Codeigniter echoing [::1] instead of localhost

More accurate and dynamic way

$root = "http://".$_SERVER['HTTP_HOST'];
$root .= dirname($_SERVER['SCRIPT_NAME']);
$config['base_url'] = $root;

Though you can still use port.

In order to use base_url(); you must first have the URL Helper loaded. This can be done either in application/config/autoload.php (on or around line 67): or you can manually using

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

than set the

$config['base_url'] = 'http://localhost/your_site_url';

i think it will help you

You need to edit your $config['base_url'] as follows,

$config['base_url'] = '';
$config['base_url'] = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on") ? "https" : "http");
$config['base_url'] .= "://" . $_SERVER['HTTP_HOST'];
$config['base_url'] .= str_replace(basename($_SERVER['SCRIPT_NAME']), "", $_SERVER['SCRIPT_NAME']);

File location: codeigniter/application/config/config.php
Use above code to get dynamic url.

It's because of your base_url is empty.

In config/config.php

$config['base_url'] = 'http://localhost/project_name';

Something more interesting about http://\[::1\]/