How to create “remember me checkbox” using Codeigniter session library?

Question

in Codeigniter I am building an Authentication system for my web site and to achieve that I use session library

     session->set_userdata(\'username\')
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Answer 1

$this->session->sess_expiration = '14400';    // expires in 4 hours
$this->session->set_userdata($data);          // set session