Admin_Apple_Notice::add_user_meta PHP Метод

    private static function add_user_meta($user_id, $key, $value)
    {
        // We can't use add_user_meta because there is no equivalent on VIP.
        // Instead manage values within the same variable for consistency.
        $values = self::get_user_meta($user_id, $key);
        if (empty($values)) {
            $values = array();
        }
        // Add the new value
        $values[] = $value;
        // Save using the appropriate method
        if (defined('WPCOM_IS_VIP_ENV') && true === WPCOM_IS_VIP_ENV) {
            return update_user_attribute($user_id, $key, $values);
        } else {
            return update_user_meta($user_id, $key, $values);
        }
    }