It would be nice if a derived class could, within an overridden method, call the method of the same name in the parent class. For example ...

class DbTblC
	{
	var $id;
	var $othervar;

	function DbTblC()
		{
		$this->RReset();
		} // function DbTblC()

	function RReset()
		{
		$this->id=0;
		$othervar = "";
		} function RReset()
	} // class DbTblC

class AuthTblC extends DbTblC
	{
	function RReset()
		{
		$parent->RReset();
		$this->id = md5(uniqueid(random()));
		} // function RReset()
	} // class AuthTblC

What I have done as a work around is rename the RReset() function to RResetFields() and then stubbed the RReset() function to do nothing more than call RResetFields()...
class DbTblC
	{
...
	RResetFields()
		{
		$this->id=0;
		Rthis->othervar="";
		}

	RReset()
		{
		$this->ResetFields();
		}
	}

 Then the derived class can override RReset() with...
	function RReset()
		{
		$this->RResetFields();
		$this->id=md5(uniqueid(random)));
		}

This might work, but it rather loses some of the poetry of object oriented programming.