Private WordPress community site - redirect guests to register page

private-community.php

<?php

/** 
 * Restrict users to your site and redirect them to register page 
 * @author SeventhQueen
 *
 * @return void
 */
function sq_restrict_my_website(){

global $pmpro_pages;
    if(!is_user_logged_in() && ( function_exists('bp_is_active') && ! bp_is_register_page() ) && $GLOBALS['pagenow'] !== 'wp-login.php' && ( !empty( $pmpro_pages ) && !is_page($pmpro_pages) )){
        wp_redirect(wp_registration_url());
        exit();
    }

}

add_action('template_redirect', 'sq_restrict_my_website');