php decoration mode

interface Transform
{
	public function move();
}

final class Car implements Transform
{
	public function __construct() {
		echo '变形金刚是一辆汽车';
	}
	public function move() {
		echo '在陆地上移动';
	}
}

class Changer implements Transform
{
	private $transform;
	public function __construct($tansform='') {
		$this->transform = $tansform;
	}
	public function move() {
		$this->transform->move();
	}
}

class Root extends Changer
{
	public function __construct($tansform='') {
		parent::__construct($tansform);
		echo '变成机器人';
	}
	public function say() {
		echo '说话';
	}
}
class Airplane extends Changer
{
	public function __construct($tansform='') {
		parent::__construct($tansform);
		echo '变成机飞机';
	}
	public function fly() 
	{
		echo '在天空飞翔';
	}
}

$camaro = new Car();
echo '<br>';
$camaro->move();
echo '<br>';
echo '-----------';
echo '<br>';

$bumblebee = new Airplane($camaro);
echo '<br>';
$bumblebee->move();
echo '<br>';
$bumblebee->fly();

echo '<br>';
echo '-----------';
echo '<br>';

$bumblebee = new Root($camaro);
echo '<br>';
$bumblebee->move();
echo '<br>';
$bumblebee->say();