WP_Import::backfill_parents PHP Method

        function backfill_parents()
        {
            global $wpdb;
            // find parents for post orphans
            foreach ($this->post_orphans as $child_id => $parent_id) {
                $local_child_id = $local_parent_id = false;
                if (isset($this->processed_posts[$child_id])) {
                    $local_child_id = $this->processed_posts[$child_id];
                }
                if (isset($this->processed_posts[$parent_id])) {
                    $local_parent_id = $this->processed_posts[$parent_id];
                }
                if ($local_child_id && $local_parent_id) {
                    $wpdb->update($wpdb->posts, array('post_parent' => $local_parent_id), array('ID' => $local_child_id), '%d', '%d');
                }
            }
            // all other posts/terms are imported, retry menu items with missing associated object
            $missing_menu_items = $this->missing_menu_items;
            foreach ($missing_menu_items as $item) {
                $this->process_menu_item($item);
            }
            // find parents for menu item orphans
            foreach ($this->menu_item_orphans as $child_id => $parent_id) {
                $local_child_id = $local_parent_id = 0;
                if (isset($this->processed_menu_items[$child_id])) {
                    $local_child_id = $this->processed_menu_items[$child_id];
                }
                if (isset($this->processed_menu_items[$parent_id])) {
                    $local_parent_id = $this->processed_menu_items[$parent_id];
                }
                if ($local_child_id && $local_parent_id) {
                    update_post_meta($local_child_id, '_menu_item_menu_item_parent', (int) $local_parent_id);
                }
            }
        }

 public function wpImportContents($file)
 {
     $wp_import = new WP_Import();
     $wp_import->fetch_attachments = false;
     // doesn matter
     // load data from saved option
     $wp_import->post_orphans = get_option('_cri_post_orphans', array());
     $wp_import->processed_posts = get_option('_cri_processed_posts', array());
     $wp_import->url_remap = get_option('_cri_url_remap', array());
     // the odd filter
     add_filter('import_post_meta_key', array($wp_import, 'is_valid_meta_key'));
     add_filter('http_request_timeout', array(&$wp_import, 'bump_request_timeout'));
     // start buffer
     ob_start();
     // parse file and gather data
     $wp_import->import_start($file);
     // map author
     $wp_import->get_author_mapping();
     wp_suspend_cache_invalidation(true);
     $wp_import->process_categories();
     $wp_import->process_tags();
     $wp_import->process_terms();
     $wp_import->process_posts();
     wp_suspend_cache_invalidation(false);
     // update incorrect/missing information in the DB
     $wp_import->backfill_parents();
     $wp_import->backfill_attachment_urls();
     $wp_import->remap_featured_images();
     // end has output, so buffer it out
     $wp_import->import_end();
     // ignore the output, call in buffer
     do_action('radium_after_content_import');
     ob_end_clean();
     // delete all attachment related stats
     foreach (array('_cri_post_orphans', '_cri_processed_posts', '_cri_url_remap') as $op) {
         delete_option($op);
     }
     return true;
 }