Счетчик посетивших за день пользователей

<?php
if(!defined('DATALIFEENGINE')){
    die("Hacking attempt!");
}
include ENGINE_DIR . '/data/zu_visited_config.php';
if( ! $tpl->result['lastusers'] ) {
    $today = mktime(0,0,0,date('m'),date('d'),date('Y'));//с начала дня
    $row = $db->query("SELECT * FROM " . USERPREFIX . "_users WHERE lastdate > '$today' ORDER BY lastdate DESC LIMIT 0,30");
    while ( $row = $db->get_row() ) {
        /* foto */
        if ($row['foto'] !== "")
            $foto = "{$config['http_home_url']}uploads/fotos/{$row['foto']}";
        else
            $foto = "{$config['http_home_url']}templates/{$config['skin']}/images/noavatar.png";
        /* foto */
        $zcolor = $zu_visited_config['group' . $row['user_group'] . '_color'];
        /* Ссылка на профиль юзера */
        if($config['allow_alt_url'] == "yes")
            $go_page = $config['http_home_url'] . "user/" . urlencode( $row['name'] ) . "/";
        else
            $go_page = "$PHP_SELF?subaction=userinfo&amp;user=" . urlencode( $row['name'] );
        if($row['is_register'] == 1){
            if( $config['allow_alt_url'] == "yes" )
                $go_page = $config['http_home_url'] . "user/" . urlencode( $row['name'] ) . "/";
            else
                $go_page = "$PHP_SELF?subaction=userinfo&amp;user=" . urlencode( $row['name'] );
        }
        else {
            $author = "<a onclick=\"ShowProfile('" . urlencode( $row['name'] ) . "', '" . $go_page . "'); return false;\" href=\"" . $go_page . "\"><span style='color:{$zcolor}'><b>{$row['name']}</b></span></a>";
        }
        if($row['is_register'] != 1)
            $author = "<a onclick=\"ShowProfile('" . urlencode( $row['name'] ) . "', '" . $go_page . "'); return false;\" href=\"" . $go_page . "\"><span style='color:{$zcolor}'><b>{$row['name']}</b></span></a>";
        /* Ссылка на профиль юзера */

        $tpl->load_template('zu_visited_skin.tpl');
        $tpl->set('{group_name}', $user_group[$row['user_group']]['group_prefix'].$user_group[$row['user_group']]['group_name'].$user_group[$row['user_group']]['group_suffix'] );
        $tpl->set('{foto}', $foto);
        $tpl->set('{author}', $author);
        $tpl->set('{reg_date}', langdate( "j F Y H:i", $row['reg_date']));
        $tpl->set('{lastdate}', langdate( "H:i", $row['lastdate']));
        $tpl->set('{news-num}', $row['news_num']);
        $tpl->set('{comm-num}', $row['comm_num']);
        $tpl->compile('lastusers');
        $tpl->clear();
    }
    $db->free();
    if("on") {
        echo "<h2>Сегодня сайт посетили: ".(count(explode($author, trim($author)))-1)." человек</h2><hr>";
        echo $tpl->result['lastusers'];
    }
}
?>