Code Igniter PHP Error - Message: Use of undefined constant

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Im loading different contents in my main view with my menu, the code is working properly but is i have this error message.

A PHP Error was encountered
Severity: Notice
Message: Use of undefined constant users - assumed 'users'
Filename: views/welcome.php
Line Number: 53
A PHP Error was encountered
Severity: Notice
Message: Use of undefined constant stores - assumed 'stores'
Filename: views/welcome.php
Line Number: 56
A PHP Error was encountered
Severity: Notice
Message: Use of undefined constant notes - assumed 'notes'
Filename: views/welcome.php
Line Number: 59

This is my view

            <div id="nav">
            <div id="imagesBox">
                <a href="index.php?section=users"><img class="imagesLeft" src="images/usuario_on.png"></a>
                <a href="index.php?section=stores"><img class="imagesLeft" src="images/tienda_on.png"></a>
                <a href="index.php?section=notes"><img class="imagesLeft" src="images/aviso_on.png"></a>
        </div>
        <?php
        $section; $users=0;
        switch ($_GET['section']) {
        case users:
            $this->load->view('users'); 
            break;
        case stores:
            $this->load->view('stores'); 
            break;
        case notes:
            $this->load->view('notes'); 
            break;
    }

?>
    </div>

And this is my controller (im using tank_auth and is working properly)

class Welcome extends CI_Controller
{
    function __construct()
    {
        parent::__construct();

        $this->load->helper('url');
        $this->load->library('tank_auth');
    }
    function index()
    {
        if (!$this->tank_auth->is_logged_in()) {
            redirect('/auth/login/');
        } else {
            $data['user_id']    = $this->tank_auth->get_user_id();
            $data['username']   = $this->tank_auth->get_username();
            $this->load->view('welcome', $data);
        }
    }
}

I dont find the best method to fix this and this is a little weird, because the code is working like i want.

asked 16 secs ago

MidouCloud

33