结构型--装饰器模式

设计模式

饮品接口

<?php
/**
 * Drinks.php
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/15
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Decorator;
interface Drinks
{
    public function name();
    public function price();
}

茶类 实现饮品接口

<?php
/**
 * Tea.php
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/15
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Decorator;
class Tea implements Drinks
{
    public function name()
    {
        return '茶';
    }
    public function price()
    {
        return 10;
    }
}

装饰器抽象类 实现饮品接口 茶类注入

<?php
/**
 * Decorator.php 装饰器
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/15
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Decorator;
abstract class Decorator implements Drinks
{
    /**
     * @var Drinks
     */
    protected $drinks;
    /**
     * Decorator constructor.
     *
     * @param Drinks $drinks
     */
    public function __construct(Drinks $drinks)
    {
        $this->drinks = $drinks;
    }
}

红茶 继承装饰器

<?php
/**
 * BlackTea.php 红茶
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/15
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Decorator;
class BlackTea extends Decorator
{
    public function name()
    {
        return '柠檬红'.$this->drinks->name();
    }
    public function price()
    {
        return $this->drinks->price() + 5;
    }
}

奶茶 继承装饰器

<?php
/**
 * MilkTea.php 奶茶
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/15
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Decorator;
class MilkTea extends Decorator
{
    public function name()
    {
        return '珍珠奶'.$this->drinks->name();
    }
    public function price()
    {
        return $this->drinks->price() + 8;
    }
}

客户端 对象注入

<?php
/**
 * Client.php
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/15
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Decorator;
require __DIR__ . '/../vendor/autoload.php';
class Client
{
    public static function run()
    {
        $tea = new Tea();
        echo $tea->name();
        echo $tea->price()."元\n";
        $blackTea = new BlackTea($tea);
        echo $blackTea->name();
        echo $blackTea->price()."元\n";
        $milkTea = new MilkTea($tea);
        echo $milkTea->name();
        echo $milkTea->price()."元\n";
    }
}
Client::run();

参考资料:
swoole微课堂
示例代码