我会先拿到attachment ID 以及您可以使用的附件IDwp_delete_attachment($att_id)

you can try this

$all_posts = get_posts(array(
    \'numberposts\' => - 1,
    \'post_status\' => \'any\',
    \'post_type\' => get_post_types(\'\', \'names\') ,
));

foreach($all_posts as $all_post) {
    delete_post_media($all_post->ID);
}

function delete_post_media($post_id)
{
    if (!isset($post_id)) return;
    elseif ($post_id == 0) return;
    elseif (is_array($post_id)) return;
    else {
            $attachments = get_posts(array(
                    \'post_type\' => \'attachment\',
                    \'posts_per_page\' => - 1,
                    \'post_status\' => \'any\',
                    \'post_parent\' => $post_id
            ));
            foreach($attachments as $attachment) {
                    if (false === wp_delete_attachment($attachment->ID)) {

                            // Log failure to delete attachment.

                    }
            }
    }
}