结构型--桥接模式

设计模式

颜色抽象类

<?php
/**
 * Color.php 颜色抽象类
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
abstract class Color
{
    abstract public function output();
}

红色类

<?php
/**
 * RedColor.php 红色
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
class RedColor extends Color
{
    public function output()
    {
        return "红色";
    }
}

绿色类

<?php
/**
 * GreenColor.php 绿色
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
class GreenColor extends Color
{
    public function output()
    {
        return "绿色";
    }
}

黄色类

<?php
/**
 * YellowColor.php 黄色
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
class YellowColor extends Color
{
    public function output()
    {
        return "黄色";
    }
}

形状抽象类 注入颜色类

<?php
/**
 * Shape.php 形状抽象类
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
abstract class Shape
{
    /**
     * @var Color
     */
    protected $color;
    /**
     * Shape constructor.
     *
     * @param Color $color
     */
    public function __construct(Color $color)
    {
        $this->color = $color;
    }
    /**
     * @return mixed
     */
    abstract public function run();
}

圆形

<?php
/**
 * Circle.php 圆形
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
class Circle extends Shape
{
    public function run()
    {
        echo "{$this->color->output()} 圆形\n";
    }
}

正方形

<?php
/**
 * Square.php 正方形
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
class Square extends Shape
{
    public function run()
    {
        echo "{$this->color->output()} 正方形\n";
    }
}

三角形

<?php
/**
 * Triangle.php 三角形
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
class Triangle extends Shape
{
    public function run()
    {
        echo "{$this->color->output()} 三角形\n";
    }
}

客户端调用

<?php
/**
 * Client.php
 *
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/11
 * @copyright Swoole, Inc.
 * @package   sy-records/design-patterns
 */
namespace Luffy\DesignPatterns\Bridge;
require __DIR__ . '/../vendor/autoload.php';
class Client
{
    public function run()
    {
        $red = new RedColor();
        $yellow = new YellowColor();
        $green = new GreenColor();
        // 红色的正方形
        $redSquare = new Square($red);
        $redSquare->run();
        // 黄色的正方形
        $yellowSquare = new Square($yellow);
        $yellowSquare->run();
        // 绿色的正方形
        $greenSquare = new Square($green);
        $greenSquare->run();
        // 红色的三角形
        $redTriangle = new Triangle($red);
        $redTriangle->run();
        // 黄色的三角形
        $yellowTriangle = new Triangle($yellow);
        $yellowTriangle->run();
        // 绿色的三角形
        $greenTriangle = new Triangle($green);
        $greenTriangle->run();
        // 红色的圆形
        $redCircle = new Circle($red);
        $redCircle->run();
        // 黄色的圆形
        $yellowCircle = new Circle($yellow);
        $yellowCircle->run();
        // 绿色的圆形
        $greenCircle = new Circle($green);
        $greenCircle->run();
    }
}
$client = new Client();
$client->run();

参考资料:
swoole微课堂
示例代码