首先打开根目录，打到品牌筛选的代码段

$brands_num=0;   
foreach ($brands AS $key => $val)   
{   
$temp_key = $key + 1;   
$brands[$temp_key]['brand_name'] = $val['brand_name'];   
$brands[$temp_key]['url'] = build_uri('category', array('ci
d' => $cat_id, 'bid' => $val['brand_id'], 'price_min'=>$pri
ce_min, 'price_max'=> $price_max, 'filter_attr'=>$filter_at
tr_str), $cat['cat_name']);   
/* 判断品牌是否被选中 */  
if ($brand == $brands[$key]['brand_id'])   
{   
$brands[$temp_key]['selected'] = 1;   
}   
else  
{   
$brands[$temp_key]['selected'] = 0;   
}   
$brands_num=$brands_num+1;   
} 

加入部分代码，然后赋值给模板

$smarty->assign('page_title', $position['title']); // 页面标题   
$smarty->assign('ur_here', $position['ur_here']); // 当前位置   
$smarty->assign('brands_num', $brands_num);  

最后在模板里使用 {$brands_num} 显示即可，顺便帖一下当前分类的品牌列表代码：

<!--{if $brands.1}-->   
<div class="goodsfl no_db">   
<div class="ht15"></div>   
<span>{$lang.brand}：</span>   
<ul class="sp_filter_li"><!--{foreach from=$brands item=brand}-->   
<li><a href="{$brand.url}" <!-- {if $brand.selected} --> class="d
q" <!-- {/if} --> > {$brand.brand_name}</a></li><!--{/foreach}-->    
</ul>   
<div class="ht5"></div>   
</div>   
<!--{/if}-->