wp_send_new_user_notifications()

wp_send_new_user_notifications() — Initiates email notifications related to the creation of new users. Notifications are sent both to the site admin and to the newly created user.

Inputs: $user_id (int): ID of the newly created user. $notify (string): Optional. Type of notification that should happen. Accepts ‘admin’ or an empty string (admin only), ‘user’, or ‘both’ (admin and user). Default ‘both’.