删除无限分类并同时删除它下面的所有子分类的方法

$act = isset ($_GET[act]) ? trim ($_GET[act]) : ";
if ($act == del)
{
$sort_id = isset ($_GET[id]) ? intval($_GET[id]) : 0 ;
$sort_ids = $sort_id;
$childrenIds = getChildrenIds ($sort_id);
if (!empty ($childrenIds))
{
$sort_ids .= $childrenIds;
}
$sql = “delete from `article_sort` WHERE `sort_id` in ({$sort_ids})";
$res = mysql_query ($sql);
if ($res)
{
alert (删除成功);
exit;
}
else
{
alert (删除失败);
exit;
}
}

/*—————————————————— */
//– 获取无限分类ID下面的子类ID集
//– $sort_id = $sort_id.getChildrenIds($sort_id);
//– $sql = " ….. where sort_id in ($sort_id)";
/*—————————————————— */
function getChildrenIds ($sort_id)
{
global $db;
$ids = ";
$sql = "SELECT * FROM ".$db->table(article_sort)." WHERE `parent_id` = {$sort_id}";
$res = $db->query ($sql);
if ($res)
{
while ($row = $db->fetch_assoc ($res))
{
$ids .= ,.$row[sort_id];
$ids .= getChildrenIds ($row[sort_id]);
}
}
return $ids;
}