list($list, $total) = call_user_func($this->_callback, $offset, $this->limit, $sql_order);
$page_max = intval(($total-1)/$this->limit);
list($list, $total) = call_user_func($this->_callback, $offset, $this->limit, $sql_order);
$page_max = intval(($total-1)/$this->limit);