CodeIgniter中未更新会话值

Question

I'm wondering if did I just found a bug or the amount of hours programming might not let me see the obvious?

Here's an example of my code:

class home extends CI_Controller
{
    public function __construct()
    {

    }

    public function edit()
    {
        // Prints: John
        print_r($this->session->userdata('name'));

        $this->load->view('home/edit');
    }

    public function ajax_edit()
    {
        $this->session->userdata('name', 'Obama');

        // Prints: Obama
        print_r($this->session->userdata('name'));
    }
}

I call the function ajax_edit by ajax, and the print is "Obama", which is correct. After that, I refresh the page (to the edit function) and the output of the name is "John".

Why in god's heaven isn't the session updated with the value "Obama"? It seems that after refreshing it resets or something and backs to the old value "John".

Answer 1

The problem is that you are not using the right methods.

In order to set any new information to your CI session, you need to use set_userdata(), and in order to retrieve, or to check, whats in the session you use userdata("key").

Solution: Rewrite your ajax_edit() method code like so:

public function ajax_edit() {
    $this->session->set_userdata('name', 'Obama');

    // Prints: Obama
    print_r($this->session->userdata('name'));
}

Source: http://www.codeigniter.com/user_guide/libraries/sessions.html#adding-session-data