Indirect modification of overloaded property ... を再現させるコード

indirectmod.php

<?php

class ebisan
{
  public $kani = array();

  public function __get($name)
  {
    return $this->kani[$name];
  }

  public function __set($name, $value)
  {
    return $this->kani[$name] = $value;
  }
}

$ebisan = new ebisan();
$ebisan->teriyaki = 'tetete';
$ebisan->teriyakis = array('tetete');

// Notice でない
var_dump($ebisan->teriyaki);
unset($ebisan->teriyaki);
var_dump($ebisan->teriyaki);

echo '========================='.PHP_EOL;

// Notice でる
var_dump($ebisan->teriyakis);
unset($ebisan->teriyakis[0]);
var_dump($ebisan->teriyakis); // 消えてない