Use of Closures in Views

Actually, I did know about this, I use it when I want to pass variables to views but the values haven't yet been defined, or can get changed once the page is already loaded (EG: ajax related)

PHP Code:

<?php
public function set_common_view_vars($var)
{
    $partition = self::$CI->Partition_model->get_current_partition();

    $vars = array(
        'page_title'            => App_model::setting('application_name') . (
            ! is_null(self::$CI->template_lib->get_page_title())
                ? ' | ' . self::$CI->template_lib->get_page_title()
                : ''),
        'username'              => self::$CI->Accounts_model->username,
        'full_name'             => (count($name) > 0 ? ucwords(implode(' ', $name)) : "Authenticated User"),
        'page_header'           => $var,
        'can_change_password'   => self::$CI->account_lib->can_change_password(),
        'application_name'      => App_model::setting('application_name'),
        'current_partition_id'  => ($partition ? $partition->partition_id : NULL),
        'current_partition'     => ($partition ? $partition : NULL),
        // Anonymous Function
        'partition_list'        => function() {
            return self::$CI->Partition_model->get_partitions();
        },
        // Anonymous Function
        'notifications'         => function() {
            return App_lib::generate_notifications();
        },
        // Anonymous Function
        'sidebar'               => function() {
            return self::$CI->template_lib->generate_sidebar();
        },
        // Anonymous Function
        'breadcrumbs'           => function() {
            return self::$CI->template_lib->generate_breadcrumb();
        },
        // Closure
        'partition_pages'       => function() use($partition) {
            if( ! $partition )
                return FALSE;

            $pages = self::$CI->Page_model->get_pages_in_groups($partition->partition_id);

            //die('Pages 1: <pre>'. print_r($pages, TRUE));

            if(isset($pages['_']))
            {
                $top = $pages['_'];
                unset($pages['_']);
                //sort($pages);
                $pages = array_merge(['_' => $top],$pages);
            }

            return $pages;
        },
        // Anonymous Function
        'bookmarks'             => function() {
            return self::$CI->Accounts_model->get_my_bookmarks();
        }
    );

    self::$CI->load->vars($vars);
}