WordPress插件/主题开发中，如何获取文章发表用户的ID ？

LOOP循环中

官方文档：

get_the_author_meta( string $field = '', int|false $user_id = false )

Retrieves the requested data of the author of the current post.

Description 

Valid values for the $field parameter include:

• admin_color
• aim
• comment_shortcuts
• description
• display_name
• first_name
• ID
• jabber
• last_name
• nickname
• plugins_last_view
• plugins_per_page
• rich_editing
• syntax_highlighting
• user_activation_key
• user_description
• user_email
• user_firstname
• user_lastname
• user_level
• user_login
• user_nicename
• user_pass
• user_registered
• user_status
• user_url
• yim

Parameters

$field

(string) (Optional) The user field to retrieve.

Default value: ”$user_id

(int|false) (Optional) User ID.

Default value: false

Return

(string) The author’s field from the current author’s DB object, otherwise an empty string.

在循环外面通过以下方法获取用户ID

$author_id = get_post_field ('post_author', get_the_ID() );