プロパティとメソッドへのアクセス_PHP チュートリアル

＜?php    class Room    {        public $name;        function __construct($name="unnamed")        {            $this->name = $name;        }    }    class House    {        //array of rooms        public $room;    }    //create empty house    $home = new house;    //add some rooms    $home->room[] = new Room("bedroom");    $home->room[] = new Room("kitchen");    $home->room[] = new Room("bathroom");    //show the first room of the house    print($home->room[0]->name); ?＞

＜?php    class Animal //动物    {        public $blood; //热血or冷血属性        public $name;        public function __construct($blood, $name=NULL)        {            $this->blood = $blood;            if($name)            {                $this->name = $name;            }        }    }    class Mammal extends Animal  //哺乳动物    {        public $furColor; //皮毛颜色        public $legs;        function __construct($furColor, $legs, $name=NULL)        {            parent::__construct("warm", $name);            $this->furColor = $furColor;            $this->legs = $legs;        }    }    class Dog extends Mammal      {        function __construct($furColor, $name)        {            parent::__construct($furColor, 4, $name);            self::bark();        }        function bark()        {            print("$this->name says 'woof!'");        }    }    $d = new Dog("Black and Tan", "Angus"); ?＞