private static $_user_name_arr = [];
private function getUserNameByUid($uid)
{
   if(!isset(self::$_user_name_arr[$uid])){
       $user =  DB::name("user")->find();
       self::$_user_name_arr[$uid] = $user?$user['name']:'';
   }
   return self::$_user_name_arr[$uid];
}

static $locationtimes  = array();
public static function getLocationTimes($uid, $dayTime)
{
   if(!self::$locationtimes){
       $data = DB::name("user")->select();
       foreach ($data as $v) {
           self::$locationtimes[$v['uid']][]=$v;
       }
   }
   return isset(self::$locationtimes[$uid])?self::$locationtimes[$uid]:[];
}