WordPress at a glance
action is not described

register_new_user action-hook . WP 4.4.0

Fires after a new user registration has been recorded.

Usage

add_action( 'register_new_user', 'action_function_name_3367' );
function action_function_name_3367( $user_id ){
	// action...
}
$user_id(int)
ID of the newly registered user.

Changelog

Since 4.4.0 Introduced.

Where the hook is called

register_new_user()
register_new_user
wp-includes/user.php 2514
do_action( 'register_new_user', $user_id );

Where the hook is used (in WP core)

wp-includes/default-filters.php 443
add_action( 'register_new_user', 'wp_send_new_user_notifications' );