tml_send_new_user_notifications()

function tml_send_new_user_notifications( $user_id, $notify = 'both' ) {

    /**
     * Filters whether to send the new user notification or not.
     *
     * @since 7.0.7
     *
     * @param bool $send_user_notification Whether to send the new user notification or not.
     */
    $send_user_notification = (bool) apply_filters( 'tml_send_new_user_notification', true );

    /**
     * Filters whether to send the new user admin notification or not.
     *
     * @since 7.0.7
     *
     * @param bool $send_admin_notification Whether to send the new user admin notification or not.
     */
    $send_admin_notification = (bool) apply_filters( 'tml_send_new_user_admin_notification', true );

    // Bail if both are disabled
    if ( ! ( $send_user_notification || $send_admin_notification ) ) {
        return;
    }

    // Set to both if empty
    if ( empty( $notify ) ) {
        $notify = 'admin';

        // Set to admin if set to both and user is disabled
    } elseif ( 'both' === $notify ) {
        if ( ! $send_user_notification ) {
            $notify = 'admin';
        } elseif ( ! $send_admin_notification ) {
            $notify = 'user';
        }
    }

    // Bail if type is admin and it is disabled
    if ( 'admin' === $notify && ! $send_admin_notification ) {
        return;

        // Bail if type is user and it is disabled
    } elseif ( 'user' === $notify && ! $send_user_notification ) {
        return;
    }

    wp_new_user_notification( $user_id, null, $notify );
}

View src/includes/functions.php, line 940 on GitHub