f方法实现流水号功能，每天从001开始 得到的流水号为日期+三位数：20131011001
$fdate=f(fdate);
        $endtoday=mktime(0,0,0,date('m'),date('d')+1,date('y'))-1; 
        if($fdate['time'] != $endtoday)
            {$fdate['time']=$endtoday;
             $fdate['code']='1';
            }
        if($fdate['code']  999)
            {$fdate['code']='1';
            }
$date['orderstatus'] = '1';
        $date['orderno'] =date('ymd').str_pad($fdate['code'],3,0,str_pad_left);
        $fdate['code'] =$fdate['code'] + 1;
        f(fdate,$fdate);
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