Bu benim kodudur:

$php_var = json_decode($json, 1);

$serializer=new XML_Serializer();
if($serializer->serialize($php_var))
$xml_string=htmlspecialchars("<?xml version='1.0' encoding='UTF-8' ?>".$serializer->getSerializedData());
echo $xml_string; 
$xml_obj = new DOMDocument;
@$xml_obj->loadXML($xml_string);

$urls=$xml_obj->getElementsByTagName('visibleUrl');
foreach($urls as $u)
      {
        echo $u->textContent."<br/>";
      }