php - Why is constructor not sending array to view?

Solution:

But the$data array that is sent to the view does not containmy_test_variable too. In theindex() function, you're not setting that value when sending it to the view.

In__construct(),$data is a local variable visible only within the__construct() function. If you want to access it outside the function, maybe in theindex() function, one option would be to make it an instance property.

For example, instead of$data['my_test_variable'], you could use$this->data['my_test_variable'], then, inindex(), again, instead of$data, you could use$this->data.

Solution:

Pass your data with view

       function __construct()
      {
           parent::__construct();
            if (!$this->session->userdata('logged_in_admin') )
            {
              redirect('admin/login');
            }
           $this->load->model('mdl_admin');

         }

       public function index()
         {
             $data['header'] = "Home";
             $data['my_test_variable'] = "This is test!";
             $this->load->view('admin_frontpage', $data);
         }
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try this....

Solution:

First of all, you're implicitly creating variables in PHP - which is bad practice. You shouldn't be setting array keys in variables that don't exist. With the proper error reporting settings enabled, this would be causing you problems.

So, first, let's fix that problem:

function __construct() {
    parent::__construct();

    if (!$this->session->userdata('logged_in_admin')) {
        redirect('admin/login');
    }

    $this->load->model('mdl_admin');

    $data = array();
    $data['my_test_variable'] = "This is test!";
}

public function index() {
    $data = array();
    $data['header'] = "Home";
    $this->load->view('admin_frontpage', $data);
}
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And, in doing that, I think you should be able to see your problem now. The__construct() andindex() methods execute with a different stack. What that means is that the variables you declare inside of one are not available to the other. What you have to do in order to make this work is utilize an instance variable of the class you are creating, like this:

class MyView {
    protected $data = array();

    function __construct() {
        parent::__construct();

        if (!$this->session->userdata('logged_in_admin')) {
            redirect('admin/login');
        }

        $this->load->model('mdl_admin');
        $this->data['my_test_variable'] = "This is test!";
    }

    public function index() {
        $this->data['header'] = "Home";
        $this->load->view('admin_frontpage', $this->data);
    }
}
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And now you should get what you're after