Pr8_6.7.php

<!DOCTYPE html>
<html>
<body>
<?php
class Obj{
	public $id;
	public $size;
	public $color;
	function __construct($id,$size,$color){
		$this->id=$id;
		$this->size=$size;
		$this->color=$color;
	}
	function __clone(){
		$green=$this->color->green;
		$red=$this->color->blue;
		$blue=$this->color->red;
		$this->color=new Color($green,$blue,$red);
	}
}
class Color{
	public $green;
	public $blue;
	public $red;
	function __construct($green,$blue,$red){
		$this->green=$green;
		$this->blue=$blue;
		$this->red=$red;
	}
}
$color=new Color(23,42,223);
$obj1=new Obj(23,"small",$color);
$obj2=clone $obj1;
$obj2->id++;
$obj2->color->red=255;
$obj2->size="big";
echo "<pre>";print_r($obj1);
echo "<pre>";print_r($obj2);
?>
</body>
</html>