php 获取提示：对象类型

参数变量可以包含任何类型的数据，也可以包含任何类型的对象。php5引入了类的类型提示。增加一个方法参数的类型提示，把类名放在需要约束的方法参数之前。

class User{

    public function __construct($name,$sex,$height){
        $this->name=$name;
        $this->sex=$sex;
        $this->height=$height;
        }

    public function show(){
        echo "姓名：".$this->name." 性别：".$this->sex;
        }

}

class Book{

    public function __construct($author,$prince,$public){
        $this->author=$author;
        $this->prince=$prince;
        $this->public=$public;
        }

    public function show(){
        echo "作者：".$this->author." 发布：".$this->public;
        }

}

class UserAdmin{
    public static function changeName(Book $name){
        $name->show();
    }
}

$user = new User("黎明","男","170");
UserAdmin::changeName($user);
//该片段来自于http://outofmemory.cn