http://www.lanecn.com/article/main/aid-16 对原始代码进行了封装
<?php
/*
* 策略模式
*/
// 策略模式，策略就是算法和变化，策略模式就是对算法和变化的封装。是条件选择从客户端到服务端的转移。客户端与算法类的彻底隔离。
//场景： 沃尔玛要做一个收银软件。有打8折，打5折等，有每满100减20等。
abstract class Pay{
public $cash='';
public $total='';
public function getResult(){
return $this->total;
}
}
class Discount extends Pay{
public function __construct($cash=''){
$this->cash = $cash;
}
public function algorithm($discount="0.8"){
$this->total = $this->cash*$discount ;
return $this->getResult();
}
}
class Reduce extends Pay{
private $satisfied = 100;
private $return_cash = 20;
public function __construct($cash=''){
$this->cash = $cash;
}
public function algorithm(){
$this->total = $this->cash - floor($this->cash/$this->satisfied)*$this->return_cash;
return $this->total;
}
}
class Context{
private $obj;
private $price;
public function __construct($type='', $price=''){
$this->price = $price;
switch ($type){
case 1:
$this->obj = new Discount($price);
break;
case 2:
$this->obj = new Reduce($price);
break;
}
}
public function algorithm(){
return $this->obj->algorithm();
}
}
$total = new Context(2,188);
echo $total->algorithm();
