PHP设计模式之状态模式（State）代码实例大全（29）

布满荆棘的人生 2022-12-08 13:00 152阅读 0赞

## 目的 ##

状态模式可以基于一个对象的同种事务而封装出不同的行为。它提供一种简洁的方式使得对象在运行时可以改变自身行为，而不必借助单一庞大的条件判断语句。

## UML图 ##

![20200919144419223.png][]

[★官方PHP高级学习交流社群「点击」管理整理了一些资料，BAT等一线大厂进阶知识体系备好（相关学习资料以及笔面试题）以及不限于：分布式架构、高可扩展、高性能、高并发、服务器性能调优、TP6，laravel，YII2，Redis，Swoole、Swoft、Kafka、Mysql优化、shell脚本、Docker、微服务、Nginx等多个知识点高级进阶干货][PHP_BAT_TP6_laravel_YII2_Redis_Swoole_Swoft_Kafka_Mysql_shell_Docker_Nginx]

## 代码 ##

*  ContextOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    class ContextOrder extends StateOrder
    {
        public function getState():StateOrder
        {
            return static::$state;
        }
    
        public function setState(StateOrder $state)
        {
            static::$state = $state;
        }
    
        public function done()
        {
            static::$state->done();
        }
    
        public function getStatus(): string
        {
            return static::$state->getStatus();
        }
    }

*  StateOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    abstract class StateOrder
    {
        /**
         * @var array
         */
        private $details;
    
        /**
         * @var StateOrder $state
         */
        protected static $state;
    
        /**
         * @return mixed
         */
        abstract protected function done();
    
        protected function setStatus(string $status)
        {
            $this->details['status'] = $status;
            $this->details['updatedTime'] = time();
        }
    
        protected function getStatus(): string
        {
            return $this->details['status'];
        }
    }

*  ShippingOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    class ShippingOrder extends StateOrder
    {
        public function __construct()
        {
            $this->setStatus('shipping');
        }
    
        protected function done()
        {
            $this->setStatus('completed');
        }
    }

*  CreateOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    class CreateOrder extends StateOrder
    {
        public function __construct()
        {
            $this->setStatus('created');
        }
    
        protected function done()
        {
            static::$state = new ShippingOrder();
        }
    }

## 测试 ##

*  Tests/StateTest.php

<?php
    
    namespace DesignPatterns\Behavioral\State\Tests;
    
    use DesignPatterns\Behavioral\State\ContextOrder;
    use DesignPatterns\Behavioral\State\CreateOrder;
    use DesignPatterns\Behavioral\State\ShippingOrder;
    use PHPUnit\Framework\TestCase;
    
    class StateTest extends TestCase
    {
        public function testCanShipCreatedOrder()
        {
            $order = new CreateOrder();
            $contextOrder = new ContextOrder();
            $contextOrder->setState($order);
            $contextOrder->done();
    
            $this->assertEquals('shipping', $contextOrder->getStatus());
        }
    
        public function testCanCompleteShippedOrder()
        {
            $order = new ShippingOrder();
            $contextOrder = new ContextOrder();
            $contextOrder->setState($order);
            $contextOrder->done();
    
            $this->assertEquals('completed', $contextOrder->getStatus());
        }
    }

[PHP 互联网架构师成长之路\*「设计模式」终极指南][PHP]

[PHP 互联网架构师 50K 成长指南+行业问题解决总纲（持续更新）][PHP _ 50K]

[面试10家公司，收获9个offer，2020年PHP 面试问题][10_9_offer_2020_PHP]

★如果喜欢我的文章，想与更多资深开发者一起交流学习的话，获取更多大厂面试相关技术咨询和指导，欢迎加入我们的群啊，暗号：phpzh（君羊号码856460874）。

[2020年最新PHP进阶教程，全系列！][2020_PHP]

![20200919144419973.png][]

> 内容不错的话希望大家支持鼓励下点个赞/喜欢，欢迎一起来交流；另外如果有什么问题 建议 想看的内容可以在评论提出

[20200919144419223.png]: /images/20221123/91d50f252a0a4ebbac52fb266bf882d2.png
[PHP_BAT_TP6_laravel_YII2_Redis_Swoole_Swoft_Kafka_Mysql_shell_Docker_Nginx]: https://link.zhihu.com/?target=https%3A//jq.qq.com/%3F_wv%3D1027%26k%3D48yySdN5
[PHP]: https://zhuanlan.zhihu.com/p/189702435
[PHP _ 50K]: https://zhuanlan.zhihu.com/p/174655616
[10_9_offer_2020_PHP]: https://zhuanlan.zhihu.com/p/145553170
[2020_PHP]: https://www.zhihu.com/club/1288844274021441536/post/1288864908286148608
[20200919144419973.png]: /images/20221123/49b3dea313824b7bbe4536c8423c23a9.png