笔记一：看书学设计模式

aboys

1. <?php
   
2. class CartLine
   
3. {
   
4.     public $price;
   
5.     public $num;
   
6. 
   
7.     public function total()
   
8.     {
   
9.         return $this->num * $this->price;
   
10.     }
    
11. }
    
12. 
    
13. class Cart
    
14. {
    
15.     protected $sale = 0.8;
    
16.     protected $lines = array();
    
17. 
    
18.     public function addLine($cart)
    
19.     {
    
20.         $this->lines[] = $cart;
    
21.     }
    
22. 
    
23.     public function calcTotal()
    
24.     {
    
25.         $total = 0;
    
26.         foreach ($this->lines as $line) {
    
27.             $total+= $line->total();
    
28.         }
    
29.         $total = $this->calcSaleTotal($total);
    
30.         return $total;
    
31.     }
    
32. 
    
33.     public function calcSaleTotal($amount)
    
34.     {
    
35.         return $amount * $this->sale;
    
36.     }
    
37. }
    
38. 
    
39. $obj1 = new CartLine();
    
40. $obj1->price = 100;
    
41. $obj1->num = 2;
    
42. $obj2 = new Cart();
    
43. $obj2->addLine($obj1);
    
44. echo $obj2->calcTotal();

忘记一切面向对象，重新学习，体会了一下分块设计原则手写了一下，购物车的打折设计