如何从另一个控制器加载控制器的方法？

I have the following controller:

class Tests extends CI_Controller {

        public function update_record_test()
        {
              //some methods
        }
}

?>

But I need to execute Method1 method from Controller1 controller. How can I do it?

There's not much information here, or I may be missing something, but what's wrong with

class Tests extends CI_Controller {

    public function update_record_test()
    {
          $controller1 = new Controller1();
          $controller1->Method1();
    }
}

If you mean you want to execute a function of your main class CI_CONTROLLER, try this.

 parent::Method1();

Check the http://php.net/manual/en/keyword.extends.php for more examples