zhangjingyu 
看sort.php这个文件，似乎想要把ip地址对应的地理位置保存起来并调用不太容易，不过也先看看吧。
“$onlinedb = openfile(D_P.'data/bbscache/online.php');”（引用内容）这里读取了缓存文件online.php。
            } else {
                $thread['username']    = $thread[0];
                $thread['uid']        = $thread[8];
                //$thread['ip']        = $thread[2];
                //可以查看在线统计ip地址的用户组21:16 2019-1-4
                //if(in_array($groupid,array(3,4,5))){$thread['ip']=$thread[2];}else {$thread['ip']="-";}
                $thread['ip']        = in_array($groupid,array(3,4,5)) ? $thread[2] : "-";
                //$thread['ip']        = S::inArray($windid,$manager) ? $thread[2] : "-";
                $thread['group']    = $ltitle[$thread[5]];
                $thread['action']    = $thread[6];
                $thread['lasttime']    = $thread[7];
                $forum[$thread[3]]['name'] && $thread['forum'] = "".$forum[$thread[3]]['name']."";
                $thread['atc'] = $thread[4];
            }
            $threaddb[] = $thread;
        }
    }
    require_once PrintEot('sort');footer();

} elseif ($action == 'member') {这里通过online.php得到了一些信息，简单对应下，可能不太准确。
0＝username
1＝timestamp
2＝ip
3＝fid
4＝tid
5＝groupid
6＝action
7＝lasttime
8＝uid

online.php文件内容简单如下：
zhangjingyu    1764990603    112.37.131.176    3    3779    3    论坛管理◇家园服务    12-06 11:10    2