在帖子中获取 WordPress 附件 PowerPoint URL

问：

我想在WordPress帖子中显示此框架中的PPT文件。

<iframe src="https://view.officeapps.live.com/op/embed.aspx?src=<?php echo $attachment_url ?>" width="100%" height="500px" frameborder="0"></iframe>

我把这个循环放在post.php中。但不起作用。

<?php
$args = array(
    'post_type' => 'attachment', // Retrieve attachments
    'post_mime_type' => 'application/vnd.ms-powerpoint', // Filter by MIME type for PPT files
    'posts_per_page' => -1, // Retrieve all attachments
);

$attachments = new WP_Query($args);

if ($attachments->have_posts()) :
    while ($attachments->have_posts()) : $attachments->the_post();
        $attachment_id = get_the_ID();
        $attachment_title = get_the_title();
        $attachment_url = wp_get_attachment_url($attachment_id);


    endwhile;
endif;

wp_reset_postdata(); // Restore the original post data
?>`

有人请帮助我们更正此代码。