PHP中interface与 implements 关键字
<?php//简单定义实现接口
interface UserInterface{//定义user接口
function getname();
}
interface TeacherInterface{ //定义teacher接口
function getLengthofService();
}
class User implements UserInterface{ //实现user接口
private $name="nostop";
public function getName(){
return $this->name;
}
}
class Teacher implements TeacherInterface{ //实现teacher接口
private $age=23;
public function getLengthofService(){
return $this->age;
}
}
$user=new User();
echo $user->getName().'<br />';//nostop
$teacher=new Teacher();
echo $teacher->getLengthofService().'<br />';//23
//继承类实现接口
class GraduResultudent extends User implements TeacherInterface{ //继承User类 实现接口
private $teacher;
public function __construct(){ //定义构造函数
$this->teacher=new Teacher();//实例化Teacher对象
}
public function getLengthOfService(){ //实现TeacherInterface接口的方法
return $this->teacher->getLengthOfService();
}
}
class Result{
public static function getUserName(UserInterface $_user){ //注意：这里面的类型变成接口类型
echo "Name is ".$_user->getName().'<br />';
}
public static function getLengthOfService(TeacherInterface $_teacher){ //注意：这里面的类型变成接口类型
echo "age is ".$_teacher->getLengthOfService();
}
}
$object=new GraduResultudent();
Result::getUserName($object); //Name is nostop
Result::getLengthOfService($object); //age is 23
echo "<br />";
//接口实现用户的折扣
interface People{ //定义接口
function getUserType();
function getCount();
}
class VipUser implements People{ //实现接口
//用户折卡系数
private $discount=0.8;
function getUserType(){
return "VIP用户";
}
function getCount(){
return $this->discount;
}
}
$vip=new VipUser(); //实现化对象
echo $vip->getUserType().'商品价格：'.$vip->getCount()*100;//VIP用户商品价格：80
class Goods{
var $price=100;
var $member;
function run(People $member){ //注意：这里面的参数类型是接口类型
$this->member=$member;
$discount=$this->member->getCount();
$usertype=$this->member->getUserType();
echo $usertype."商品价格：".$this->price*$discount;
}
}
$display=new Goods();
$display->run(new VipUser);//VIP用户商品价格：80
?>
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