动态二级列表php

Question

我知道，这可能超级简单，但是可能工作到很晚才停住了脑子……好吧。 这是我的PHP，它为我制作了两个级别的动态列表。 http://robertr.pastebin.com/K2XvruPr

<?
    $last = NULL;
    $query = "SELECT s.id AS sect_id, s.name AS sect_name, s.alias AS sect_alias, c.name AS cat_name, c.alias AS cat_alias
    FROM data_sections s, data_categories c
    WHERE s.id = c.section_id
    AND s.deleted = 0
    AND c.deleted = 0";
    echo "<ul>\n";
    $result = mysql_query($query);
    while($list = mysql_fetch_array($result)){

        if($last!=$list['sect_name']) {
            echo "<li>".$list['sect_name']."</li>\n";
            $last = $list['sect_name'];
        }
        echo "<ul>";
        echo "<li>".$list['cat_name']."</li>";
        echo "</ul>\n";
    }
    echo "</ul>";
    ?>

视图输出上的所有内容看起来都不错，但是源视图却不像我​​想要的。 robertr.pastebin.com/J7bPQeXj（在地址栏中复制粘贴）。

谁能帮助我理解，如何仅对所有类别一次而不是对每个类别制作这些第二级UL标签。

谢谢！

Answer 1

快速修复UNTESTED

<?
$last = NULL;
$query = "SELECT s.id AS sect_id, s.name AS sect_name, s.alias AS sect_alias, c.name AS cat_name, c.alias AS cat_alias
FROM data_sections s, data_categories c
WHERE s.id = c.section_id
AND s.deleted = 0
AND c.deleted = 0";
echo "<ul>\n";
$result = mysql_query($query);
while($list = mysql_fetch_array($result)){

    if($last!=$list['sect_name']) {
        if ($last != null) echo "</ul>";
        echo "<li>".$list['sect_name']."</li>\n";
        $last = $list['sect_name'];
        echo "<ul>";
    }
    echo "<li>".$list['cat_name']."</li>";
}
echo "</ul>\n";
echo "</ul>";
?>