Variables in class problem

[eluser]Michal1[/eluser]
Hey guys I would like to ask about an usage of variables in class.

Lets say I have a class "site". in this class I have two functions, first is index and second is "test".

in index function I have then this

Code:

function index()

{

$example = 'blablabla';

}

and now I want to use this same variable in function and use for example echo on this. So I have:

Code:

function test()

{

echo $example;

}

But when I do this I receive an error: Undefined variable: example

So my question is what do I need to do to have a variable which can I use through the whole class?

Thank you