[PHP知识库]基础设计模式回忆录

随着开发时间越长好多设计模式逐渐记的不清晰了，重新回忆下，做下记录

• PHP单例模式(有个简单的短语“三私一公”)
  简单来说就是三个私有方法，一个公有方法
  __construct,__clone,$instance三个私用
  对外提供一个公有获取实例的方法

<?php

class Singleton
{
    private static $instance;

    private function __construct()
    {
        echo 'no construct';
    }

    private function __clone()
    {
        echo 'no clone';
    }

    public static function getInstance()
    {
        if (self::$instance instanceof Singleton) {
            return self::$instance;
        }
        return new self();
    }
}

• 工厂模式

<?php

interface People
{
    public function say();
}

class Man implements People
{
    public function say()
    {
        echo 'I m Man \n';
    }
}

class WoMan implements People
{

    public function say()
    {
        echo 'I m Woman \n';
    }
}

class SimpleFactory
{
    public static function createMan()
    {
        return new Man();
    }

    public static function createWoMan()
    {
        return new WoMan();
    }
}


$man = SimpleFactory::createMan();
$man->say();
$woMan = SimpleFactory::createWoMan();
$woMan->say();

• 工厂方法

<?php

interface People
{
   public function say();
}

class Man implements People
{
   public function say()
   {
       echo 'I m Man \n';
   }
}

class WoMan implements People
{

   public function say()
   {
       echo 'I m Woman \n';
   }
}

// 工厂方法模式是将创建对象抽象成一个接口，以来关系用对工厂的依赖转移到接口上
interface FactoryCreator
{
   public function create();
}

class CreateMan implements FactoryCreator
{

   public function create()
   {
       return new Man();
   }
}

class CreateWoman implements FactoryCreator
{
   public function create()
   {
       return new Woman();
   }
}
$creator = new CreateMan();
$man = $creator->create();
$man->say();

$creator = new CreateWoman();
$man = $creator->create();
$man->say();

• 抽象工厂
  最少3个接口（品类1接口，品类2接口，抽象工厂接口），以及他们3个接口的实现类

<?php

interface Message
{
    public function send();
}

class AliMessage implements Message
{

    public function send()
    {
        echo 'Ali send message';
    }
}

class JiguangMessage implements Message
{

    public function send()
    {
        echo 'Jiguang send message';
    }
}

class BaiduMessage implements Message
{

    public function send()
    {
        echo 'Baidu send message';
    }
}

interface Push
{
    public function send();
}

class AliPush implements Push
{
    public function send()
    {
        echo 'Ali send push';
    }
}

class JiguangPush implements Push
{
    public function send()
    {
        echo 'Jiguang send push';
    }
}

class BaiduPush implements Push
{
    public function send()
    {
        echo 'baidu send push';
    }
}

interface AbstractFactory
{
    public function createMessage();

    public function createPush();
}

class AliAbstractFactory implements AbstractFactory
{

    public function createMessage()
    {
        return new AliMessage();
    }

    public function createPush()
    {
        return new AliPush();
    }
}

class JiguangAbstractFactory implements AbstractFactory
{

    public function createMessage()
    {
        return new JiguangMessage();
    }

    public function createPush()
    {
        return new JiguangPush();
    }
}

class BaiduAbstractFactory implements AbstractFactory
{

    public function createMessage()
    {
        return new BaiduMessage();
    }

    public function createPush()
    {
        return new BaiduPush();
    }
}

$AliFactory = new AliAbstractFactory();
$aliMessage = $AliFactory->createMessage();
$aliPush = $AliFactory->createPush();
$aliMessage->send();
$aliPush->send();