OOP::problem?

Hi all, this is my first mail to this list, but I don't know if this is the right one for my problem, because it is not really depending on pear, but I hope there are some php devs, who can help me? Ok, I have a little idea to use it in PEAR... I promise I'll tell it in my next posting ;-) Take a look at my example: <?php class a {

    function test($s)
    {
        $this->myvar = $s;
    }

} class b {

    var $myvar;

    function b($s)
    {
        a::test($s);

        echo $this->myvar;
    }

} $b =& new b("hello world!"); ?> The output is... "hello world!" Now my "problem": Is this a bug or a feature, that I can access to class variables of any object by using $this->anyvar in a class::function() ? Thanks, Matthias