根据当前分类id取父类名

function getParentName($id){
    $list   =   array();
    $result   =   M('category')->where(array('category_id'=>$id))->Field('parent,name')->find();
    if($result['parent']!=0){
        $list[] = $result['name'];
        $list = array_merge($list,getParentName($result['parent']));
    }
    return array_reverse($list);
}