thinkphp怎么实现累计

<html>
<head>
   <meta http-equiv="content-type" content="text/html;charset=utf-8">
         <title>浏览商品信息</title>
   </head>
   <body>
         <center>
         <h3>浏览我的购物车</h3><br/>
 <a href="__APP__/Index/index">浏览商品</a>
 <table border="1" width="600" cellspacing="0">
   <tr>
       <th>商品ID号</th><th>商品名称</th><th>商品图片</th><th>单价</th><th>数量</th><th>小计</th><th>操作</th>
   </tr>
   <assign name='num' value='0'>
   <foreach name='data' item='v'>
   <tr>
       <td><{$v.id}></td>
   <td><{$v.name}></td>
   <td><img src='__PUBLIC__/Uploads/thumb_<{$v.pic}>'</td>
   <td><{$v.price}></td>
   <td><{$v.num}></td>
   <td><{$v['price']*$v['num']}></td>
   <td><a href='__URL__/clearCart?id=<{$v.id}>'>删除</td>
                   
   </tr>
              
              </foreach>
  <tr>
    <td>总计金额</td>
<td colspan='5'><{$num+=$v['price']*$v['num']}></td>
<td></td>
  </tr>
           </table>

         </center>

   </body></html>

解决方案 »

  1.   

    <html>
    <head>
       <meta http-equiv="content-type" content="text/html;charset=utf-8">
             <title>浏览商品信息</title>
       </head>
       <body>
             <center>
             <h3>浏览我的购物车</h3><br/>
     <a href="__APP__/Index/index">浏览商品</a>
     <table border="1" width="600" cellspacing="0">
       <tr>
           <th>商品ID号</th><th>商品名称</th><th>商品图片</th><th>单价</th><th>数量</th><th>小计</th><th>操作</th>
       </tr>
       <assign name='num' value='0'>
       <foreach name='data' item='v'>
       <tr>
           <td><{$v.id}></td>
       <td><{$v.name}></td>
       <td><img src='__PUBLIC__/Uploads/thumb_<{$v.pic}>'</td>
       <td><{$v.price}></td>
       <td><{$v.num}></td>
       <td><{$v['price']*$v['num']}></td>
       <td><a href='__URL__/clearCart?id=<{$v.id}>'>删除</td>
                       
       </tr>
                 <php>$num+=$v['price']*$v['num'];</php> 
                  </foreach>
      <tr>
        <td>总计金额</td>
    <td colspan='5'><{$num}></td>
    <td></td>
      </tr>
               </table>         </center>   </body></html>
     
      

  2.   

    Action:
    foreach($arr as $v){
        $sum += $v['price'] * $v['num'];
    }
    $this->assign('sum',$sum);tpl
    {$sum}