title: How to Extend a Helper in CodeIgniter?
body: <p>I want to add some new functions to the core <code>string</code> helper, which is found in <code>system/helpers</code> folder. I think there was a 'right' way to do this using <code>MY_String_helper</code>, or something of that sort. I can't remember exactly how it was done though. Any thoughts on this issue?</p>