undefined function domxml_new_doc() when using Google Checkout API sandbox credentials
<p><strong>Here is my code:</strong></p>

<pre><code>// Create the &lt;item&gt; tag if this is the first item to be created
if ($dom_items_obj == "")
{
    $dom_items_obj = domxml_new_doc("1.0");
    $dom_items_obj-&gt;append_child($dom_items_obj-&gt;create_element("items"));
}
</code></pre>

<p><strong>And the error:</strong></p>

<blockquote>
  <p>Fatal error: Call to undefined function domxml_new_doc() </p>
</blockquote>
