mainplugin

<?php
    /*
    Plugin Name: Name
    Description: Description
    Author: Me
    Version: 1.0
    Author URI: http://www.google.com
    */
?>

<?php
    function afw_admin() {
        include('opties.php');
        }

    function afw_admin_actions() {
        add_menu_page("Afwezigheid Module", "Afwezigheid Module", 1, "Afwezigheid_Module", "afw_admin");
        }

    add_action('admin_menu', 'afw_admin_actions');
?>