php用数组返回无限分类的列表数据的代码

/*—————————————————— */
//– 获取无限分类的列表数据
/*—————————————————— */
function get_sort ($parent_id=0,$n=-1)
{
global $db;
static $sort_list = array ();
$sql = "SELECT * FROM ".$db->table(article_sort)." WHERE `parent_id` = {$parent_id}";
$res = $db->query ($sql);
if ($res)
{
$n++;
while ($row = $db->fetch_assoc ($res))
{
$sql = "SELECT * FROM ".$db->table(article_sort)." WHERE `parent_id` = {$row[sort_id]}";
$children = $db->num_rows ($sql);
$row[sort_name] = str_repeat ( ,$n*4).$row[sort_name];
$row[children] = $children;
$sort_list[] = $row;
get_sort ($row[sort_id],$n);
}
}
return $sort_list;
}