装饰器模式

<?php
abstract class Component {
abstract public function operation();
}

class MyComponent extends Component
{
public function operation()
{
echo “ 这是正常的组件方法 <br>”;
}
}

abstract class Decorator extends Component {
protected $component;
function __construct(Component $component)
{
$this->component = $component;
}

public function operation()
{
$this->component->operation();
}
}

class MyDecorator extends Decorator
{

function __construct(Component $component)
{
parent::__construct($component);
}

public function addMethod()
{
echo “ 这是装饰器添加的方法 <br>”;
}

public function operation()
{
$this->addMethod();
parent::operation();
}
}

$component = new MyComponent();
$da = new MyDecorator($component);
$da->operation();