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2025-01-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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This article mainly introduces "how to use extensions in php". In daily operation, I believe many people have doubts about how to use extensions in php. Xiaobian consulted various materials and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how to use extensions in php"! Next, please follow the small series to learn together!
In PHP, the extends keyword is used to define the inheritance of a class. The syntax is "class subclass extends parent class {}"; through this keyword, single inheritance can be achieved. A class can only inherit data directly from another class, but a class can have multiple subclasses.
Operating environment: Windows 10, PHP 5.6, Dell G3
What is the use of extensions in PHP?
In PHP, class inheritance is implemented using the extends keyword. The syntax format is as follows:
class subclass name extends parent class name { ... ...}
In C++, a subclass can inherit one base class or several base classes. Inheriting one base class is called single inheritance; inheriting multiple base classes is called multiple inheritance. However, there is no multiple inheritance in PHP, only single inheritance mode can be used. That is, a class can only inherit data directly from another class. However, a class can have multiple subclasses.
Member properties and methods in classes require access modifiers, an important feature of PHP object-oriented programming. The roles of different access modifiers and the differences between them are shown in the following table:
Examples are as follows:
Run the example and output:
My name is Zhang San
I am studying at Renmin University
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