/** * 获取分页数据及总条数 * @param string @tablename 表名 * @param mixed $where 条件 * @param int $limit 每页条数 * @param int $offset 当前页 * */ public function get_page_data($tablename, $where, $limit, $offset, $order_by, $db) {         if(empty($tablename))         {             return FALSE;         }                 $dbhandle = empty($db) ? $this->db : $db;                 if($where)         {             if(is_array($where))             {                 $dbhandle->where($where);             }             else             {                 $dbhandle->where($where, NULL, false);             }         }                 $db = clone($dbhandle);         $total = $dbhandle->count_all_results($tablename);                 if($limit)         {             $db->limit($limit);         }                 if($offset)         {             $db->offset($offset);         }                 if($order_by)         {             $db->order_by($order_by);         }                 $data = $db->get($tablename)->result_array();                 return array('total' => $total, 'data' => $data); }