PHP Code:
<?php
require('./global.php');
$numbersmembers=$DB_site->query_first('SELECT COUNT(*) AS users,MAX(userid) AS max FROM user');
$getnewestusers=$DB_site->query_first("SELECT userid,username FROM user WHERE userid=$numbersmembers[max]");
$newusername=$getnewestusers['username'];
$newuserid=$getnewestusers['userid'];
print "<a href='$bburl/member.php?s=$sessionhash&action=getinfo&userid=$newuserid'>$newusername</a>";
?>
Try that