protected function _stripValues($node = null)
{
foreach ($node->childNodes as $childNode) {
if ($childNode->nodeType === XML_ELEMENT_NODE) {
/* strip children values */
if ($childNode->hasChildNodes()) {
$this->_stripValues($childNode);
}
} else {
$childNode->nodeValue = str_ireplace($this->_forbiddenValues, null, $childNode->nodeValue);
}
}
return $node;
}