使用get_comment 返回有关注释的信息，如comment_author_email.

然后，您可以尝试通过电子邮件获取用户，使用get_user_by(\'email\', $comment_author_email).

一旦你有了WP_User 您应该能够访问ID 该用户的。

所有这些都假设，评论作者的电子邮件被用作用户的注册电子邮件

您应该使用它：<?php get_comment( $id, $output ); ?>

返回

comment_ID 
(integer) The comment ID
comment_post_ID 
(integer) The post ID of the associated post
comment_author 
(string) The comment author\'s name
comment_author_email 
(string) The comment author\'s email
comment_author_url 
(string) The comment author\'s webpage
comment_author_IP 
(string) The comment author\'s IP
comment_date 
(string) The datetime of the comment (YYYY-MM-DD HH:MM:SS)
comment_date_gmt 
(string) The GMT datetime of the comment (YYYY-MM-DD HH:MM:SS)
comment_content 
(string) The comment\'s contents
comment_karma 
(integer) The comment\'s karma
comment_approved 
(string) The comment approbation (0, 1 or \'spam\')
comment_agent 
(string) The comment\'s agent (browser, Operating System, etc.)
comment_type 
(string) The comment\'s type if meaningfull (pingback|trackback), and empty for normal comments
comment_parent 
(string) The parent comment\'s ID
user_id 
(integer) The comment author\'s ID if he is registered (0 otherwise)

$comment_id = $commentID; //$commentID your var

$comment = get_comment( $comment_id );

$comment_author_id = $comment -> user_id;