ThinkPHP中获得上下篇文章的函数

ThinkPHP中获得上下篇文章的函数，大家可以参考一下方法，稍微修改下就可以应用到其他网站上，方法一样！

//取得上下篇文章function PrevNext($id, $name = '', $where = array(), $fields = 'id,title'){$array = array();$model = M($name);$map = array();$map = $where;$map['id'] = array('lt',$id);$prevL = $model->field($fields)->where($map)->order('id desc')->find(); //上篇if(!$prevL){$prevL['id'] = '';$prevL['title'] = '暂无';}$map['id'] = array('gt',$id);$nextL = $model->field($fields)->where($map)->order('id asc')->find(); //下篇if(!$nextL){$nextL['id'] = '';$nextL['title'] = '暂无';}$array['prev'] = $prevL;$array['next'] = $nextL;return $array;}