> I'm not sure PHP lets you have a pointer to another object visible at 
> the user layer. If you do
>   $x['hello'] = $y
> as far as the user is concerned, $x['hello'] and $y are two different 
> values. So $y['hello'] = $y doesn't form a circular reference, as far as 
> I can remember.  I'll try it out as soon as I boot over to Linux.

PHP has "references":

$a =& $b;

This behaves like Unix hardlinks. "$a and $b are completely equal here, 
that's not $a pointing to $b or vice versa, that's $a and $b pointing to 
the same place"

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