用更简单的方式构建无序列表导航菜单-代码美化问题

我写了一个动态菜单基于三个表在db上反映以下层次框架:

> Section
>> Categories
>>> Subcategory

include("connDB.php");
echo '<ul>';
$q1 = mysql_query("SELECT * FROM section ORDER BY section_name ASC");
while($getSection = mysql_fetch_array($q1)) {
    echo "<li><a href='content.php?sec={$getSection['section_id']}&cat='>{$getSection['section_name']}</a>";
    $q2 = mysql_query("SELECT * FROM category WHERE section_id = '{$getSection['section_id']}'");
    if(mysql_num_rows($q2) > 0) {
        echo "<ul>";
        while($getCat = mysql_fetch_array($q2)) {
            echo "<li><a href='content.php?sec={$getSection['section_id']}&cat={$getCat['category_id']}&scat='>{$getCat['category_name']}</a>";
            $q3 = mysql_query("SELECT * FROM subcategory WHERE category_id = '{$getCat['category_id']}'");
            if(mysql_num_rows($q3) > 0) {
                echo "<ul>";
                while($getSubCat = mysql_fetch_array($q3)) {
                    echo "<li><a href='content.php?sec={$getSection['section_id']}&cat={$getCat['category_id']}&scat={$getSubCat['subcategory_id']}&getDetail='>{$getSubCat['subcategory_name']}</a></li>";
                }
                echo "</ul>";
                echo "</li>";
            }
        }
        echo "</ul>";
        echo "</li>";
    }
}
echo '</ul>';

我想知道我是否能找到任何帮助来美化这个基本级别的代码，以更好的方式，更专业的方式?谢谢你的帮助。