2020-05-02 / 5141阅 / 悠然
Retrieve the Post Global Unique Identifier (guid).
The guid will appear to be a link, but should not be used as an link to the post. The reason you should not use it as a link, is because of moving the blog across domains.
(int|WP_Post)
(Optional)
Post ID or post object. Default is global $post.
(string)