$jifen=M('jifen');
$sess_userid=>$_SESSION[C('USER_AUTH_KEY')];
$today_a = date('Y-m-d 00:00:00',time());
$today_b = date('Y-m-d 00:00:00',strtotime('+1 days'));
$tubiao=$jifen->where('userid='.$sess_userid.' and createtime >=\''.$today_a.'\' and createtime<=\''.$today_b.'\'')->sum(num);
$this->assign('tubiao',$tubiao);