购物车功能【CI实现】

在商城项目中，购物车是非常重要的一环，此处留下源码，留作笔记！！！

话不多说，往下看:

<?php 
defined("BASEPATH") OR exit("No direct script access allowed");

class cart extends Home_Controller {
	private $info = array();		#前台提交数据
	private $specData = array();	#规格信息
	private $prodData = array();	#货品组合信息
	private $cartData = array();	#购物车入库数据

	/**
	 * 构造函数
	 */
	public function __construct()
	{
		parent::__construct();
		$this->load->model("goodsModel","goods");
		$this->load->model("productModel","product");
		$this->load->model("goodsAttrModel","goodsAttr");
	}

	/**
	 * [购物车]数据添加
	 */
	public function cartAdd()
	{
		#接收购物车提交数据
		$this->info = $this->input->post();
	// $this->ajaxReturn($this->info);
		#1.验证商品库存、货品库存
		$this->checkGoodsNumber();
		#2.查询规格名称、价格
		$this->getSpecData();
		#3.组装购物车添加de数据
		$cartData = $this->setCartData();
	p(json_decode($this->input->cookie("cart"),true));
		# 一、判断是否登录
		if(!UID){
			//未登录 数据存入Cookie中
			//1:获取cookie中的购物车数据
			$cookieCartData = $this->input->cookie("cart");
			//2:判断cookie中数据是否为空
			if(empty($cookieCartData)){
				//2-1:为空则表示用户没有添加过购物车
				//2-1-1.设置Key-->生成购物车数据
				$key = $cartData["goods_id"]."-".$cartData["product_id"];
				$cookieCart = array($key => $cartData);
				//2-1-2.设置购物车返回值(商品数量、总价)
				$this->setCartReturn(1,$cartData["goods_price"]);
				//2-1-3.设置Cookie存储购物车数据
			}else{
				//2-2:不为空 表示用户添加过购物车
				//2-2-1.追加购物数据
				$cookieCart = $this->addCartData($cartData,json_decode($cookieCartData,true));
				//2-2-2.设置购物车返回值(商品数量、总价)
				$this->setCartReturn(count($cookieCart),array_sum(array_column($cookieCart, "goods_price")));
			}
			//3:设置Cookie存储购物车数据
			setCookie("cart",json_encode($cookieCart),LEFT_TIME,"/");
		}else{
			//已登录 数据存入数据库
			
		}
		//返回购物车提示数据
		$this->ajaxReturn($this->msg);
	}

	/**
	 * 验证商品库存
	 */
	public function checkGoodsNumber()
	{
		$this->goods->map = array(
			"goods_id"			=>	$this->info["goods_id"],
			"goods_number >="	=>  $this->info["buy_number"],
		);
		$this->goods = $this->goods->find("goods_id,goods_name,goods_sn,goods_img,shop_price");
		if(!$this->goods){
			$this->msg["msg"] = "商品库存不足";
			$this->ajaxReturn($this->msg);
		}
		#验证货品库存
		$this->product->map = array(
			"goods_id"			=>	$this->info["goods_id"],
			"product_attr"		=>	$this->info["prod_attr"],
			"product_number >="	=>  $this->info["buy_number"],
		);
		$this->prodData = $this->product->find();
		if(!$this->prodData){
			$this->msg["msg"] = "货品库存不足";
			$this->ajaxReturn($this->msg);
		}
		return true;
	}

	/**
	 * 组合规格名称、价格
	 */
	public function getSpecData()
	{
		$this->goodsAttr->map = inToType(explode("|", $this->info["prod_attr"]),"goods_attr_id");
		$goodsAttrInfo = $this->goodsAttr->select("goods_attr_value,goods_attr_price");
		$this->specData["product_attr_value"] = implode("|", array_column($goodsAttrInfo, "goods_attr_value"));
		$this->specData["product_price"] = array_sum(array_column($goodsAttrInfo,"goods_attr_price"));
		# 返回规格信息 $this->specData
	}


	/**
	 * 组装购物车添加的数组
	 */
	public function setCartData()
	{
		$this->cartData = array(
			"product_id"	=>	$this->prodData["product_id"],
			"product_attr"	=>	$this->prodData["product_attr"],
			"buy_number"    =>	$this->info["buy_number"],
			"goods_price"	=>	$this->info["shop_price"],
			"goods_sum"		=>	$this->info["shop_price"] * $this->info["buy_number"],
			"product_price"	=>	"",
			"product_attr_value"	=>	"",	
			"uid"			=>	UID,

		);
		$this->cartData = array_merge($this->cartData,$this->goods);
		#若存在规格【添加规格信息】
		if(!empty($this->info["prod_attr"])){
			$this->cartData["product_price"] = $this->specData["product_price"];
			$this->cartData["product_attr_value"] = $this->specData["product_attr_value"];
		}
		return $this->cartData;
		# 购物车 添加的总数据 $this->cartData;
	}


	/**
	 * 设置购物车返回提示数据
	 * @param [商品数量,总价]
	 */
	public function setCartReturn($number,$prices)
	{
		$this->msg["code"] = self::STATUS_ON;
		$this->msg["data"] = array(
				"number"    => 	$number,
				"prices"	=> 	$prices,
		);
	}

	/**
	 * 购物车 新添加数据
	 * @param  [新数据,原购物车数据]
	 */
	public function addCartData($newData,$oldData)
	{
		#组合Key
		$key = $newData["goods_id"]."-".$newData["product_id"];
		// #判断购物车中是否有该商品
		if(isset($oldData[$key])){
			//1.有 合并商品数量、价格
			$oldData[$key]["buy_number"] = $oldData[$key]["buy_number"] + $newData["buy_number"];
			$oldData[$key]["goods_price"] = $newData["goods_price"];
	 		$oldData[$key]["goods_sum"]	= $oldData[$key]["buy_number"] * $oldData[$key]["goods_price"]; 
		}else{
			//2.没有 追加新商品
			$oldData[$key] = $newData;
		}
		#返回购物车数据
		return $oldData;
	}

}
?>

CREATE TABLE `shop_goods` (
  `goods_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `goods_name` varchar(255) NOT NULL,
  `type_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`goods_id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

CREATE TABLE `shop_product` (
  `product_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `goods_id` int(11) NOT NULL,
  `goods_price` decimal(10,2) NOT NULL,
  `goods_num` int(11) NOT NULL,
  `goods_sn` varchar(50) NOT NULL,
  `goods_attr_id` varchar(100) NOT NULL,
  PRIMARY KEY (`product_id`)
) ENGINE=InnoDB AUTO_INCREMENT=18 DEFAULT CHARSET=utf8;

CREATE TABLE `shop_goods_attr` (
  `goods_attr_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `goods_id` int(11) NOT NULL,
  `attr_id` int(11) NOT NULL,
  `attr_value` varchar(255) NOT NULL,
  PRIMARY KEY (`goods_attr_id`)
) ENGINE=InnoDB AUTO_INCREMENT=126 DEFAULT CHARSET=utf8;

CI购物车总结完毕！！！