下面的代码上载了一个我想与自定义帖子类型关联的图像。

$upload_overrides = array( \'test_form\' => FALSE );
if($file_errors[\'error\'] == 0) {

  if($new_reseller_id = wp_insert_post( $new_reseller_profile_data )){

    //$this->wps_process_image($file, $new_reseller_id);exit;

    $uploaded_file = wp_handle_upload( $file, $upload_overrides );

    $wp_filetype = wp_check_filetype(basename($uploaded_file[\'file\']), null );
    $wp_upload_dir = wp_upload_dir();
    $attachment = array(
      \'guid\' => $wp_upload_dir[\'url\'] . \'/\' . basename( $uploaded_file[\'file\'] ),
      \'post_mime_type\' => $wp_filetype[\'type\'],
      \'post_title\' => preg_replace(\'/\\.[^.]+$/\', \'\', basename($file[\'name\'])),
      \'post_content\' => \'\',
      \'post_status\' => \'inherit\'
    );
    $attach_id = wp_insert_attachment( $attachment, $uploaded_file[\'file\'], $new_reseller_id );
    // you must first include the image.php file
    // for the function wp_generate_attachment_metadata() to work
    $attach_data = wp_generate_attachment_metadata( $attach_id, $uploaded_file[\'file\'] );
    wp_update_attachment_metadata( $attach_id, $attach_data );

  }
}

图像已上载并可在图像库中查看，但不会在自定义帖子类型编辑器中显示为特征图像。为什么会这样？

set_post_thumbnail( $new_reseller_id, $attach_id );

// Set Featured Image
update_post_meta($new_reseller_id, \'_thumbnail_id\', $attach_id);