SimplePie::__call

	 *
	 * This is better suited for {@link http://php.net/for for()} loops, whereas
	 * {@see get_items()} is better suited for
	 * {@link http://php.net/foreach foreach()} loops.
	 *
	 * @see get_item_quantity()
	 * @since Beta 2
	 * @param int $key The item that you want to return. Remember that arrays begin with 0, not 1
	 * @return SimplePie_Item|null
	 */
	public function get_item($key = 0)
	{
		$items = $this->get_items();
		if (isset($items[$key]))
		{
			return $items[$key];
		}

		return null;
	}