按用户头像上传或自动设置功能照片

我希望用户头像图像设置为特征图像，如果没有特征图像。

我正试着这样做。

function auto_featured_image() {
global $post;

if (!has_post_thumbnail($post->ID)) {
    $attached_image = get_children( "post_parent=$post->ID&post_type=attachment&post_mime_type=image&numberposts=1" );
    //$attached_avatar = get_avatar( get_the_author_meta( \'ID\' ));
    $attached_avatar = get_avatar(1);

  if ($attached_image) { // set feature image as the 1st image on post.
          foreach ($attached_image as $attachment_id => $attachment) {
               set_post_thumbnail($post->ID, $attachment_id);
          }
  }/*elseif($attached_avatar){ // set feature image as the avatar image.
            foreach ($attached_avatar as $attachment_id => $attachment) {
                set_post_thumbnail($post->ID, $attachment_id);
            }

  }*/
 }
}
 // Use it temporary to generate all featured images
add_action(\'the_post\', \'auto_featured_image\');
// Used for new posts
add_action(\'save_post\', \'auto_featured_image\');
add_action(\'draft_to_publish\', \'auto_featured_image\');
add_action(\'new_to_publish\', \'auto_featured_image\');
add_action(\'pending_to_publish\', \'auto_featured_image\');
add_action(\'future_to_publish\', \'auto_featured_image\');

将特征图像设置为post works fine上的第一个图像。但将头像设置为功能图像不起作用。

我怎样才能让它工作？谢谢

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我已经修改了循环。php文件中添加一些注释内容。我想展示一个链接上的评论，这个链接运行得很好。现在我把作者的头像放进去，让评论更详细。所以我的代码是这样的。它确实显示默认的头像，但应该显示我的图像，而不是它。 $comments = get_comments( array( \'post_id\' => $post->ID, \'number\' => \'1\' ) ); foreach ( $comments as $commen

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