购物车项目从opencart中删除显示未定义

Question

<div id="cart" class="top-cart">
      <button type="button" data-toggle="dropdown" data-loading-text="<?php echo $text_loading; ?>" class="btn btn-link btn-header btn-lg dropdown-toggle"> <i class="fa fa-shopping-basket"></i>Cart<span id="cart-total"><?php echo $text_items; ?></span></button>
      <ul class="dropdown-menu">
        <?php if ($products || $vouchers) { ?>
        <li>
          <table class="table table-striped">
            <?php foreach ($products as $product) { ?>
            <tr>
              <td class="text-center"><?php if ($product['thumb']) { ?>
                <a href="<?php echo $product['href']; ?>"><img src="<?php echo $product['thumb']; ?>" alt="<?php echo $product['name']; ?>" title="<?php echo $product['name']; ?>" class="img-thumbnail" /></a>
                <?php } ?></td>
              <td class="text-left"><a href="<?php echo $product['href']; ?>"><?php echo $product['name']; ?></a>
                <?php if ($product['option']) { ?>
                <?php $sum=0; foreach ($product['option'] as $option) { ?>
                <br />
                - <small><?php echo $option['name']; ?> <?php echo $option['value']; ?>
                <?php $opprice = $option['price']; echo $opprice;  ?></small>
                <?php $sum += $option['price']; ?>
                <?php } ?>

                <?php } ?>
                <?php if ($product['recurring']) { ?>
                <br />
                - <small><?php echo $text_recurring; ?> <?php echo $product['recurring']; ?></small>
                <?php } ?></td>
              <td class="text-right">x <?php echo $product['quantity']; ?></td>
              <td class="text-right"><?php echo $product['total']; ?></td>
              <td class="text-center"><button type="button" onclick="cart.remove('<?php echo $product['key']; ?>');" title="<?php echo $button_remove; ?>" class="btn btn-default btn-xs"><i class="fa fa-times"></i></button></td>
            </tr>
            <?php } ?>
            <?php foreach ($vouchers as $voucher) { ?>
            <tr>
              <td class="text-center"></td>
              <td class="text-left"><?php echo $voucher['description']; ?></td>
              <td class="text-right">x&nbsp;1</td>
              <td class="text-right"><?php echo $voucher['amount']; ?></td>
              <td class="text-center text-danger"><button type="button" onclick="voucher.remove('<?php echo $voucher['key']; ?>');" title="<?php echo $button_remove; ?>" class="btn btn-danger btn-xs"><i class="fa fa-times"></i></button></td>
            </tr>
            <?php } ?>
          </table>
        </li>
        <li>
          <div>
            <table class="table table-bordered">
              <?php foreach ($totals as $total) { ?>
              <tr>
                <td class="text-right"><strong><?php echo $total['title']; ?></strong></td>
                <td class="text-right"><?php echo $total['text']; ?></td>
              </tr>
              <?php } ?>
            </table>
            <p class="text-right"><a href="<?php echo $cart; ?>"><strong><i class="fa fa-shopping-basket"></i> <?php echo $text_cart; ?></strong></a>&nbsp;&nbsp;&nbsp;<a href="<?php echo $checkout; ?>"><strong><i class="fa fa-share"></i> <?php echo $text_checkout; ?></strong></a></p>
          </div>
        </li>
        <?php } else { ?>
        <li>
          <p class="text-center"><?php echo $text_empty; ?></p>
        </li>
        <?php } ?>
      </ul>
    </div>

这是我的购物车页面..当我添加物品以进行精细工作时以及当我尝试从购物车中移除物品时，它在购物车标题处显示未定义..

 <button type="button" data-toggle="dropdown" data-loading-text="<?php echo $text_loading; ?>" class="btn btn-link btn-header btn-lg dropdown-toggle"> <i class="fa fa-shopping-basket"></i>Cart<span id="cart-total"><?php echo $text_items; ?></span></button>

从购物车中移除物品时显示未定义我需要按照按钮显示默认购物车....