Shouldn't this?
PHP Code:
$getnewestusers=$DB_site->query_first("SELECT userid,username FROM user WHERE usergroupid=2 AND userid>".($numbersmembers[max]-100). " ORDER BY userid DESC, LIMIT 1");
actually be this?
PHP Code:
$getnewestusers=$DB_site->query_first("SELECT userid,username FROM user WHERE usergroupid=2 AND userid>".($numbersmembers[max]-100). " ORDER BY userid DESC LIMIT 1");
The comma between the DESC and LIMIT will give you a db error.