Arkadaşlar onarcade script kurulu sitemde üye listesi üye adına göre sıralanıyor.Ben son üye olma tarihine göre sıralanmasını istiyorum.Rica etsem kodlarda yapılması gereken degişiklikleri belirtirmisiniz.Sayfa kodları aşagıdadır.

<?php
if ($userStatus != '1' || $userGroup != '2' || !isset($_SESSION['userid'])) {
    header ("Location: login.php");
    exit();
}
?>
<center>
  <a href="index.php?action=adduser">Kullanici Ekle </a>
</center><br />

<table style="border: 0px; font-size: 12px; font-family: Arial; width: 100%;">
<?php if ($error == '1') { ?>
  <tr>
  <td align="center" colspan="4"><font color="red"><b>Yeni kullanici eklendi !</b></font></td>
  </tr>
<?php } elseif ($error == '2') {?>
  <tr>
  <td align="center" colspan="4"><font color="red"><b>Kullanici silindi !</b></font></td>
  </tr>
<?php } 
  
$users_result = mysql_query("SELECT userid FROM users");
$usersperpage = "50";
$numrows = mysql_num_rows($users_result);
$offset = ($page - 1) * $usersperpage;
$pagescount = ceil($numrows/$usersperpage);
for ($pagen = 1; $pagen <= $pagescount; $pagen++) {
    if ($pagen == $page) {
        $nav .= " <b>$pagen</b>";
    } else {
        $nav .= " <a href=\"index.php?action=users&order=".$order."&page=".$pagen."\">".$pagen."</a>";
    } 
}
if ($page > 1) {
    $pagen = $page - 1;
    $prev = " <a href=\"index.php?action=users&order=".$order."&page=".$pagen."\"><</a>";
} else {
    $prev  = "";
}
if ($page < $pagescount) {
    $pagen = $page + 1;
    $next = " <a href=\"index.php?action=users&order=".$order."&page=".$pagen."\">></a>";
} else {
    $next = "";
}
echo "<tr><td align='center' colspan='6' style='font-size: 11px;'>".$prev.$nav.$next."</td></tr>";

?>
  <tr>
  <td align="center"><a href="index.php?action=users&order=1" class="order">Kullanci adi </a></td>
  <td align="center"><a href="index.php?action=users&order=2" class="order">Durum</a></td>
  <td align="center"><a href="index.php?action=users&order=3" class="order">Grup</a></td>
  <td></td>
  </tr>
<?php
$euserStatusName = array(
    "1" => "<font color=\"green\">Active</font>",
    "2" => "<font color=\"red\">Banned</font>",
    "0" => "<font color=\"#FF6103\">Unconfirmed</font>"
);
$euserGroupName = array(
    "2" => "<font color=\"#FF6103\">Administrator</font>",
    "1" => "Member"
);
$usernr = "0";
$users_result = mysql_query("SELECT * FROM users ORDER BY $orderby LIMIT $offset, $usersperpage");
if (mysql_num_rows($users_result)) {
while($row = mysql_fetch_array($users_result)) {
        $euserid = $row['userid'];
        $eusername = $row['username'];
        $euserstatus = $row['status'];
        $eusergroup = $row['usergroup'];
        if ($usernr == '0') {
            $rowbgcolor = "#A4D3EE";
            $usernr = "1";
        } else {
            $rowbgcolor = "#FFFFFF";
            $usernr = "0";
        }
?>
  <tr bgcolor="<?php echo $rowbgcolor; ?>">
  <td><?php echo $eusername; ?></td><td align="center"><?php echo $euserStatusName[$euserstatus]; ?></td><td align="center"><?php echo $euserGroupName[$eusergroup]; ?></td>
  <td align="center"><a href="index.php?action=edituser&userid=<?php echo $euserid; ?>">Düzenle</a>- <?php if ($eusergroup == '2') { echo "<font color='#003366'>Delete</font>"; } else {?><a onclick='return confirmDelete()' href="index.php?action=deleteuser&userid=<?php echo $euserid; ?>">Sil</a><?php } ?></td>
  </tr>
<?php
}
}
?>
</table>

Teşekkürler arkadaşlar.