Redirect to referer url in codeigniter
This can help:
CI 2+ https://www.codeigniter.com/userguide2/libraries/user_agent.html
CI 3+ http://www.codeigniter.com/userguide3/libraries/user_agent.html
Below solution is for Codeigniter version 3
$this->load->library('user_agent');
if ($this->agent->is_referral())
{
echo $this->agent->referrer();
}
UPDATE: interesting and useful information on how to obtain referrer information with the same user_agent library
https://www.tutorialandexample.com/user-agent-class/
How about just
redirect($_SERVER['HTTP_REFERER']);
Using php's $_SERVER
global variable.
This worked for me!