/**
* Return the key of the current element
* @link http://php.net/manual/en/iterator.key.php
* @return string|integer|boolean scalar on success, or null on failure.
*/
public function key()
{
return $this->queue->key();
}
/**
* Return the key of the current element
* @link http://php.net/manual/en/iterator.key.php
* @return string|integer|boolean scalar on success, or null on failure.
*/
public function key()
{
return $this->queue->key();
}