wp_new_user_notification()

wp_new_user_notification() — Emails login credentials to a newly-registered user. A new user registration notification is also sent to admin email.

Inputs: $user_id (int): User ID. $deprecated (mixed): Not used. $notify (string): Optional. Type of notification that should happen. Accepts ‘admin’ or an empty string (admin only), ‘user’, or ‘both’ (admin and user). Default empty.