PHP Interface (interface) and abstract class

Interface

Defines an interface class in which the subclasses of a method must be implemented. An interface is a template for a class whose subclasses must implement all the methods defined in the interface.

Interface user{

function getheight ($height);

function Getweight ($weight);

}

Class My implements user{

function GetHeight ($username) {

Echo $height;

}

function Getweight ($weight) {

Echo $weight;

}

}

Abstract

The abstract class pulls out the parts of the class image, which is to write the repetition into the abstract class and reduce the workload. As long as the method is not declared in abstract, it is not implemented in its subclasses. And in subclasses, the method is a public method.

Abstract user{

Abstract function getheight ($height);

function Getweight () {

Echo $weight;

}

}

Class My extends user{

function GetHeight ($height) {

Echo $height;

}

function Getinfobyid ($id) {

$this->getweight. " <br/> ";

echo $id;

}

}