jyil/php-menu

This a demo for build composer packagist

Menu类

1. 方法calculate, 输入订单后(json字符串，结构如上题), 输出价格
2. 方法discount, 可设定折扣，输出格价时自动计算折扣
3. 静态方法counter。输出calculate方法被调用的次数

$order = '[{"food_id":1,"num":2},{"food_id":3,"num":1},{"food_id":6,"num":2},{"food_id":7,"num":1}]';
include __DIR__.'/Menu.class.php';
echo '

<

pre>';
$test = new Menu();
// var_dump($test->foodMenu());
// var_dump($test->discount('20%'));
// var_dump($test->calculate($order));
// var_dump($test::counter());

<?php

// namespace Exam;

/**
 * Menu类
 * @author ljy
 * @date 2017/03/28
 */
class Menu {

    private $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"}
                                            ]}      
        ]';
    private $food = ''; 
    private $total = '';    

    /**
     * 初始化菜单
     */ 
    function __construct() {
        $this->food = json_decode($this->menu,1);
    }

    /**
     * 获取菜单列表
     * @return array
     */
    public function foodMenu() {
        return json_decode($this->menu,1);
    }

    /**
     * 计算订单价格
     * @param string $order 订单
     * @return int 
     */ 
    public function calculate($order) {
        @file_put_contents('counter', 1, FILE_APPEND);
        if(!isset($order)) return false;

        $order = json_decode(strval($order),1);

        if(!$order) return false;

        foreach ($this->food as $value) {
            foreach ($value['food'] as $val) {
                $food[] = $val;
            }
        }

        foreach ($food as $value) {
            foreach ($order as $val) {
                // var_dump(array_intersect_key($val,$value));exit;
                if($val['food_id'] === $value['food_id']) {
                    $price = $value['price'];           // 单价
                    $num = $val['num'];                 // 数量
                    $this->total += $price * $num;      // 求和
                }

            }
        }

        /** 计算折扣 **/
        @$discount = file_get_contents('discount');
        if($discount && !empty($discount)) {
            $this->total = $this->total * $discount;
        }
        return $this->total;
    }

    /**
     * 设定折扣
     * @param string $tmp
     * @return int
     */
    public function discount($tmp) {
        if(!isset($tmp)) return false;

        $tmp = str_replace('%', '', $tmp);
        $tmp =  $tmp / 100;
        @file_put_contents('discount', $tmp);

        return true;
    }

    /**
     * 输出calculate方法被调用的次数
     * @return int
     */
    public static function counter() {
        @$num = file_get_contents('counter');
        return strlen($num);
    }
}