PHP magic __get only allows itself on the stack once per property

gistfile1.php

<?php
class Dumb {
	protected $prop;
	function __get($p) {
		if ($p === 'prop') {
			$this->prop = new Dumber($this);
			return $this->prop;
		}
	}
}
class Dumber {
	public $prop;
	function __construct(Dumb $dumb) {
		$this->prop = $dumb->prop;
	}
}

$d = new Dumb();

var_dump($d->prop);