dropdown-submenu 에 관련해 질문드립니다.

<ul>    <?php    // 1단계 분류 판매 가능한 것만    $hsql = " select ca_id, ca_name from {$g5['g5_shop_category_table']} where length(ca_id) = '2' and ca_use = '1' order by ca_order, ca_id ";    $hresult = sql_query($hsql);    $gnb_zindex = 999; // gnb_1dli z-index 값 설정용    for ($i = 0; $row = sql_fetch_array($hresult); $i++) {        $gnb_zindex -= 1; // html 구조에서 앞선 gnb_1dli 에 더 높은 z-index 값 부여        // 2단계 분류 판매 가능한 것만        $sql2 = " select ca_id, ca_name from {$g5['g5_shop_category_table']} where LENGTH(ca_id) = '4' and SUBSTRING(ca_id,1,2) = '{$row['ca_id']}' and ca_use = '1' order by ca_order, ca_id ";        $result2 = sql_query($sql2);        $count = sql_num_rows($result2);        ?>        <li class="dropdown">            <a href="<?php echo G5_SHOP_URL . '/list.php?ca_id=' . $row['ca_id']; ?>"><?php echo $row['ca_name']; ?></a>        <?php        for ($j = 0; $row2 = sql_fetch_array($result2); $j++) {            // 3단계 분류 판매 가능한 것만            $sql3 = " select ca_id, ca_name from {$g5['g5_shop_category_table']} where LENGTH(ca_id) = '6' and SUBSTRING(ca_id,1,2) = '{$row['ca_id']}' and ca_use = '1' order by ca_order, ca_id ";            $result3 = sql_query($sql3);            $count3 = sql_num_rows($result3);            if ($j==0) echo '<ul class="dropdown-menu">';            ?>            <li class="dropdown-submenu">                <a href="<?php echo G5_SHOP_URL; ?>/list.php?ca_id=<?php echo $row2['ca_id']; ?>"><?php echo $row2['ca_name']; ?></a>                <?php                for ($aa = 0; $row3 = sql_fetch_array($result3); $aa++) {                    if ($aa==0) echo '<ul class="dropdown-menu">';                    ?>                    <li>                        <a href="<?php echo G5_SHOP_URL; ?>/list.php?ca_id=<?php echo $row3['ca_id']; ?>"><?php echo $row3['ca_name']; ?></a>                    </li>                <?php }                if ($aa > 0) echo '</ul>';                ?>            </li>            <?php }        if ($j > 0) echo '</ul>';        ?>        </li>    <?php } ?></ul>