未经测试，但从理论上讲应该可行：

add_filter(\'get_attached_file\', function($path, $file, $attachment_id){

  // get the post object of the current attachment
  $att = get_post($attachment_id);

  // prepend attachment post parent ID to the file name
  return substr_replace($path, "{$att->post_parent}/{$file}", -strlen($file));
});

另一个过滤器尝试“修复”WP的上载处理程序返回的路径：

add_filter(\'wp_handle_upload\', function($results){
  global $post;

  if(empty($post))
    return $results;

  extract($results);

  $uploads = wp_upload_dir();

  $file = str_replace($uploads[\'basedir\'], "{$uploads[\'basedir\']}/{$post->ID}", $file);
  $url = str_replace($uploads[\'baseurl\'], "{$uploads[\'baseurl\']}/{$post->ID}", $url);

  return compact(\'file\', \'url\', \'type\');
});

如果媒体上载程序不在全局$post变量中公开当前帖子，则此操作将不起作用。