What are the things that inherit from parent classes in php?

The ones that inherit parent classes in PHP are: 1. Single-layer inheritance, one subclass inherits one parent class; 2. Multi-layer inheritance, subclasses can also be used as parent classes of other classes, forming a multi-layer inheritance relationship. ; 3. Interface inheritance, a class can implement multiple interfaces at the same time.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

In PHP, class inheritance can be achieved through the keyword extends. Subclasses can inherit the properties and methods of the parent class, and can also add their own properties and methods. Here are some examples of inheritance in PHP:

1. Single-level inheritance: A child class inherits a parent class.

   class ParentClass {
       // 父类的属性和方法
   }
   class ChildClass extends ParentClass {
       // 子类继承了父类的属性和方法，并可以添加自己的属性和方法
   }

2. Multi-layer inheritance: Subclasses can also be used as parent classes of other classes to form a multi-layer inheritance relationship.

   class GrandParentClass {
       // 父类的属性和方法
   }
   class ParentClass extends GrandParentClass {
       // 父类继承了祖父类的属性和方法
   }
   class ChildClass extends ParentClass {
       // 子类继承了父类的属性和方法，并可以添加自己的属性和方法
   }

3. Interface inheritance: PHP also supports interface inheritance, and a class can implement multiple interfaces at the same time.

   interface InterfaceA {
       // 接口A的方法
   }
   interface InterfaceB {
       // 接口B的方法
   }
   class MyClass implements InterfaceA, InterfaceB {
       // 类实现了接口A和接口B的方法
   }

It should be noted that PHP does not support multiple inheritance (one class inherits multiple parent classes), but similar effects can be achieved through interface inheritance. Through inheritance, you can utilize existing code and functions and modify and extend them in subclasses to achieve code reuse and better organization.

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