I have a controller that have about 5-6 functions.
class Register extends CI_Controller {
public function index()
{
  //  some code written
}    
public function Add()
{
  //  Some code written
}
public function xyz()
{
  //  Some code written
  $this->abc();
}
public function abc()
{
  // Some code written
}
}
In xyz function, i want to call abc function.
Is this possible ? if so, how to call it ?