这段签到代码有问题吗

<?php
public function sign(){
        //每日签到       
        $this->check_login();
        
        $m_time=$this->getMillisecond();
        $con['si_time']=array('gt',date('Y-m-d'));
                $ranking=M('sign')->where($con)->count();
                if($ranking){
                    $haha=intval($ranking);
                    switch ($haha){
                        case 1:
                          $pm=5;//给5块
                          $row=2;
                          $ch="亚军";
                          break;
                        case 2:
                          $pm=3;//给两块
                          $row=2;
                          $ch="季军";
                          break;
                        default:
                          $pm=0;
                        }
                }else{
                    $pm=10;//给10块赠金券
                    $row=1;
                    $ch="冠军";
                }
                if($pm>0){
                    $this->insertGiveCoupon($this->memberID,$pm);
                    $memo="<br>您是今天的签到{$ch},成功领取{$pm}赠金券";
                }
        $dao=M('sign');//实例化sign对象
        $current=date('Y-m-d H:i:s',time());
        $hasSign=$dao->where("userId={$this->memberID}")->find();
        $count=$hasSign['si_count'];
        

        //查找会员名
        $member=M('Members');
        $where['id']=$this->memberID;
        $memberName=$member->where($where)->field('name')->find();
        //$this->membername=$memberName['name'];
                
        $this->uid=$this->memberID;
        //如果执行成功
        if($hasSign){
            $lastSignDay=strtotime("{$hasSign['si_time']}");
            $lastSign=date('Y-m-d',$lastSignDay);
            $today=date('Y-m-d',time());
             if($lastSign==$today){
                //echo "今天已签到,您已连续签到 <font color='green'> {$count} </font> 天,连续签到5天每天+5元代金券!";
                $this->ajaxReturn('', "今天已签到!", 0);exit();
            } 
                
            $residueHour=24+24-date('H',$lastSignDay); //有效的签到时间  (签到当天剩余的小时+1天的时间)
            $formatHour=strtotime(date('Y-m-d H',$lastSignDay).':00:00');//签到当天 2014-12-07 18:00:00
            $lastSignDate=strtotime("+{$residueHour}hour",$formatHour);//在2014-12-07 18:00:00 基础上+ 有效的签到时间
            if(time()>$lastSignDate){ //当前时间 >  上一次签到时间
                $count=1;  
            }else{
                $count=$count+1;
            }
            $sign=$dao->where("userId={$this->memberID}")->save(array('si_time'=>$current,'si_count'=>$count,'m_second'=>$m_time)); //签到表
        }else{
            $sign=$dao->add(array('userId'=>$this->memberID,'si_count'=>1,'si_time'=>$current,'m_second'=>$m_time)); //签到表
            $count=1;
        }
        if($sign){
                    
            
            //第一天签到+1 第二天签到+2 第三天签到+3 第四天签到+4 第五天+5 连续5天每天+5
            switch ($count){
                case 1:
                  $sc_score=1;
                  break;
                case 2:
                  $sc_score=2;
                  break;
                case 3:
                  $sc_score=3;
                  break;
                case 4:
                  $sc_score=4;
                  break;
                default:
                  $sc_score=5;
                }
                                
                $dao->where("userId={$this->memberID}")->setInc('coin',$sc_score);  //签到金额累加
                $coin=$dao->where("userId={$this->memberID}")->field('coin')->find();
                if($coin['coin']>=20){
                    $dao->where("userId={$this->memberID}")->setDec('coin',20);//如果满20将生成一张20的代金券
                    $this->insertCoupon('会员签到代金券',20,$this->memberID);
                }
                $data=array(
                'userId'=>$this->memberID,    
                'sc_score'=>$sc_score,    
                'sc_detail'=>'签到+'.$sc_score,    
                'sc_type'=>1    
                );
            
            M('score')->add($data); //积分表
                        
            if($count>0){
               $this->ajaxReturn('', "签到成功！您已签到，成功领取{$sc_score}元代金券！{$memo}", 1);exit();
            }else{
               $this->ajaxReturn('', "您已签到！", 1);exit();
            }
        
        }else{
            $this->ajaxReturn('', "签到失败,请稍后重试！", 0);exit();
        }
        
    }

    //私有方法，生成代金券
    private function insertCoupon($name,$amount,$mid){
        
                    $data['name']=trim($name);

                    $data['amount']=$amount;

                    $data['coupon'] = array();

                    $data['coupon']=md5(uniqid(md5(microtime(true)),true));

                    $data['start_time']=time();

                    $data['expire_time']=strtotime("+2 year");

                    $data['dateline']=time();

                    $data['status']=1;

                    $data['user_id']=$mid;
                    
                    M('coupon')->add($data);

    }
//私有方法，生成赠金券
        private function insertGiveCoupon($mid,$amount){
            $map['user_id']=$mid;
            $map['status']=1;
            $res=M('givecoupon')->where($map)->find();
            if($res){
                M('givecoupon')->where($map)->setInc('amount',$amount);
            }else{
                
                    $data['name']='赠金券';

                    $data['amount']=$amount;

                    $data['coupon'] = array();

                    $data['coupon']=md5(uniqid(md5(microtime(true)),true));

                    $data['start_time']=time();

                    $data['expire_time']=strtotime("next year");

                    $data['dateline']=time();

                    $data['status']=1;

                    $data['user_id']=$mid;

                    M('givecoupon')->add($data);
            }

                    
    }

---

楼主代码都没有贴全！
而且就算贴全了，你这变量名称估计大家也懒得看！