Calling helpers/classes inside another helper

[eluser]ejangi[/eluser]
@simonspoken - Just to clarify the reason why $this throws an error inside a helper.

Helper functions are in the global namespace (not inside a class or anything like that) and therefore don't belong to an object. The $this variable is a reserved keyword (built into PHP itself) for accessing the containing object. So, because a helper function isn't inside a class/object PHP has not defined the $this variable and hence the error.

I hope that makes sense.