public function __construct()
 {
     // Load options
     $this->options = WP_Block_Admin_Login_Core::instance()->options;
     // Initialize theme options when in WP admin
     add_action('admin_menu', array($this, 'add_settings_page'));
     // Initialize general theme settings
     add_action('admin_init', array($this, 'init_settings'));
 }
<?php

/*
Plugin Name: WP Block Admin Login
Plugin URI: http://www.uprise.nl
Description: Blocks "admin" user by default form loggin in. Really helpful against spammers!
Version: 1.0
Author: Uprise
Author URI: http://www.uprise.nl
*/
// Include classes
require_once 'classes/class-core.php';
require_once 'classes/class-forms.php';
require_once 'classes/class-settings.php';
// Load classes
$wpba_core = WP_Block_Admin_Login_Core::instance();
$wpba_settings = WP_Block_Admin_Login_Settings::instance();