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这题怎么做,求解?!!~~~

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<?php

/*

一.按照给定菜单(menu)和订单(order),计算订单价格总和

*/


$menu = '[

            {"type_id":1,"name":"大菜","food":[

                                            {"food_id":1,"name":"鱼香肉丝","price":"10"},

                                            {"food_id":2,"name":"红烧肉","price":"11"},

                                            {"food_id":3,"name":"香辣粉","price":"12"}

                                            ]},

            {"type_id":2,"name":"中菜","food":[

                                            {"food_id":4,"name":"小炒肉","price":"13"},

                                            {"food_id":5,"name":"云吞","price":"14"}

                                            ]},

            {"type_id":3,"name":"小菜","food":[

                                            {"food_id":6,"name":"雪糕","price":"15"},

                                            {"food_id":7,"name":"黄瓜","price":"16"}

                                            ]}      

        ]';


/*

*/


//num系数量

$order = '[{"food_id":1,"num":2},{"food_id":3,"num":1},{"food_id":6,"num":2},{"food_id":7,"num":1}]';


/*

二.设计一个类Menu,实现以下功能:

1. 设定菜单,每个实例必须有且只有一个菜单(json字符串,结构如上题)

2. 方法calculate, 输入订单后(json字符串,结构如上题), 输出格价

3. 方法discount, 可设定折扣,输出格价时自动计算折扣

4. 静态方法counter。输出calculate方法被调用的次数

*/



  • biubiubiu
  • biubiubiu     2018-09-18 14:53:18 3楼

    class Menu{
    private $menu;//菜单
    private $discountNum=10;//折扣
    static $calculateCount=0;//调用次数


    public function __construct($menu){
    $this->menu=json_decode($menu,true);
    }


    public function calculate($order){
    self::$calculateCount++;
    $totalPrice=0;
    $order=json_decode($order,true);
    foreach ($order as $key => $value) {
    $foodPrice=$this->getFoodPrice($value['food_id']);
    $num=$value['num'];
    $totalPrice+=($foodPrice*$num);
    }
    echo '原总价为:'.$totalPrice.'<br/>';
    echo '折扣价为:'.$totalPrice*($this->discountNum/10).'<br/>';
    }


    public function discount($discountNum){
    return $this->discountNum=$discountNum;
    }


    public static function counter(){
    echo 'calculate方法的调用次数为:'.self::$calculateCount.'<br/>';
    }


    public function getFoodPrice($foodId){
    foreach ($this->menu as $key => $value) {
    foreach ($value['food'] as $key => $value) {
    if($foodId==$value['food_id']){
    return $value['price'];
    }
    }
    }
    }


    }


    $menu='[
    {"type_id":1,"name":"大菜","food":[
    {"food_id":1,"name":"鱼香肉丝","price":"10"},
    {"food_id":2,"name":"红烧肉","price":"11"},
    {"food_id":3,"name":"香辣粉","price":"12"}
    ]},
    {"type_id":2,"name":"中菜","food":[
    {"food_id":4,"name":"小炒肉","price":"13"},
    {"food_id":5,"name":"云吞","price":"14"}
    ]},
    {"type_id":3,"name":"小菜","food":[
    {"food_id":6,"name":"雪糕","price":"15"},
    {"food_id":7,"name":"黄瓜","price":"16"}
    ]}
    ]';


    $order1='[
    {"food_id":1,"num":2},
    {"food_id":3,"num":1},
    {"food_id":6,"num":2},
    {"food_id":7,"num":1}
    ]';
    $order2='[
    {"food_id":1,"num":2},
    {"food_id":4,"num":1},
    {"food_id":6,"num":7},
    {"food_id":5,"num":6}
    ]';
    $order3='[
    {"food_id":1,"num":2},
    {"food_id":2,"num":17},
    {"food_id":4,"num":24},
    {"food_id":7,"num":11}
    ]';


    $menu1=new Menu($menu);
    $menu1->discount(8.7);
    $menu1->calculate($order1);
    $menu1->calculate($order2);
    $menu1->calculate($order3);
    Menu::counter();


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  • jesse
  • jesse     2018-09-08 12:11:50 1楼

    json和数组转化,并OOP基础知识的一并考察,如果觉得无从下手去中文网看看相关视频。

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