remove_user_from_blog()

从博客中删除用户。

remove_user_from_blog(int $user_id,int $blog_id,int $reassign)

说明（Description）

当用户从博客中删除时，使用“从博客中删除用户”操作触发事件。

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参数（Parameters）

参数	类型	必填	说明
$user_id	（int）	必需	要删除的用户的ID。
$blog_id	（int）	可选	正在从中删除用户的博客的ID。默认值0。
$reassign	（int）	可选	要向其重新分配职位的用户的ID。默认值0。

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返回（Return）

（true|WP_Error）成功时为true，如果用户不存在，则为WP_Error对象。

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源码（Source）

/**
 * Remove a user from a blog.
 *
 * Use the 'remove_user_from_blog' action to fire an event when
 * users are removed from a blog.
 *
 * Accepts an optional $reassign parameter, if you want to
 * reassign the user's blog posts to another user upon removal.
 *
 * @since MU 1.0
 *
 * @global wpdb $wpdb
 *
 * @param int    $user_id  ID of the user you're removing.
 * @param int    $blog_id  ID of the blog you're removing the user from.
 * @param string $reassign Optional. A user to whom to reassign posts.
 * @return true|WP_Error
 */
function remove_user_from_blog($user_id, $blog_id = '', $reassign = '') {
	global $wpdb;
	switch_to_blog($blog_id);
	$user_id = (int) $user_id;
	/**
	 * Fires before a user is removed from a site.
	 *
	 * @since MU
	 *
	 * @param int $user_id User ID.
	 * @param int $blog_id Blog ID.
	 */
	do_action( 'remove_user_from_blog', $user_id, $blog_id );
	// If being removed from the primary blog, set a new primary if the user is assigned
	// to multiple blogs.
	$primary_blog = get_user_meta($user_id, 'primary_blog', true);
	if ( $primary_blog == $blog_id ) {
		$new_id = '';
		$new_domain = '';
		$blogs = get_blogs_of_user($user_id);
		foreach ( (array) $blogs as $blog ) {
			if ( $blog->userblog_id == $blog_id )
				continue;
			$new_id = $blog->userblog_id;
			$new_domain = $blog->domain;
			break;
		}
		update_user_meta($user_id, 'primary_blog', $new_id);
		update_user_meta($user_id, 'source_domain', $new_domain);
	}
	// wp_revoke_user($user_id);
	$user = get_userdata( $user_id );
	if ( ! $user ) {
		restore_current_blog();
		return new WP_Error('user_does_not_exist', __('That user does not exist.'));
	}
	$user->remove_all_caps();
	$blogs = get_blogs_of_user($user_id);
	if ( count($blogs) == 0 ) {
		update_user_meta($user_id, 'primary_blog', '');
		update_user_meta($user_id, 'source_domain', '');
	}
	if ( $reassign != '' ) {
		$reassign = (int) $reassign;
		$post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $user_id ) );
		$link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $user_id ) );
		if ( ! empty( $post_ids ) ) {
			$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_author = %d WHERE post_author = %d", $reassign, $user_id ) );
			array_walk( $post_ids, 'clean_post_cache' );
		}
		if ( ! empty( $link_ids ) ) {
			$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->links SET link_owner = %d WHERE link_owner = %d", $reassign, $user_id ) );
			array_walk( $link_ids, 'clean_bookmark_cache' );
		}
	}
	restore_current_blog();
	return true;
}

更新版本	源码位置	使用	被使用
MU (3.0.0)	wp-includes/ms-functions.php:242	5	13