How to convert this php array into xml?

I am using cakephp v2.5. I would like to convert an array into xml. The array looks like this;

$Items = array(      (int) 0 => array(          'Item' => array(              'id' => '2'          )      ),      (int) 1 => array(          'Item' => array(              'id' => '4'          )      )  )

To convert this array to xml, the following php code was run;

$xmlObject = Xml::fromArray(array('response' => $Items ));  echo $xmlObject->asXML();  

Unfortunately, the following error was encountered;

Warning (2): SimpleXMLElement::__construct(): Entity: line 3: parser error : Extra content at the end of the document [CORE\Cake\Utility\Xml.php, line 221]

I think I found the problem but still not have the solution. The output of array('response' => $Items) returns a maximum depth reached message. Anyone can advise?

How can this array be converted into xml in php or cakephp (using cake's built-in functions)?

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