Wordpress menu in Codeigniter controller -

i try call codeigniter controller outside of box wordpress blog menu, following error

fatal error: cannot redeclare site_url() (previously declared in /../system/helpers/url_helper.php:53)      public function getwordpressmenu() {         ini_set('display_startup_errors', 1);         ini_set('display_errors', 1);         error_reporting(-1);          // no theme output         define('wp_use_themes', false);         // initializes entire wordpress         require $_server['document_root'] . 'blog/wp-blog-header.php';         wp_nav_menu('your_theme_menu_location');       } 

i know both of frameworks have same function there way disable on of inside of controller?

in codeigniter can replace helpers creating new file @ application/helpers

in case, can create new file @ application/helpers name url_helper.php

just copy url_helper.php folder system/helpers , copy application/helpers/ . open file url_helper.php , rename function url_helper else, example: ci_site_url