//Gravity Forms Username
    add_filter( 'gform_username', 'auto_username', 10, 4 );
    function auto_username( $username, $feed, $form, $entry ) {

        $username = strtolower( rgar( $entry, '2.3' ) . rgar( $entry, '2.6' ) );

        if ( empty( $username ) ) {
            return $username;
        }

        if ( ! function_exists( 'username_exists' ) ) {
            require_once( ABSPATH . WPINC . '/registration.php' );
        }

        if ( username_exists( $username ) ) {
            $i = 2;
            while ( username_exists( $username . $i ) ) {
                $i++;
            }
            $username = $username . $i;
        };

        return $username;
    }

// Redefine user notification function
    if ( !function_exists('wp_new_user_notification') ) {
        function wp_new_user_notification( $user_id, $plaintext_pass = '' ) {
            $user = new WP_User($user_id);

            $user_login = stripslashes($user->user_login);
            $user_email = stripslashes($user->user_email);
            $user_firstname = stripslashes($user->user_firstname);

            if ( empty($plaintext_pass) )
                return;

            //$message  = __('Hi there,') . "\r\n\r\n";
            $message .= sprintf(__("Beste %s,"), ucfirst($user_firstname)) . "\r\n\r\n";
            $message .= sprintf(__("Bedankt voor het aanmaken van een account op %s!"), get_option('blogname')) . "\r\n\r\n";
            $message .= sprintf(__('Je gebruikersnaam is: %s'), $user_email) . "\r\n";
            $message .= sprintf(__('Je wachtwoord is automatisch gegenereerd: %s'), $plaintext_pass) . "\r\n\r\n";
            $message .= sprintf(__('Je kunt je account hier raadplegen om je bestellingen te bekijken en je wachtwoord te wijzigen: https://www.30kiloafvallen.nl/my-account/.'), get_option('admin_email')) . "\r\n\r\n";
            $message .= __('Tot snel!');

            wp_mail($user_email, sprintf(__('[%s] Uw Gebruikersnaam en Wachtwoord'), get_option('blogname')), $message);

        }
    }

//Auto login after registration
    function auto_login_new_user( $user_id ) {
            wp_set_current_user($user_id);
            wp_set_auth_cookie($user_id);
                // You can change home_url() to the specific URL,such as
            //wp_redirect( 'http://www.wpcoke.com' );
            wp_redirect( 'https://www.30kiloafvallen.nl/product-categorie/afslanken/' );
            exit;
        }
        add_action( 'user_register', 'auto_login_new_user' );