4-7-2.php

php电子书

4-7-2.php
<br>instanceof运算符.<br>
<?
class User{
	private $name;
	public function  getName(){
		return "UserName is ".$this->name;
	}
}

class NormalUser extends User {
	private $age = 99;
	public function getAge(){
		return "age is ".$this->age;
	}
}

class UserAdmin{ //操作.
	public static function  getUserInfo(User $_user){
		echo $_user->getAge();
	}
}
$User = new User(); // 这里new的是User.
UserAdmin::getUserInfo($User);
?>