Курс от Башки

<?php

class People
{
	private $name;
	
	public function setName($name)
	{
		$this->name = $name;
	}
	
	public function getName()
	{
		return $this->name;
	}
}

$p1 = new People();
$p2 = new People();

echo '<pre>', var_dump($p1), var_dump($p2), '</pre>';

object(People)#1 (1) {
["name":"People":private]=>
NULL
}
object(People)#2 (1) {
["name":"People":private]=>
NULL
}

$p1 = new People();
$p2 = $p1;

object(People)#1 (1) {
["name":"People":private]=>
NULL
}
object(People)#1 (1) {
["name":"People":private]=>
NULL
}