How to make an interface in php

In PHP, you can use the syntax "interface Action(){public function eat( $foods ); }" to define an interface. This statement means that the interface defines "public" access attribute methods.

Define the common behaviors of different classes, and then implement different functions in different classes.

The specific syntax of the PHP interface:

The interface is a part that can be composed of multiple parts to form a new thing;

The interface itself is abstract, internal The declared method is also abstract; a class can implement multiple interfaces at once without adding abstract

. The syntax is implemented with implements, and then the functions of the interface are implemented;

Interfaces can also be inherited based on bases, using extends;

Interfaces are descriptions of a bunch of methods, and attributes (member variables) cannot be added;

Interfaces are used for assembly into classes, and methods can only be public;

Interfaces serve as a strict specification to reduce communication between developers and callers

Interface implementation

Example of humans and animals implementing a certain action

Definition of interface

interface Action(){ 
    //接口定义‘public’访问属性方法，无需实现方法 
    public function eat( $foods ); 
}

Human (Animl) class implementation interface:

class Human implements Action(){ 
    //实现接口，必须提供接口中定义的方法 
    public function eat( $foods){ 
        echo "Human eat {$foods}"; 
    } 
} 
#Animal类 
class  Animal implements Action(){ 
    public function eat( $foods){ 
        echo "Animal eat {$foods}"; 
    } 
}

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