//默认加入群组if($_SGLOBAL['supe_uid']){             $sql = "SELECT * FROM ".tname('mtag')." WHERE tagid=18"; //这个ID需要你修改成自己的默认群组的ID         $query = $_SGLOBAL['db']->query($sql);          $rs=($_SGLOBAL['db']->fetch_array($query));           if($rs) {           //如果有该群组            $tagid = $rs['tagid']; //先查找当前用户是否已经加入了该群组                 $sql = "SELECT * FROM `" .tname('tagspace'). "` WHERE tagid=$tagid AND uid=".$_SGLOBAL[supe_uid];                  $query = $_SGLOBAL['db']->query($sql);                   $found_user_tagspace=($_SGLOBAL['db']->fetch_array($query));                            if(!$found_user_tagspace) { //如果没有加入,                          $setarr=array('membernum'=>$rs['membernum']+1);//更新群组人数                           updatetable('mtag',$setarr,array('tagid'=>$tagid));                            unset($setarr);                          $setarr = array( 'tagid' => $tagid, 'uid' => $_SGLOBAL[supe_uid], 'username' => $_SGLOBAL[supe_username], 'grade' => 0 );                         $tagspaceid=inserttable('tagspace',$setarr,1); //加入群组                         }                                                  } }