php 商场收银收费系统,使用的策略模式

<?php
//策略模式就是你有很多的方法,选择一种适合自己的,
// 单例模式就是只有一个实例对象,不需要每个文件都要加载,比如连接数据库,
// 工厂模式就是//策略模式 优惠系统、工资计算系统
//工厂模式 主要应用在多数据库选择，类库文件加载等//商场收银系统有正常收费,打折收费,返利收费模式
interface cashStrategy{
public function acceptCash($money);
}
//正常收费
class NormalStrategy implements cashStrategy{
public function acceptCash($money){
return $money;
}
}
//打折收费
class RebateStrategy implements cashStrategy{
//打折比例
private $moneyRebate = 1;
public function __construct($rebate){
$this->moneyRebate = $rebate;
}
public function acceptCash($money){
return $this->moneyRebate*$money;
}
}
//返利收费
class ReturnStrategy implements cashStrategy{
//返利条件
private $moneyCondition = null;
//返利多少
private $moneyReturn = null;
public function __construct($moneyCondition ,$moneyReturn){
$this->moneyCondition = $moneyCondition;
$this->moneyReturn = $moneyReturn;
}
public function acceptCash($money){
if(!isset($this->moneyCondition) || !isset($this->moneyReturn) || $this->moneyCondition == 0)
return $money;
return $money - floor($money/$this->moneyCondition)*$this->moneyReturn;
}
}// 加载所有的策略// 创建一个环境类，根据不同的需求调用不同策略
class Factory{
private $_strategy = null;
public function __construct($type = null){
if(!isset($type))
return;
$this->setCashStrategy($type); }
public function setCashStrategy($type){
$cs = null;
switch($type){
case 'normal':
$cs = new NormalStrategy();
break;
case 'rebate8':
$cs = new RebateStrategy(0.8);
break;
case 'return300to100':
$cs = new ReturnStrategy(300,100);
break;
}
$this->_strategy = $cs;
}
//获取结果
public function getResult($money){
return $this->_strategy->acceptCash($money);
}
public function getResultAll($type, $num, $price){
$this->setCashStrategy($type);
return $this->getResult($num * $price);
}}/*
* 客户端类
* 让客户端和业务逻辑尽可能的分离，降低客户端和业务逻辑算法的耦合，
* 使业务逻辑的算法更具有可移植性
*/
class Client{ public function main(){
$total = 0; $factory = new Factory(); // 购买数量
$numA = 10;
// 单价
$priceA = 100;
// 策略模式获取结果
$totalA = $factory->getResultAll('normal', $numA, $priceA);
$this->display('A', 'normal', $numA, $priceA, $totalA); // 购买数量
$numB = 5;
// 单价
$priceB = 100;
// 打折策略获取结果
$totalB = $factory->getResultAll('rebate8', $numB, $priceB);
$this->display('B', 'rebate8', $numB, $priceB, $totalB); // 购买数量
$numC = 10;
// 单价
$priceC = 100;
// 返利策略获取结果
$totalC = $factory->getResultAll('return300to100', $numC, $priceC);
$this->display('C', 'return300to100', $numC, $priceC, $totalC);
} /**
* 打印
*
* @param string $name 商品名
* @param string $type 类型
* @param int $num 数量
* @param double $price 单价
* @return double
*/
public function display($name, $type, $num, $price, $total){
echo date('Y-m-d H:i:s') . ",$name,[$type],num:$num,price:$price,total:$total<br>";
}
}/**
* 程序入口
*/
function start(){
$client = new Client();
$client->main();
}start();?>打印结果:
2018-10-09 11:17:30,A,[normal],num:10,price:100,total:1000
2018-10-09 11:17:30,B,[rebate8],num:5,price:100,total:400
2018-10-09 11:17:30,C,[return300to100],num:10,price:100,total:700