gistfile1.php

<?php
    public static function primary_nav() {
        // The site-wide navigation
        // wp_list_pages(array('depth' => '1', 'title_li' => false));
        $p = get_pages(array('parent' => 0, 'sort_column' => 'menu_order', 'hierarchical' => 0));
        $pages = array();
        
        global $wp_query;
        if (is_page() || is_attachment() || $wp_query->is_posts_page)
            $current_page = $wp_query->get_queried_object_id();
        
        foreach ($p as $key => $page) {
            $css_class = array('page', 'page_item', 'page-item-'.$page->ID);
            
            // Handle the first link in the list
            if ($key == 0)
                $css_class[] = 'first';
            
            // Handle the last link in the list
            if ($key == (count($p) - 1))
                $css_class[] = 'last';
            
            // If we're on the current page, simply make it active
            if ($page->ID == $current_page)
                $css_class[] = 'active';
            
            // If we're on a sub page, make the parent page active.
            if (!empty($current_page)) {
                $_current_page = get_page($current_page);
                if (isset($_current_page->ancestors) && in_array($page->ID, (array) $_current_page->ancestors))
                    $css_class[] = 'active';
                elseif ($_current_page && $page->ID == $_current_page->post_parent)
                    $css_class[] = 'active';
            } elseif ($page->ID == get_option('page_for_posts')) {
                $css_class[] = 'active';
            }
            
            $pages[$key] = '<li class="'.implode(' ', $css_class).'"><a href="'.get_page_link($page->ID).'"><span>'.$page->post_title.'</span></a></li>';
        }
        
        return implode("\n", $pages);
        
    }

?>