这是您从函数中得到的结果：

Array
(
    [path] => C:\\development\\xampp\\htdocs\\example.com/content/uploads/2012/04
    [url] => http://example.com/content/uploads/2012/04
    [subdir] => /2012/04
    [basedir] => C:\\~\\example.com/content/uploads
    [baseurl] => http://example.com/content/uploads
    [error] => 
)

因此，您可以使用

echo wp_basename( $uploads[\'baseurl\'] );

如果您正在运行多站点并定义了常量UPLOADS, 然后从UPLOADS 或BLOGUPLOADDIR.

EDIT

对于多站点，您会得到如下结果：

Array
(
    [path] => /var/www/example.com/public_html/wp-content/uploads/sites/2/2016/12,
    [url] => http://example.com/wp-content/uploads/sites/2/2016/12,
    [subdir] => /2016/12,
    [basedir] => /var/www/example.com/public_html/wp-content/uploads/sites/2,
    [baseurl] => http://example.com/wp-content/uploads/sites/2,
    [error] => ,
)

“2”之后的位置sites 是博客的ID