References to functions inside a class?

Can anyone point me to documentation on (or the subject of a previous
discussion about) how to do something like this?

<?php

class Call
{
	function Call($limit)
	{
	  if($limit)
		$this->query() = &$this->query_l();
	  else
		$this->query() = &$this->query_u();
	}
}
?>

PS: I'll even accept a pointer to discussion saying that it CAN'T be
done...I know someone on this list was discussiing this at one pont, but I
don't recall the discussion.

Thanks.


	--Joey Smith

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