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:
1. 源代码
<?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,'https://www.jb51.net/'); }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; } } ?>
2. 数据库