Syntax help. For php masters

[maxxx]

I'm trying to define a class say TPerson with a property that is a say
TCar, where class TCar has a property (owner) that is a TPerson; the
code should look like this:

persons.php:

<? php

require_once "cars";
cclass TPerson
{
var $name;
var $car;

function TPerson ($aName="")
{
$this->name = $aName;
$this->car = new TCar ();
}
?>

cars.php:

<? php

require_once "persons.php";
class TCar
{
var $model;
var $owner;

function TCar ($aModel="")
{
$this->model = $aModel;
$this->owner = new TPerson ();
}
?>

Though I use require_once in both files, I get a fatal error:
"Cannot redeclare TCar in cars.php line xxx".

Do I need something like forward declaration, or I missed up something?
Thanx in advance,

[Anon]

Well, the reason for the fault is clear:

PHP reads cars.php

The first line of cars.php it encounters tells it to start reading persons.php - it hasn't "required" persons.php yet, so it does so now.

The first line of persons.php it encounters tells it to start reading cars.php - it hasn't "required" cars.php yet, so it does so now.

Then it declares the TCar class that is described in the included cars.php

Then it declares the TPerson class that is described in the included persons.php

Then it attempts to declare the TCar class that is described in the original cars.php

But even if you get around this, you're in trouble:

$car = new TCar();
As part of the new TCar object, you create a new TPerson.

As part of this new TPerson object, you create a new TCar.

As part of this new TCar object, you create a new TPerson.

As part of this new TPerson object, you create a new TCar.

...ad infinitum.

Solution: don't create the objects in the constructor. Remember, you don't need to specify in advance what type any variable is. If you want $my->$car to contain a car object, say $my->$car = new TCar() when the occasion arises.