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This article mainly explains "which keyword is inherited by php implementation". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "which keyword is inherited by php implementation?"

The key word inherited by the php implementation is "extends". Single inheritance mode can only be used in PHP, that is, one class can only inherit data directly from another class; and class inheritance needs to be achieved through the "extends" keyword, syntax "class subclass name extends parent class name {.}".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

One of the benefits of object-oriented programming (OOP) is that you can use one class to inherit another existing class, which is called a parent class or base class, and a class that inherits that parent class as a subclass. Subclasses can inherit the methods and properties of the parent class, so inheritance can not only improve the reusability of code, but also improve the efficiency of software development.

Subclasses can add new functionality beyond the parent class, so they can also be called "extensions" of the parent class. In addition, a subclass can inherit the constructor of the parent class, and when the subclass is instantiated, PHP looks for the constructor in the subclass first. If the subclass has its own constructor, PHP calls the constructor in the subclass first. When it is not in the subclass, PHP calls the constructor in the parent class.

Class inheritance needs to be implemented through the extends keyword. The syntax format is as follows:

Class subclass name extends parent class name {.}

Note: unlike languages such as Java, in PHP, a class can only inherit data directly from one class, that is, single inheritance. But a class can have multiple subclasses.

Example:

Run the example and output:

My name is Zhang San. I am studying at Renmin University.

In software development, the inheritance of classes makes the established software open and expandable, which is an effective method for information organization and classification, which simplifies the workload of creating objects and classes and increases the reproducibility of the code. Using inheritance, the standard hierarchical structure of the class is provided. Through the inheritance relationship of classes, the common features can be shared and the reusability of the software is improved.

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