How to get previous page URL in codeigniter 3?

In this tutorial, We will learn how to redirect the previous page url in Codeigniter PHP. we may sometimes require to redirect the previous page after login.

Example 1:

<?php

$this->load->library('user_agent');
if ($this->agent->is_referral()){
    print_r($this->agent->referrer());
}

Example 2:

<?php

print_r($_SERVER['HTTP_REFERER']);

It will return the previous page  url.

Thanks, I hope it will work for you .......