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>