; <div class="col-md-6"> <h2 class="text-center">已选择的商品</h2> <?php $total = 0; $output = ""; $output .= " <table class='table table-bordered table-striped'> <tr> <th>ID</th> <th>商品名称</th> <th>商品价格</th> <th>商品数量</th> <th>总价格</th> <th>操作</th> </tr> "; if(!empty($_SESSION['cart'])){ foreach($_SESSION['cart'] as $key => $value){ $output .= " <tr> <td>".$value['id']."</td> <td>".$value['name']."</td> <td>".$value['price']."</td> <td>".$value['quantity']."</td> <td>$".number_format($value['price'] * $value['quantity'])."</td> <td> <a href='cart-item.php?action=remove&id=".$value['id']."'> <button class='btn btn-danger btn-block'>移除</button> </a> </td> </tr> "; $total = $total + $value['quantity'] * $value['price']; }$output .= " <tr> <td colspan='3'></td> <td></b>总价格</b></td> <td>".number_format($total, 2)."</td> <td> <a href='cart-item.php?action=clearall'> <button class='btn btn-warning btn-block'>清空</button> </a> </td> </tr> "; } echo $output; ?> </div> </div> </div> </div> </body> </html></pre> <p>我多次检查了数量数组键并与视频进行比较，与视频中的相同。我还应该尝试什么其他的东西吗？数据库中的表格也没有包含数量</p>