jyil/php-menu

This a demo for build composer packagist

dev-master 2017-08-17 05:12 UTC

Requires

• php: >=5.6.0

MIT

• jyiL

README

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);
	}
}