PHP匿名函数(闭包)

 1 <?php
 2 class anyMouseTest{
 3         //定义商品类型、价格
 4     const IPHONE6_PRICE = 5500;
 5     const XIAOMI4_PRICE = 1999;
 6     const HONERX_PRICE = 799;
 7 
 8     private $_productSort;
 9     private $_products;
10     
11     public function __construct(){
12         $this->_productSort = array(‘iphone6‘,‘xiaomi4‘,‘honerx‘);
13         $this->_products = array();
14     }
15 
16     public function addProduct($product , $sum){
17         if(in_array($product , $this->_productSort) && is_int($sum)){
18             $this->_products[$product] = $sum;
19         }
20     }
21 
22     public function getCount($tax){
23         $count = 0;
24 
25         $callback = function($sum , $product) use ($tax , &$count){
26             $price = constant(__CLASS__.‘::‘.strtoupper($product).‘_PRICE‘);
27             $curPrice = $price* $sum * $tax;
28             $count += $curPrice;
29         };
30 
31         array_walk($this->_products, $callback);
32         return $count;
33     }
34 }
35 
36 $oanyMouse = new anyMouseTest;
37 
38 $oanyMouse->addProduct(‘iphone6‘,1);
39 $oanyMouse->addProduct(‘honerx‘,2);
40 echo $oanyMouse->getCount(1);