我创建了一些代码来返回附件类别，如下所示：

<?php
    // Attachment Categories
    $categories = get_the_category($attachment->ID);
    if ($categories) {
?>
    <ul>
        <?php foreach ($categories as $category) { ?>
            <?php if ($category->name !== \'Slides\') if ($category->name !== \'Uncategorized\') { ?>
                <li><?php echo $category->name; ?></li>
            <?php } ?>
        <?php } ?>
    </ul>
<?php } ?>

我正在尝试添加else, 但由于某种原因，else不适用于这两个if 语句。。。如果我删除一个if 声明else 作品

带有else 看起来像：

<ul>
    <?php foreach ($categories as $category) { ?>
        <?php if ($category->name !== \'Slides\') if ($category->name !== \'Uncategorized\') { ?>
            <li><?php echo $category->name; ?></li>
        <?php } else { ?>
            <li>Unknown</li>
        <?php } ?>
    <?php } ?>
</ul>

有人能给我指出正确的方向吗？

谢谢，乔希

<ul>
    <?php foreach ($categories as $category) { ?>
        <?php if ($category->name !== \'Slides\' && $category->name !== \'Uncategorized\') { ?>
            <li><?php echo $category->name; ?></li>
        <?php } else { ?>
            <li>Unknown</li>
        <?php } ?>
    <?php } ?>
</ul>

<ul>
    <?php foreach ($categories as $category) { ?>
        <?php if ($category->name !== \'Slides\' && $category->name !== \'Uncategorized\') { ?>
            <li><?php echo $category->name; ?></li>
        <?php } else { ?>
            <li>Unknown</li>
        <?php } ?>
    <?php } ?>
</ul>