Codeigniter 2.2 failed create session - php

Question

I use CI 2.2 to build a simple login system. But I get problem when I try to generate session. Of course I have properly set up libraries (database, session) and User_M. When I retrieve data from database (without session), that's work fine. This is my Controller code:
public function verify()
{
// Define variable
$user = $this->input->post('username');
$pass = $this->input->post('password');
// Check input data
if (!empty($user) AND !empty($pass))
{
// Check match data from db
$checks = $this->User_M->check_user($user, $pass);
if($checks->num_rows() == 1)
{
foreach ($checks->result() as $check)
{
$sess = array (
'username' => $check->username,
'logged_in' => TRUE
);
$rest = $this->session->set_userdata($sess);
if ($rest)
{
echo "working";
} else {
echo "not working";
}
}
} else {
echo "Not found";
}
} else {
echo "You've empty field";
}
}
Additional explain, I check the result with if ($rest)...bla..bla..bla, that's echoing Not Working. Please let me know where's my mistakes?
Thank in advance

Answer 1

I think the problem is with this statement
$rest = $this->session->set_userdata($sess);
the set_userdata() does not return anything, so according to your condition it will always execute the else part.
Try to change your condition like this
if (!empty($this->session->userdata("username"))){
echo "Working";
}else{
echo "Not Working";
}