WordPress at a glance
function is not described

add_new_user_to_blog() WP 3.0.0

Adds a newly created user to the appropriate blog

To add a user in general, use add_user_to_blog(). This function is specifically hooked into the 'wpmu_activate_user' action.

  • See: add_user_to_blog()

No Hooks.

Return

Nothing (null).

Usage

add_new_user_to_blog( $user_id, $password, $meta );
$user_id(int) (required)
$password(mixed) (required)
Ignored.
$meta(array) (required)

Code of add new user to blog: wp-includes/ms-functions.php VER 5.0.3

<?php
function add_new_user_to_blog( $user_id, $password, $meta ) {
	if ( !empty( $meta[ 'add_to_blog' ] ) ) {
		$blog_id = $meta[ 'add_to_blog' ];
		$role = $meta[ 'new_role' ];
		remove_user_from_blog( $user_id, get_network()->site_id ); // remove user from main blog.

		$result = add_user_to_blog( $blog_id, $user_id, $role );

		if ( ! is_wp_error( $result ) ) {
			update_user_meta( $user_id, 'primary_blog', $blog_id );
		}
	}
}