php smarty 二级分类代码和模版循环例子

二级分类的数据表结构如下：

PHP代码如下 
/** 
@ 文章分类 含二级分类 
@ param int $rootnum -- 一级分类数量 
@ param int $childnum -- 二级分类数量 
@ 返回值 array 
@ date 2011.2.24 
*/ 
function temp_articletreecate($rootnum,$childnum){ 
if(!isnumber($rootnum)){ 
$rootnum = 10; 
} 
if(!isnumber($childnum)){ 
$childnum = 10; 
} 
$category = array(); 
$parent_sql = "SELECT cateid,catename FROM ".TABLE_PREFIX."articlecate WHERE parentid=0 AND depth=0 AND flag=1 ORDER BY orders ASC"; 
if(intval($rootnum)>0){ 
$parent_sql.=" LIMIT $rootnum"; 
} 
$parent_cate = $GLOBALS['db']->getall($parent_sql); 
foreach($parent_cate as $parent_key => $parent_value){ 
//子类数组名为 childcategory 根据情况自定义名称 
$category[] = array('cateid'=>$parent_value['cateid'],'catename'=>$parent_value['catename'],'childcategory'=>array()); 
//读取子类 
$child_sql = "SELECT cateid,catename FROM ".TABLE_PREFIX."articlecate WHERE parentid=".$parent_value['cateid']." AND flag=1 ORDER BY orders ASC"; 
if(intval($childnum)>0){ 
$child_sql.=" LIMIT $childnum"; 
} 
$child_cate = $GLOBALS['db']->getall($child_sql); 
foreach($child_cate as $child_key => $child_value){ 
$category[count($category)-1]['childcategory'][] = array('cateid'=>$child_value['cateid'],'catename'=>$child_value['catename']); 
} 
} 
return $category; 
}

PHP页面调用分类，如index.php
$goodscatetree = array();
$goodscatetree = temp_goodstreecate(4,0); //调用分类函数（含二级分类）4--表示一级分类只显示4个，0--表示二级分类不限数量
$tpl>assign("goodscatetree",$goodscatetree); //执行smarty引擎
$tpl->display->(index.tpl); //输出smarty模版页面

TPL模版页面输出分类，如index.tpl页面
{section name=p loop=$goodscatetree}
一级分类：{$goodscatetree[p].catename}
{section name=c loop=$goodscatetree[p].childcategory}
二级分类：{$goodscatetree[p].childcategory[c].catename}
{/section}
{/section}