<?php

class Cd
{
	public $name;
 
    public function __construct($a)
    {
        $this->name = $a;
    }
}

$a=new Cd(1);

$b=$a;

echo "$a->name\n";
unset($a);

if(isset($a))
  echo "live a\n";
else
	echo "die a\n";


if(isset($b))
  echo "live b\n";
else
	echo "die b\n";

echo "$b->name\n";

var_dump($a);
var_dump($b);