sitemap生成优化，减少内存使用

application/controllers/sitemap.php

@@ -33,6 +33,8 @@ class Sitemap extends CI_Controller {
 
     public function create($site_url, $site_sitemap = false) {
         @set_time_limit(0);
+		ini_set('max_execution_time', '0');
+		ini_set ('memory_limit', '512M');
         $data = array();
         $sitemap_string = '<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"> ';
         $data['lastEditList'] = $this->Information_model->get_last_edit_list(false);

application/models/information_model.php

@@ -108,7 +108,7 @@ class Information_model extends CI_Model {
         }
         $this->is_parent_id = " AND is1.is_parent_id = '$is_parent_id' ";
         $this->orderBy = ' ORDER BY is1.is_level ASC, is1.is_sort ASC,is1.is_path ASC ';
-        return $this->GetList();
+        return $this->GetList('is1.is_id,  ic.ic_id, ic.ic_url, ic.ic_url_title, ic.ic_title, ic.ic_datetime, ic.ic_author');
     }