我是 PHP 和 mySQL 的初学者。我正在通过我的数据库创建导航。我设置了两张表,一张是主要导航项,一张是子导航项。它们由subject_id
. 我正在使用循环来显示它们。第一个表显示,第二个表为信息应该在的位置留出空间,但它没有显示。我认为它一定是 SQL 设置中的东西,但我不知道。这是我的代码(我知道数据库已连接):
<?php require_once("includes/connection.php") ?>
<?php require_once("includes/functions.php") ?>
<?php include("includes/headder.php") ?>
<table id="structure">
<tr>
<td id="navigation">
<ul class="subjects">
<?php
$subject_set = mysql_query("SELECT * FROM subjects", $connection);
if(!$subject_set){
die("database query failed: " . mysql_error());
}
while ($subject = mysql_fetch_array($subject_set)) {
echo "<li>" . $subject["menu_name"] . "</li>";
$page_set = mysql_query("SELECT * FROM pages WHERE subject_id = {$subject["id"]}", $connection);
if(!$page_set){
die("database query failed: " . mysql_error());
}
echo "<ul class=\"pages\">";
while ($page = mysql_fetch_array($page_set)) {
echo "<li>" . $page["menu_name"] . "</li>";
}
echo "</ul>";
}
?>
</ul>
</td>
<td id="page">
<h2>Content Area</h2>
</td>
</tr>
</table>
<?php include("includes/footer.php") ?>