CREATE TABLE `sp_sign` (
 `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵',
 `times` datetime DEFAULT NULL COMMENT '最近一次簽到時間',
 `userid` int(11) DEFAULT NULL COMMENT '用戶id',
 `days` tinyint(6) NOT NULL DEFAULT '0' COMMENT '連續(xù)簽到的天數(shù)',
 `number` decimal(10,0) NOT NULL DEFAULT '0' COMMENT '當月簽到給的積分',
 `one` varchar(255) DEFAULT NULL COMMENT '當月簽到的日期，用“，”隔開',
 `two` varchar(255) DEFAULT NULL COMMENT '上個月簽到的日期，用“，”隔開',
 `three` varchar(255) DEFAULT NULL COMMENT '上上個月簽到的日期，用“，”隔開',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/**
   * 用戶簽到
   * @param array $userid 用戶id
   */
  public function add($userid)
  {
      $data = Db::name('sign')->where('userid',$userid)->select();
      if(count($data) == 0) //沒有該用戶的簽到記錄
      {
        $query4 = Db::name('sign')->insert(['times'=>date('Y-m-d H:i:s'),'userid'=>$userid,'days'=>1,'number'=>'15','one'=>date('d',time())]);
        return 1;
      }
      else
      {
        //判斷今天是否簽到
        $todayBegin=date('Y-m-d'." 00:00:00");
        $todayEnd= date('Y-m-d'." 23:59:59");
        $isexit = Db::name('sign')->field('times')->where(['userid'=>$userid])->where('times','between',[$todayBegin,$todayEnd])->select();
        if(count($isexit) == 1)  //今日已簽到
        {
          return 0;
        }
        else  //今日未簽到
        {
          $times = Db::name('sign')->where('userid',$userid)->field('times')->select();
          $time = strtotime($times[0]['times']);
 
          if((time()-$time > 24*60*60))    //上次簽到時間大于24小時，連續(xù)簽到天數(shù)清零
          {
            $query = Db::name('sign')->where('userid',$userid)->update(['days'=>1]);
          }
          else   //上次簽到時間小于24小時，連續(xù)簽到次數(shù)加1
          {
            $query = Db::name('sign')->where('userid',$userid)->setInc('days');
          }
          //更新上次簽到時間和簽到積分
          $query1 = Db::name('sign')->where('userid',$userid)->update(['times'=>date('Y-m-d H:i:s')]);
          $query2 = Db::name('sign')->where('userid',$userid)->setInc('number', 15);
 
          $sqldate = date('m',$time);  //上次簽到日期的月份
          $nowdate = date('m',time()); //當前月份
          //記錄本次簽到日期
          if($sqldate != $nowdate) //上次簽到日期與本次簽到日期月份不一樣
          {
            $oldtime = $times[0]['times'];
            $onetime=date("Y-m-d H:i:s", strtotime("-1 month")); //獲取前1個月的時間，獲取格式為2016-12-30 13:26:13
            $twotime=date("Y-m-d H:i:s", strtotime("-2 month")); //獲取前2個月的時間
            $threetime=date("Y-m-d H:i:s", strtotime("-3 month")); //獲取前3個月的時間
 
            $rs = Db::name('sign')->where('userid',$userid)->field('one,two,three')->select();
 
            if($oldtime  $onetime  $oldtime >= $twotime)   //月份間隔 大于1個月，小于2個月
            {
              $one = date('d',time());
              $two = $rs[0]['one'];
              $three = $rs[0]['two'];
            }
            elseif($oldtime  $twotime  $oldtime >= $threetime) //月份間隔 大于2個月，小于3個月
            {
              $one = date('d',time());
              $two = '';
              $three = $rs[0]['one'];
            }
            elseif($oldtime  $threetime) //月份間隔 大于3個月
            {
              $one = date('d',time());
              $two = '';
              $three = '';
            }
            $query3 = Db::name('sign')->where('userid',$userid)->update(['one'=>$one,'two'=>$two,'three'=>$three]);
          }
          else //上次簽到日期與本次簽到日期月份一樣
          {
            $one = Db::name('sign')->where('userid',$userid)->field('one')->select();
            $arr[] = $one[0]['one'];
            $arr[] = date('d',time());
            $newones = implode(",",$arr);
            $query3 = Db::name('sign')->where('userid',$userid)->update(['one'=>$newones]);
          }
        return 1;
        }
      }
  }