<?php

class MyObject
{
    public $instance = 0;

    public function __construct() {
        $this->instance = ++$this->instance;
    }

    public function __clone() {
        $this->instance = ++$this->instance;
    }
}

$obj1 = new MyObject();
var_dump($obj1);

$obj2 = clone $obj1;
var_dump($obj2);

?>