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Question

I have a session that I turn into a variable $userID.

I now need to use the variable within a different controller. I have tried to start a new session after the session $this->session->sess_destroy();.

Then on my second controller I have tried to get the session data but I am getting NULL.

First controller

public function index()
{

    if ($this->input->post('tid')) {

        $this->session->userdata('user_id');
        $userID = $this->session->userdata('user_id');
        $this->session->sess_destroy();

        $this->session->set_userdata($userID);

        $this->input->post('userid');
        $data['tid'] = $this->input->post('tid');
        $this->load->view('client/login', $data);


    } else {
        header("Location: " . base_url() . "index.php/select");
        die();
    }

}

Second controller

private function getResults()
{
    $this->session->userdata('user_id');

    $userID = $this->session->userdata('userid');

    var_dump($userID);
}

If I vardump the variable in my first controller after session destroy, the variable prints out. However it does not on the second.

Answer 1

I'm not sure this is your problem but I think there's a problem on this line:

$this->session->set_userdata($userID);

set_userdata accepts two kinds of arguments (link to docs) :

1. a single argument as an associative array of keys and values or
2. a "key" first argument and a "value" second argument

So what you're probably looking to do is rather

$this->session->set_userdata('user_id', $userId);

or

$data = ['user_id' => $userId];
$this->session->set_userdata($data);

As you prefer. Also, as a side note, this kind of code gets repeated a few times :

$this->session->userdata('user_id');
$userID = $this->session->userdata('user_id');

The first call is useless and should be removed.