how to use base url in custom config codeigniter code example

Example 1: codeigniter base_url

$this->load->helper('url');

Example 2: fix working base_url for local and server both in codeigniter

$config['base_url'] = "http://".$_SERVER['SERVER_NAME']."/project_name/";
this way you config you base_url , then won't worry about in hosting. both works in localhost and server.