php用session实现购物车的方法

php用session实现购物车的方法：首先创建前端代码实现加入购物车动作；然后在PHP文件中实现购物车数据的逻辑判断；接着根据数据加载列表；最后通过unset等函数实现商品的删除或金额计算即可。

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PHP 使用session实现购物车效果（点击按钮添加数据，根据数据生成列表，删除选中的商品，点击按钮时计算金额）

效果图

代码很多，截取一部分

加入购物车（点击按钮添加session数据）

 // 加入购物车
 function addshopping() {
 <?php
 $db = db($_GET['db']);
 $id = $formatData['id'];
 $user = $formatData['user'];
 // 当购物车没有时，即没有session数据时
 if (empty($_SESSION['gwc'])) {
 $arr = array(array('user' => $user, 'db' => $db, 'id' => $id, 'num' => 1));
 $_SESSION['gwc'] = $arr;
 } else {
 // 当购物车有数据时
 $arr = $_SESSION["gwc"];
 $order = false;
 foreach ($arr as $key => $value) {
 // 如果数据中有了这个数据
 if ($value['user'] == $user && $value['db'] == $db && $value['id'] == $id) {
 $index = $key; //保存这个相同数据的下标，以便操作
 $order = true;	
 //定义一个变量，看是佛有相同的数据，需要注意的是，不能再这个if语句中else，否则后面的语句
 //虽然会使数量加一，但是还是会多创建一条数据，为什么，自己想想就能明白，只是当时当局者迷
 }
 }
 if ($order) {
 // 如果该商品在购物车存在，让数量加1
 $arr[$index]['num']++;
 } else {
 // 如果该商品购物车里面不存在，造一个一维数组扔到二维里面
 $arr[] = array('user' => $user, 'db' => $db, 'id' => $id, 'num' => 1);
 }
 $_SESSION["gwc"] = $arr;
 }

 ?>
 console.log('addshopping');
 }

根据数据加载列表

 <!-- 购物车列表 -->
 <?php
 foreach ($_SESSION['gwc'] as $dataList) {
 $clean = array();
 $clean['user'] = $dataList['user'];
 $clean['db'] = $dataList['db'];
 $clean['id'] = $dataList['id'];
 $clean['num'] = $dataList['num'];

 $res = $conn->fetchRow("SELECT * FROM {$clean['db']} WHERE id={$clean['id']}");
 $clean['title'] = $res['title'];
 $clean['price'] = $res['price'];
 $clean['face'] = $res['face'];

 ?>
 <p class="weui-content">
 <p class="weui-panel weui-panel_access">

 <p class="weui-panel__hd"><span><?php echo $clean['user']; ?> </span><a href="javascript:void(0)" class="wy-dele"><!-- 删除 --></a></p>

 <p class="weui-panel__bd">
 <p class="weui-media-box_appmsg pd-10">
 <p class="weui-media-box__hd check-w weui-cells_checkbox">
 <label class="weui-check__label" for="cart-<?php echo $clean['db'] . '-' . $clean['id'] ?>">
 
 <p class="weui-cell__hd cat-check">
 <input type="checkbox" class="weui-check" name="cartpro" id="cart-<?php echo $clean['db'] . '-' . $clean['id'] ?>"><i class="weui-icon-checked"></i>
 </p>
 </label>
 </p>
 <p class="weui-media-box__hd"><a href="pro_info.php?db=<?php echo $clean['db']; ?>&id=<?php echo $clean['id']; ?>"><img class="weui-media-box__thumb" src="<?php echo $clean['face']; ?>" alt="" style="height: 100%"></a></p>
 <p class="weui-media-box__bd">
 <h1 class="weui-media-box__desc"><a href="pro_info.php?db=<?php echo $clean['db']; ?>&id=<?php echo $clean['id']; ?>" class="ord-pro-link"><?php echo $clean['title']; ?></a></h1>
 <p class="weui-media-box__desc">规格：<span>红色</span>，<span>23</span></p>
 <p class="clear mg-t-10">
 <p class="wy-pro-pri fl">?<em class="num font-15 price"><?php echo $clean['price']; ?></em></p>
 <p class="pro-amount fr">
 <!-- 购买的数量 -->
 <input type="hidden" name="" class="datanum" value="<?php echo $clean['num']; ?>">
 <!-- 提交删除的数据 -->
 <input type="hidden" name="" class="rmdata" value="shopping.php?db=<?php echo $clean['db']; ?>&id=<?php echo $clean['id'];?>">
 <p class="Spinner"></p>
 </p>
 </p>
 </p>
 </p>
 </p>


 </p>
 </p>
 <?php }
 ?>

删除选中的商品

// echo '<pre>';// print_r($_SESSION['gwc']);// echo '</pre>';if(isset($_GET['db']) && isset($_GET['id'])){
 $dataArr = $_SESSION['gwc'];
 foreach ($dataArr as $key => $value) {
 if($value['db'] == $_GET['db'] && $value['id'] == $_GET['id']){
 unset($dataArr[$key]);
 }
 }
 $_SESSION['gwc'] = $dataArr;
 header("Location:shopping.php");}// echo '<pre>';// print_r( $dataArr);// echo '</pre>';

金额计算

 <!-- 金额计算 -->
 <script>
 window.onload = function() {
 var cartproAll = document.querySelectorAll('input[name=cartpro]');	
 var datanum = document.querySelectorAll('.datanum'); 
 var numAll = document.querySelectorAll('.Amount');
 var DisDe = document.querySelectorAll('.DisDe');
 var Increase = document.querySelectorAll('.Increase');

 // 购买数量的多少
 numAll.forEach((item,i) => {
 item.value = datanum[i].value;
 })

 // 点击加号
 DisDe.forEach((item, i) => {
 item.onclick = function() {
 computedPrice();
 }
 })
 // 点击减号
 Increase.forEach((item, i) => {
 item.onclick = function() {
 computedPrice();
 }
 })
 // 点击单选时计算金额
 cartproAll.forEach((item, i) => {
 item.onclick = function() {
 computedPrice();
 }
 })
 }
 function computedPrice(){
 var cartproAll = document.querySelectorAll('input[name=cartpro]'); //获取是否点击
 var price = document.querySelectorAll('.price'); //价钱
 var price_total = document.querySelector('.price_total'); //价钱总数 
 var numAll = document.querySelectorAll('.Amount'); //数量
 var total = 0;
 price_total.innerHTML = 0;
 cartproAll.forEach((item, i) => {
 if (item.checked == true) {
 total += parseFloat(price[i].innerHTML) * parseFloat(numAll[i].value);
 }
 })
 price_total.innerHTML = total;
 }
 </script>