<?php


class Simple {

	private $foo;

	public function Simple($string) {
		$this->foo = $string;
	}

	public function setFoo($foo) {
		$this->foo = $foo;
	}

	public function __toString() { // override magic method
		return $this->foo;
	}

	public function addBar() {
		$this->foo .= ' bar';
		return $this; // return yourself
	}
}


$s0 = new Simple('s0');
$s0->addBar()->addBar()->addBar()->addBar();
echo "s0 = $s0 <br /><br />";




$s1 = new Simple('s1'); // same as: $s1 =& new Simple('s1');
$s2 = new Simple('s2');


$s3 = $s1; // same as: $s3 =& $s1;
$s3->setFoo('s3 was reassigned from s1');


$s4 = clone $s2;
$s4->setFoo('s4 was cloned from s2');


printf("s1 = %s<br />", $s1);
printf("s2 = %s<br />", $s2);
printf("s3 = %s<br />", $s3);
printf("s4 = %s<br />", $s4);
echo '<br />';
echo '<br />';






class Ext {
	public function Ext() {

	}

	public function doSimple($simple) { // same as: (&$simple) {
		$simple->setFoo('ext did something');
	}	
}


$s5 = new Simple('s5');
$s6 = new Simple('s6 passed as clone');


$ext = new Ext();
$ext->doSimple($s5);
$ext->doSimple(clone $s6);


printf("s5 = %s<br />", $s5);
printf("s6 = %s<br />", $s6);


/*
generates:
--------------


s0 = s0 bar bar bar bar 


s1 = s3 was reassigned from s1
s2 = s2
s3 = s3 was reassigned from s1
s4 = s4 was cloned from s2




s5 = ext did something
s6 = s6 passed as clone


*/


?>