Load controller from another controller

Did you think of using a library for that? Or create a MY_Controller.php in the application/core folder. Write a method to generate a common set of views or even different sets of views.
Let all your controllers (which are classes) extend the MY_Controller's class. Like that, you can use "common" methods in all your controllers.

I've tried this method and yeas it works! But i see a lot of people suggest not to do such thing like extending controllers in core folder. That's why i thought to ask for an alternative (in case there is one)!

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//Life motto
if (sad() == true) {
     sad().stop();
     develop();
}