解决思路就是 把 ({$InfoNum[$key_3]})  循环相加 就可以了

在我模板中 代码如下

<dl class="index_side_nav"> 
<dt class="head"><div class="fname"><strong>信息分类导航</strong></div></dt> 
<dd class="con">
<!-- 
EOT; 
$i=0; 
foreach($Fid_db[0] AS $key_2=>$rs){ 
$i++; 
$Num=0; 
$InfoNum[$key_2]=intval($InfoNum[$key_2]); 
$url=get_info_url('',$key_2,$city_id); 
print <<<EOT 
-->
<div class="nav_sort"> 
<p class="nav_sort_big"><span class="nav_num">$i</span><span class="fname"><a href="$url"><strong>{$Fid_db[name][$key_2]}</strong></a></span><span class="fnum" id="fnum{$i}"></span></p> 
<ul class="nav_sort_big_min"> 
<!-- 
EOT; 
foreach($Fid_db[$key_2] AS $key_3=>$rs){ 
$InfoNum[$key_3]=intval($InfoNum[$key_3]); 
$url=get_info_url('',$key_3,$city_id); 
$Fid_db[name][$key_3] = get_word($Fid_db[name][$key_3],25); 
print <<<EOT 
-->
<li><a href="$url">{$Fid_db[name][$key_3]}</a></li> 
<!-- 
EOT; 
for($j=0;$j<count($key_3);$j++)$Num+=$InfoNum[$key_3]; 
}print <<<EOT 
--></ul> 
</div> 
<script type="text/java script"> 
document.getElementById("fnum{$i}").innerHTML="( {$Num} )"; 
</script> 
<!-- 
EOT; 
}print <<<EOT 
-->
</dd> 
</dl>

以上数据只会显示在每个的下面，若您会CSS 和 JS 就能定位挪动到 大分类名称后面来显示