accessing one object's attribute from another

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Hi all, I've be developing with a structured approach for a long time
and am working at improving my site by adding some classes etc.  I
however, am running into an odd thing that I can't figure out what a
reasonable search syntax would yield the desired solution.  The problem
is as follows:

class a {

	var $thisVar;
	...
}

class b {

	function hello()
	{
		echo $first->thisVar;
	}
}

$first = new a();
$first->thisVar = "world";

$second = new b();
$second->hello();


There are a number of variables and methods that are common throughout
the user's session that I'm storing in object $first.  Class b has
nothing in common with a except that it needs a couple of the variables
stored in the object that is hanging around in the session.

Is $first->thisVar the wrong way to reference that variable?  How can I
get to it?

TIA,

Larry

	

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