几天前我也做了同样的事。为了搜索引擎优化的目的，我把帖子slug作为图像名称。我创建了一个函数，根据slug和输入图像url创建/移动图像到特定文件夹。

这是我的函数的外观-

function tb_get_image($image_ext_url,$slug,$upload_folder="",$title=\'\'){
  $uri =  WP_CONTENT_DIR."/uploads/".$upload_folder;
  $folder =  WP_CONTENT_URL."/uploads/".$upload_folder;  

  if(!file_exists($uri)){
     $oldmask = umask(0);
     if(!mkdir ($uri, 0755)){
        $uri =  WP_CONTENT_DIR."/uploads/";
        $folder =  WP_CONTENT_URL."/uploads/";   
      }
  }


  $localimage = $uri.$slug.".jpg"; ## Use PHP_PATHINFO to get extension.
  $image = $folder.$slug.".jpg"; ## Use PHP_PATHINFO to get extension.

....

More code to rename and move/copy the image...
....
}