Not doing PHP correctly?

gistfile1.aw

<?php

class Dummy {
  public $foos = array();

  public function & getFoos() {
    return $this->foos; 
  }

  public function addFoo($foo) {
    array_push($this->foos, $foo);
  }

}

$d = new Dummy();
var_dump($d);
$d->addFoo("a");
$d->addFoo("b");
$d->addFoo("c");
var_dump($d); //has 3
$foos = &$d->getFoos(); //mystery solved
unset($foos[1]);
var_dump($d);