Test how passing object by reference works in PHP

test.php

<?php

class A
{
	private $id = 0;
	
	public function __construct($id)
	{
		$this->id = $id;
	}
	
	public function setId($id)
	{
		$this->id = $id;
	}
}

function x(A &$a)
{
	$b = new A(3);
	
	$a = $b;
	//$a->setId(5);
}

$a = new A(1);
print_r($a);
x($a);
print_r($a);