference between an interface and an abstract class? what is the basis for using an interface and an abstract class? The concepts of interfaces and abstract classes are

: This article mainly introduces the abstract class (abstractclass) and interface (interface) in PHP. For more information about PHP tutorials, see. I. abstract class 1. abstract class refers to a class with abstract keywords added before the class

1. abstract class refers to a class with abstract keywords added before the class and abstract methods (abstract keywords added before the function keyword of the class method. 2. abstract classes cannot be directly instantiated. Abstract classes

1. abstract class abstractclass1. abstract class refers to a class with abstract keywords added before class (abstract keywords added before class method function keywords. 2. abstract classes cannot be directly instantiated. Abstract classes only

Transferred from: http://blog.csdn.net/sunlylorn/article/details/6124319Abstract class1. An abstract class is a class that has an abstract keyword in front of the class and an abstraction method (which adds the abstract keyword before the class

Abstract class 1. An abstract class is a class that has an abstract keyword in front of the class and an abstraction method (which adds the abstract keyword before the class method function keyword). 2. Abstract classes cannot be instantiated

Introduction and Application of abstract keywords in PHP abstract methods and abstract classes, abstract keywords PHP abstract methods and abstract keywordsAbstract keywords are used to define abstract methods and abstract classes. Abstract

  This article mainly introduces the PHP interface and abstract class use examples, and did a detailed explanation, the need for friends can refer to the following Abstract class 1. An abstract class is a class that has an abstract keyword in

In the actual PHPWe'll use it regularly in development. PHPAbstract classes and interfaces, let's talk about it in detail today. PHPWhat the abstract classes and interfaces are all about. Abstract class 1. An abstract class is a class that has an

In an object-oriented (OOP) language, a class can have one or more subclasses, and each class has at least one interface that the public method accesses as external code. and abstract methods are introduced to facilitate inheritance, now look at how