Shulou(Shulou.com)06/03 Report--

This article mainly introduces "the introduction and example usage of the abstract method of PHP and the abstract class abstract keyword". In the daily operation, I believe that many people have doubts about the introduction and example usage of the abstract method of PHP and the abstract class abstract keyword. The editor consulted all kinds of materials and sorted out simple and useful operation methods. I hope it will be helpful to answer the doubts about the abstract methods of PHP and the introduction and example usage of the abstract class abstract keyword. Next, please follow the editor to study!

PHP Abstract methods and Abstract Class abstract keywords

The abstract keyword is used to define abstract methods and classes.

Abstract method

An abstract method refers to a method without a method body, specifically without {} parentheses and its contents when the method is declared, but directly ending with a semicolon after the method name.

The abstract keyword is used to define abstract methods, syntax:

Abstract function function_name ()

Abstract class

As long as a method in a class is an abstract method, the class is defined as an abstract class. Abstract classes are also defined using the abstract keyword.

Abstract classes cannot produce instance objects, they are usually used as templates for overloading subclass methods, and all methods in inherited abstract classes are implemented. In fact, abstract classes are introduced to facilitate inheritance.

Example:

The copy code is as follows:

In this example, the parent class defines the abstract method and the implementation of the method, but the actual content is defined in the subclass.

At this point, the study of "introduction and instance usage of abstract methods and abstract class abstract keywords of PHP" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.