add_user_to_blog()

add_user_to_blog()函数是Wordpress函数，将用户添加到博客。

add_user_to_blog( int $blog_id, int $user_id, string $role )

说明（Description）

当用户被添加到博客时，使用“将用户添加到博客”操作触发事件。

参数（Parameters）

返回（Return）

（true|WP_Error）成功时为true，如果用户不存在或无法添加，则为WP_Error对象。

源码（Source）

/**
 * Add a user to a blog.
 *
 * Use the 'add_user_to_blog' action to fire an event when
 * users are added to a blog.
 *
 * @since MU 1.0
 *
 * @param int    $blog_id ID of the blog you're adding the user to.
 * @param int    $user_id ID of the user you're adding.
 * @param string $role    The role you want the user to have
 * @return true|WP_Error
 */
function add_user_to_blog( $blog_id, $user_id, $role ) {
	switch_to_blog($blog_id);
	$user = get_userdata( $user_id );
	if ( ! $user ) {
		restore_current_blog();
		return new WP_Error( 'user_does_not_exist', __( 'The requested user does not exist.' ) );
	}
	if ( !get_user_meta($user_id, 'primary_blog', true) ) {
		update_user_meta($user_id, 'primary_blog', $blog_id);
		$details = get_blog_details($blog_id);
		update_user_meta($user_id, 'source_domain', $details->domain);
	}
	$user->set_role($role);
	/**
	 * Fires immediately after a user is added to a site.
	 *
	 * @since MU
	 *
	 * @param int    $user_id User ID.
	 * @param string $role    User role.
	 * @param int    $blog_id Blog ID.
	 */
	do_action( 'add_user_to_blog', $user_id, $role, $blog_id );
	wp_cache_delete( $user_id, 'users' );
	wp_cache_delete( $blog_id . '_user_count', 'blog-details' );
	restore_current_blog();
	return true;
}