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dave friend · 10-18-2018, 06:45 AM

Any public property in the controller is easily accessed just about anywhere. Take the property "$data" in the following example.

PHP Code:
Class Welcome extends CI_Controller
{
    public $data;

   //all the rest
} 

You can get the value of $data everywhere in the controller using $this->data.
It's also available anywhere you can get a reference to the controller. In models, you can still use $this. Here's a proof of concept. (It's dumb, I know. But it demos the point.)

PHP Code:
Class Welcome extends CI_Controller
{
    public $data;

    public function sayhi($name = "World")
    {
        $this->data = $name;
        $this->load->model('test_model');
        $data['name'] = $this->test_model->get_name();
        $this->load->view('test_view', $data);
    }
} 

Model

PHP Code:
class Test_model extends CI_Model
{
    public function get_name()
    {
        return $this->data;
    }
} 

The view

PHP Code:
<!DOCTYPE html>
<html>
    <head>
        <title>Testing 1 2 3</title>
    </head>
    <body>
        <?= "Hello $name"; ?>
    </body>
</html> 

Send a browser to example.com/welcome/sayhi/Dave and the screen displays "Hello Dave"

If you want to get at the controller from a custom library you have to do the same thing that the core libraries do - use get_instance(); You've probably already read about that here.