ThinkPHP5+Redis实现购物车

本篇文章是通过ThinkPHP5和Redis实现购物车,功能包括:购物车列表、添加购物车、获取部分商品、获取部分商品总数量、获取全部商品总数量、商品减一、修改商品数量、删除商品、清空购物车,这些功能基本上能够满足购物车的需求,代码写的不够严谨,但大致逻辑就是这样。

前提:安装PHP运行环境,安装Redis,PHP安装Redis扩展,需要同时满足以上三个条件才能使用Redis。

参考文章:

一、先看一个运行截图(主要实现功能,页面没有优化)

 二、附上代码

1、前端

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8">
</head>
<body>
<h3>我的购物车</h3>
<form action="/index/index/index" method="post">
    
    <input type="text" name="ids">
    <input type="submit" value="获取部分商品信息">
    <span style="color: gray; font-size: 14px;">用英文逗号隔开</span>
</form>
所选商品数量:{$totalnum}
<br><br>

<form action="/index/index/emptyCart">
    <input type="submit" value="清空购物车">
</form>
<br>

<table border="1">
    <tr align="center">
        <td style="width: 100px">商品ID</td>
        <td style="width: 100px">商品属性ID</td>
        <td style="width: 100px">商品名</td>
        <td style="width: 100px">商品属性名称</td>
        <td style="width: 100px">数量</td>
        <td style="width: 100px">单价</td>
        <td style="width: 100px">运费</td>
        <td style="width: 100px">总价</td>
        <td style="width: 100px">操作</td>
    </tr>
    {volist name="list" id="vo"}
    <tr align="center">
        <td style="width: 100px">{$vo.goods_id}</td>
        <td style="width: 100px">{$vo.attr_id}</td>
        <td style="width: 100px">{$vo.goods_name}</td>
        <td style="width: 100px">{$vo.attr_name}</td>
        <td style="width: 100px">{$vo.goods_number}</td>
        <td style="width: 100px">{$vo.price}</td>
        <td style="width: 100px">{$vo.freight}</td>
        <td style="width: 100px">{$vo.subtotal}</td>
        <td style="width: 100px"><a href="/index/index/del.html?id={$vo.goods_id}">删除</a></td>
    </tr>
    {/volist}
</table>

<br/>
<hr/>


<h3>添加购物车</h3>

<form action="/index/index/addbasket" method="post">
    
    商品ID:<input type="text" name="goods_id" value="111">
    商品属性ID:<input type="text" name="attr_id" value="222">
    商品名:<input type="text" name="goods_name" value="U盘">
    商品属性名称:<input type="text" name="attr_name" value="数码类">
    <br/><br/>&nbsp; &nbsp;量:<input type="text" name="number" value="1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;价:<input type="text" name="price" value="12">&nbsp; 费:<input type="text" name="freight" value="10">

    <input type="submit" value="添加购物车">
</form>

<br/>
<hr/>

<h3>某一商品减一</h3>
<form action="/index/index/reduce" method="post">
    商品ID:<input type="text" name="id"> 
    商品属性ID:<input type="text" name="attr_id"> 
    减去数量:<input type="text" name="number"> 
    <input type="submit" value="减一">
</form>
<br/>
<hr/>

<h3>编辑商品</h3>
<form action="/index/index/edit" method="post">
    商品ID:<input type="text" name="id"> 
    商品属性ID:<input type="text" name="attr_id"> 
    修改数量:<input type="text" name="number"> 
    <input type="submit" value="修改">
</form>
<br/>
<hr/>

</body>
</html>

2、后端代码

<?php
namespace app\index\controller;
use think\Controller;
use think\cache\driver\Redis;

class Index extends Controller
{

    private $expire = 43200;    //redis缓存过期时间  12h
    private $redis = null;
    private $cachekey = null;    //缓存变量名
    private $basket = [];        //私有数组,存放商品信息

    private $user_id = '110';
    
    /**
     * 购物车初始化,传入用户id
     */
    public function __construct()
    {
        parent::__construct();

        $this->redis = new \Redis();        // 实例化
        $this->redis->connect('127.0.0.1','6379');
        $this->redis->auth('zxf123456');

        $this->cachekey = 'user'.$this->user_id.'.cart';    //redis缓存键名拼接用户id与字符串为对象用户购物车缓存键名  user110.cart
        $this->basket = json_decode($this->redis->get($this->cachekey),true);    //获取对象用户的redis购物车商品缓存信息并解码为数组
    }

    /**
     * 获取所有商品信息
     */
    public function index()
    {
        $ids = input('post.ids');
        // 如果获取部分商品信息(搜索进来)
        if (!empty($ids)) {

            // 获取部分商品信息
            $list = $this->getPartGoods($ids);

            // 获取部分商品数量
            $totalnum = $this->getPartGoodsNum($ids);

        }else{
            // 默认全部列表
            $list = $this->basket;
            // 获取所有商品数量
            $totalnum = $this->getAllDoodsNum();
        }
        $this->assign(['list'=>$list,'totalnum'=>$totalnum]);
        return $this->fetch();
    }

    /**
     * 添加商品到购物车
     * @param 商品id 商品属性id 商品名称 数量 价格
     */
    public function addbasket()
    {

        $data = request()->param();
        // 判断对象是否已经存在redis购物车缓存中
        if ($this->isExist($data['goods_id'],$data['attr_id'])) {

            // 存在缓存中,增加该商品数量
            return $this->add($data['goods_id'],$data['attr_id'],$data['number']);
        }

        // 对象商品不在redis缓存中时
        $tmp = [];
        $tmp['goods_id'] = intval($data['goods_id']);    //商品id
        $tmp['attr_id'] = intval($data['attr_id']);    //商品属性id
        $tmp['goods_name'] = $data['goods_name'];        //商品名
        $tmp['attr_name'] = $data['attr_name'];            //商品属性名称
        $tmp['goods_number'] = intval($data['number']);            //商品数量,新增的商品默认加入数量为1
        $tmp['price'] = intval($data['price']);            //商品价格
        $tmp['freight'] = intval($data['freight']);        //运费

        $tmp['subtotal'] = $tmp['goods_number'] * $tmp['price'] + $tmp['freight'];    //商品总价

        $this->basket[] = $tmp;        // 把新的商品信息追加到之前的商品缓存数组中,每件属性商品对应一个索引键值

        
        // 把新的购物车信息编码为json字符串,并重新存入到redis购物车缓存中
        $this->redis->setex($this->cachekey,$this->expire,json_encode($this->basket));

        // return 1;
        echo "<script>alert('添加成功');window.location.replace(document.referrer);;</script>";
    }

    /**
     * 判断商品是否已经存在
     * @param 商品id 商品属性id
     */
    public function isExist($id,$attr_id)
    {
        $isExist = false;
        // 当对象用户redis购物车商品缓存不为空时
        if (!empty($this->basket)) {

            foreach ($this->basket as $key => $value) {
                // 判断当前商品是否存在
                if ($value['goods_id'] == $id && $value['attr_id'] == $attr_id) {
                    $isExist = true;
                    break;
                }
            }
        }
        return $isExist;
    }

    /**
     * 添加商品
     */
    public function add($id,$attr_id,$number)
    {

        $goods_number = 0;    //加入不成功时默认添加数量为0
        // 商品id不为空并且商品在redis购物车商品缓存中
        if (!empty($id) && $this->isExist($id,$attr_id)) {

            $cache_detail = $this->basket;        //获取用户购物车所有商品
            foreach ($cache_detail as $key => $value) {

                if ($value['goods_id'] == $id && $value['attr_id'] == $attr_id) {

                    // 只修改商品数量和总价
                    $value['goods_number'] = $value['goods_number'] + $number;    //增加购物车商品数量
                    $value['subtotal'] = $value['goods_number'] * $value['price'] + $value['freight'];    //重新计算总价  数量*单价+运费
 

                    $this->basket[$key] = $value;    //把该商品重新放到redis缓存中
                    $this->redis->setex($this->cachekey,$this->expire,json_encode($this->basket));

                    $goods_number = $value['goods_number'];
                    break;

                }
            }
        }
        return $goods_number;    //返回商品数量
    }

    /**
     * 获取部分商品
     */
    public function getPartGoods($ids)
    {
        // 字符串转数组
        $ids = explode(',', $ids);
        $goods = [];
        // 循环ids数组,循环redis缓存数组,当商品id一致时,取出来存到goods数组中
        foreach ($ids as $v) {
            foreach ($this->basket as $key => $value) {
                if ($value['goods_id'] == $v) {

                    $goods[] = $value;
                }
            }
        }
        return $goods;
    }

    /**
     * 获取部分商品总数
     */
    public function getPartGoodsNum($ids)
    {
        // 字符串转数组
        $ids = explode(',', $ids);
        $number = 0;    //默认为0
        foreach ($ids as $v) {

            foreach ($this->basket as $key => $value) {

                // 取出redis缓存中有该id的商品数量
                if ($value['goods_id'] == $v) {
                    $number += $value['goods_number'];
                }
            }
        }
        return $number;
    }

    /**
     * 获取全部商品数量
     */
    public function getAllDoodsNum()
    {
        $number = 0;
        if (!empty($this->basket)) {
            foreach ($this->basket as $key => $value) {
                $number += $value['goods_number'];
            }
        }
        return $number;
    }

    /**
     * 某一商品数量减一
     */
    public function reduce()
    {
        $data = request()->param();
        $goods_number = 0;    //默认减0

        // 如果接收的数据不为空,并且该商品信息存在
        if (!empty($data) && $this->isExist($data['id'],$data['attr_id'])) {

            // 获取redis缓存里的数据
            $cache_detail = $this->basket;

            // 循环判断,从缓存商品列表中找到该条商品,数量并减一
            foreach ($cache_detail as $key => $value) {
                if ($value['goods_id'] == $data['id'] && $value['attr_id'] == $data['attr_id']) {

                    // 先判断当前商品的数量是否大于要删除的数量
                    if ($value['goods_number'] < $data['number']) {

                        echo "<script>alert('商品数量不足');window.history.back();</script>";
                        break;
                    }
                    // 如果当前商品数量为1,则删除
                    if ($value['goods_number'] <= 1) {

                        // 循环判断找出该商品,并删除
                        foreach ($this->basket as $key => $value) {
                            if ($value['goods_id'] == $data['id']) {
                                // 从数组中移除当前商品
                                array_splice($this->basket, $key, 1);
                            }
                        }
                        // 重新存入缓存
                        $this->redis->setex($this->cachekey,$this->expire,json_encode($this->basket));
                        $goods_number = 0;

                    }else{

                        // 数量减
                        $value['goods_number'] = $value['goods_number'] - $data['number'];
                        $goods_number = $value['goods_number'];
                        // 计算总价
                        $value['subtotal'] = $value['goods_number'] * $value['price'];
                        
                        // 把新的数据追加到$this->basket
                        $this->basket[$key] = $value;

                        // 重新存入缓存
                        $this->redis->setex($this->cachekey,$this->expire,json_encode($this->basket));
                    }
                }
            }
        }
        // return $goods_number;
        echo "该商品当前数量为".$goods_number;
    }

    /**
     * 删除商品
     */
    public function del()
    {
        $id = input('id');
        // 循环判断,并删除
        foreach ($this->basket as $key => $value) {
            if ($value['goods_id'] == $id) {
                // 从数组中移除当前商品
                array_splice($this->basket, $key, 1);
            }
        }
        $this->redis->setex($this->cachekey,$this->expire,json_encode($this->basket));
        // return true;
        echo "<script>alert('删除成功');window.location.replace(document.referrer);;</script>";
    }

    /**
     * 编辑商品
     */
    public function edit()
    {
        $data = input('post.');
        if (!empty($data) && $this->isExist($data['id'],$data['attr_id']) && $data['number'] > 0) {

            // 取出缓存中的数据
            $cache_detail = $this->basket;

            // 循环判断,取出当前商品信息,并修改
            foreach ($cache_detail as $key => $value) {

                if ($value['goods_id'] == $data['id'] & $value['attr_id'] == $data['attr_id']) {

                    // 商品数量
                    $value['goods_number'] = intval($data['number']);
                    // 商品总价 数量*单价+运费
                    $value['subtotal'] = $value['goods_number'] * $value['price'] + $value['freight'];
                    // 赋值
                    $this->basket[$key] = $value;

                    // 重新存储到缓存
                    $this->redis->setex($this->cachekey,$this->expire,json_encode($this->basket));
                    echo "该商品当前数量为".$value['goods_number'];
                }
            }
        }
    }

    /**
     * 清空购物车
     */
    public function emptyCart()
    {
        $this->redis->rm($this->cachekey);
        echo "<script>alert('购物车清空成功');window.location.replace(document.referrer);;</script>";
    }

}

有一点需要注意:“use think\cache\driver\Redis;”把redis引进来,这个Redis文件是TP5自带的,不用下载就可以直接用。代码里有注释,其他的就不再说明了,其他文件也没有什么需求配置的

 

三、常见错误

列一下我在使用过程中遇到的问题

  1. 在“清空购物车”这个功能里,有一句“ $this->redis->rm($this->cachekey);”,执行这句的时候会报错,"Function Redis::delete() is deprecated",意思是delete()这个函数已经被弃用了,可以查找到Redis文件里rm()这个函数,里面用到了delete()这个函数,只需要把delete()改成del就可以了,因为php-redis 5 已经把这个函数弃用了

其他弃用函数

posted @ 2020-12-22 10:13  下页、再停留  阅读(407)  评论(0编辑  收藏  举报