PHP面向对象程序设计之接口的继承定义与用法详解

<?php
interface User {
  public function getName();
  public function setName($_name);
}
interface VipUser extends User {
  public function getDiscount(); //添加了获得折扣的抽象方法.
}
class Vip implements VipUser {
  private $name;
  private $discount = 0.8;// 定义折扣变量
  public function getName(){ //实现getName方法
    return $this->name;
  }
  public function setName($_name){//实现setName方法
    $this->name = $_name;
  }
  public function getDiscount(){//实现折扣方法.
    return $this->discount;
  }
}
?>

<?php
interface User {
  public function getName();
  public function setName($_name);
}
interface Administrator {
  public function setNews($_news);
}
//注意这里的多继承.
interface NewsAdministrator extends User,Administrator{
}
class NewsAdmin implements NewsAdministrator { //实现接口
  public function getName(){
    //.........
  }
  public function setName($_name){
    //.........
  }
  public function setNews($_news){
    //.........
  }
}
?>

<?php
interface User {
  public function getName();
  public function setName($_name);
}
//AbstractNormalUser 只实现了 User接口中的一个方法,
abstract class AbstractNormalUser{
  protected $name;
  public function getName(){
    return $this->name;
  }
}
//这里实现了接口的另外一个方法.
class NormalUser extends AbstractNormalUser {
  public function setName($_name){
    $this->name = $_name;
  }
}
$normalUser = new NormalUser();
$normalUser->setName("tom");
echo "name is ".$normalUser->getName();
?>