WordPress theme function.php

<?php

/* Security */

    defined( 'ABSPATH' ) or die('Not so fast! Go back to where you came from, it\'s only downhill from here.');

    //this might be redundant
    if ( !function_exists( 'add_action' )){
        echo "No Go";
        exit;
    }
/* End: Security */



final class Init {

    private static function get_services()
    {
        return [
            cleanWP::class,
            adminPanel::class
        ];
    }

    public static function register_services()
    {

        require_once( get_stylesheet_directory() . '/inc/whiteLabel.php');
        require_once(get_stylesheet_directory() . '/inc/adminPanel.php');


        foreach ( self::get_services() as $class ) {
            $service = self::instantiate( $class );
            if ( method_exists( $service, 'register' ) ) {
                $service->register();
            }
        }
    }

    private static function instantiate( $class )
    {
        $service = new $class();

        return $service;
    }

}



if ( function_exists('add_action') && class_exists('Init')){
    global $wp_admin_bar;
    Init::register_services();

}