我有一个功能，当需要满足客户需求时，我可以在许多自定义主题中重复使用。我知道现在可以通过ACF Pro中的中继器实现这一点，但由于我有一个工作功能，所以我选择使用它。

我现在面临的问题是，我真的很难在v5.4.2中的自定义帖子类型上显示这一点。我甚至安装了“classic Editor”插件，看看这是否是遗留元字段的问题，但没有乐趣。。。

带注释的函数代码为：

    //custom post type attachments for bikes.
add_filter( \'attachments_default_instance\', \'__return_false\' ); // disable the default instance

function post_attachments( $attachments )
{
  $fields         = array(
    array(
      \'name\'      => \'title\',                         // unique field name
      \'type\'      => \'text\',                          // registered field type
      \'label\'     => __( \'Title\', \'attachments\' ),    // label to display
      \'default\'   => \'title\',                         // default value upon selection
    ),
    array(
      \'name\'      => \'caption\',                       // unique field name
      \'type\'      => \'textarea\',                      // registered field type
      \'label\'     => __( \'Caption\', \'attachments\' ),  // label to display
      \'default\'   => \'caption\',                       // default value upon selection
    ),
  );

  $args = array(
    // title of the meta box (string)
    \'label\'         => \'Bike Images\',
    // all post types to utilize (string|array)
    \'post_type\'     => array( \'post\', \'page\', \'used\' ),
    // meta box position (string) (normal, side or advanced)
    \'position\'      => \'normal\',
    // meta box priority (string) (high, default, low, core)
    \'priority\'      => \'high\',
    // allowed file type(s) (array) (image|video|text|audio|application)
    \'filetype\'      => null,  // no filetype limit
    // include a note within the meta box (string)
    \'note\'          => \'Attach files here!\',
    // by default new Attachments will be appended to the list
    // but you can have then prepend if you set this to false
    \'append\'        => true,
    // text for \'Attach\' button in meta box (string)
    \'button_text\'   => __( \'Attach Files\', \'attachments\' ),
    // text for modal \'Attach\' button (string)
    \'modal_text\'    => __( \'Attach\', \'attachments\' ),
    // which tab should be the default in the modal (string) (browse|upload)
    \'router\'        => \'browse\',
    // whether Attachments should set \'Uploaded to\' (if not already set)
      \'post_parent\'   => false,
    // fields array
    \'fields\'        => $fields,
  );

  $attachments->register( \'post_attachments\', $args );
}
add_action( \'attachments_register\', \'post_attachments\' );

我一直坚持这样做，所以任何提示都将不胜感激。我还需要通过v2 API提供这些图像文件的URL。这一要求是否使使用诸如ACF Pro之类的plgin更加相关？

我担心在构建不打算转售的定制主题时使用过多的第三方插件。