questions from page "Reference Counting Basics"

[Adi Mutu <adi_mutu06@xxxxxxxxx>]

Hello,

I was reading http://www.php.net/manual/en/features.gc.refcounting-basics.php, and i saw this:

"The xdebug_debug_zval() function does not show this, but you could see it by also displaying the memory pointer."

My question is, how can you get the memory pointer of a php variable? 

Thanks,
A.