gistfile1.php

<?php

class SmartXML implements ArrayAccess
{
  private var $xml;

  public __construct($xml)
  {
    $this->xml = $xml;
  }

  public function offsetExists($key)
  {
  }

  public function offsetGet($key)
  {
  }

  public function offsetSet($key, $value)
  {
  }

  public function offsetUnset($key)
  {
  }
}