图像url作为附件post\\u类型存储在wp\\u posts中，其相应的post作为父对象。来自Codex，请参阅Template Tags Show All Attachments

我相信这样的东西可以在循环外检索DB中的所有附件：

   global $post;
   $args = array( 
         \'post_type\' => \'attachment\', 
         \'posts_per_page\' => -1, 
         \'post_status\' => \'any\', 
         \'post_parent\' => null 
          ); 
   $attachments = get_posts( $args );
  if ( $attachments ) {
    foreach ( $attachments as $post ) {
        setup_postdata( $post );
        the_title();
        the_attachment_link( $post->ID, false );
        the_excerpt();
    }
    wp_reset_postdata();

也许像这样的东西可以找到并清除/uploads/directory中不再可用的内容：

$args = array(
      \'post_type\' => \'attachment\',
      \'numberposts\' => -1
      );
$attachments = get_posts( $args );
foreach( $attachments as $attch ){
    $file = get_attached_file( $attch->ID );
    if( !file_exists( $file ) ){
        wp_delete_post( $attch->ID, false );
    }
}

Reference for get_attached_file()

Reference for wp_delete_post()

仔细研究这些问题，就可以很容易地找到实现所需清理的方法。