* Filter the new user notification message.
     *
     * @param string $message The notification message.
     *
     * @return string
     */
    public function modify_notification_message($message)
    {
        if (!empty($this->notification_message)) {
            $message = $this->notification_message . "\r\n\r\n" . $message;
        }
        return $message;
    }
}
if (!function_exists('wp_new_user_notification')) {
    Simple_User_Adding_Plugin::$can_modify_email = true;
    if (version_compare($wp_version, '4.3', '<')) {
        /**
         * Email login credentials to a newly-registered user.
         *
         * A new user registration notification is also sent to admin email.
         *
         * @since 2.0.0
         *
         * @param int    $user_id        User ID.
         * @param string $plaintext_pass Optional. The user's plaintext password. Default empty.
         */
        function wp_new_user_notification($user_id, $plaintext_pass = '')
        {
            $user = get_userdata($user_id);
            // The blogname option is escaped with esc_html on the way into the database in sanitize_option