nonupgradesafe.php

<?php

// this file is non-upgrade safe
// location: custom/modules/Contacts/views/view.detail.php

require_once('include/MVC/View/views/view.detail.php');

class ContactsViewDetail extends ViewDetail {
    /**
     * @see SugarView::display()
     *
     * We are overriding the display method to manipulate the portal information.
     * If portal is not enabled then don't show the portal fields.
     */
    public function display()
    {
        $admin = new Administration();
        $admin->retrieveSettings();
        if (isset($admin->settings['portal_on']) && $admin->settings['portal_on']) {
            $this->ss->assign("PORTAL_ENABLED", true);
        }

        // my custom code here

        parent::display();
    }
}