Is adding functions to CI_Controller bad practice?

[eluser]skunkbad[/eluser]
[quote author="coldscooter" date="1332968903"]I have a function that I wish to be available to all controllers.

Should I simply add this function to the CI_Controller class?[/quote]

No, you should extend the CI_Controller class with a MY_Controller class. Then all of your controllers will extend MY_Controller instead of CI_Controller.