4-6-2.php

php电子书

4-6-2.php<br>
//多态<br>
<?
class User{ // User接口
	public function  getName(){}
}

class NormalUser extends User { // 继承自User类
	private $name;
	public function getName(){
		return $this->name;
	}
	public function setName($_name){
		$this->name = $_name;
	}
}

class UserAdmin{ //操作.
	public static function  ChangeUserName(User $_user,$_userName){
		$_user->setName($_userName);
	}
}

$normalUser = new NormalUser();
UserAdmin::ChangeUserName($normalUser,"Tom");//这里传入的是 NormalUser的实例.
echo $normalUser->getName();
?>