我不是百分之百确定我理解你想要什么，但是。。。

WordPress将连接的媒体视为自定义帖子类型。文件名（不含扩展名）存储为post_title 在$wpdb->posts 桌子因此，要获得路径，只需搜索文件名减去扩展名。

$q = new WP_Query(
  array(
    \'fields\' => \'ids\',
    \'name\'=>\'1011722_472449312832633_575764530_n\',
    \'post_type\' =>\'attachment\',
    \'post_status\' => \'inherit\',
    \'ignore_sticky_posts\' => true,
    \'posts_per_page\' => 1
  )
);
$attid = $q->posts[0];

也许这对你有帮助。我没有写详细的内容，因为我不确定这是否是真正的问题。

if ( ! function_exists( \'wp_handle_upload\' ) ) {
    require_once( ABSPATH . \'wp-admin/includes/file.php\' );
}
//selected file to upload
$uploadedfile = $_FILES[\'attachdoc\'];

//wp_handle_upload to upload the file. Check documentation.
$upload_overrides = array( \'test_form\' => false );
$movefile = wp_handle_upload( $uploadedfile, $upload_overrides );

if ( $movefile && !isset( $movefile[\'error\'] ) ) {
   //uploaded file url
   $attachments = $movefile[\'url\'];
   //uploaded file path
   $attachments = $movefile[\'file\'];
}