Custom "Who's Online" block

This is a customization of the "Who's Online" block. This one just adds the total number of registered users in addition to telling who is online.

Snippet:

<?php
in template.php:
function onlineuser_count(){
    $number = db_result(db_query('SELECT COUNT(uid) AS number FROM {users} WHERE status=1'));
    if (user_access('access content')) {
        // Count users with activity in the past defined period.
        $time_period = variable_get('user_block_seconds_online', 900);
       
        // Perform database queries to gather online user lists.
        $guests = db_fetch_object(db_query('SELECT COUNT(sid) AS count FROM {sessions} WHERE timestamp >= %d AND uid = 0', time() - $time_period));
        $users = db_query('SELECT uid, name, access FROM {users} WHERE access >= %d AND uid != 0 ORDER BY access DESC', time() - $time_period);
        $total_users = db_num_rows($users);
       
        // Format the output with proper grammar.
        echo "Out of $number registered users ";
        if ($total_users == 1 && $guests->count == 1) {
            $output = t('%members and %visitors online.', array('%members' => format_plural($total_users, 'there is currently 1 user', 'there are currently @count users'), '%visitors' => format_plural($guests->count, '1 guest', '@count guests')));
        } else {
            $output = t('there are currently %members and %visitors online.', array('%members' => format_plural($total_users, '1 user', '@count users'), '%visitors' => format_plural($guests->count, '1 guest', '@count guests')));
        }
        // Display a list of currently online users.
        $max_users = variable_get('user_block_max_list_count', 10);
        if ($total_users && $max_users) {
            $items = array();
            while ($max_users-- && $account = db_fetch_object($users)) {
                $items[] = $account;
            }
            $output .= theme('user_list', $items, t('Online users'));
        }
    }
    return $output;
}
?>

in page.tpl, node.tpl or block.tpl:
<?php print onlineuser_count() ?>