XML file validation using PHP

I am using DOMDocument for xml file validation. It takes more than 30 minutes in validating a 67MB 开发者_StackOverflow社区xml file. Is there any other way to improve this checking time?

Have you tried XMLReader? I recall this one as being pretty decent, though I don't think I tested it on anything as large as 67 MB.

try {
    libxml_use_internal_errors(true);
    $oXml = new SimpleXMLElement($sXml, LIBXML_DTDVALID);
} catch (Exception $e) {
    $aErrors = libxml_get_errors();
}