I have the following xml that I'm trying to parse and get the Account Data from

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:SearchResults xmlns="http://www.intuit.com/sb/cdm/v2" xmlns:ns2="http://www.intuit.com/sb/cdm/qbo" xmlns:ns3="http://www.intuit.com/sb/cdm/qbopayroll/v1">
    <ns2:CdmCollections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Accounts">
        <Account>
            <Id idDomain="QBO">31</Id>
            <SyncToken>0</SyncToken>
            <MetaData>
                <CreateTime>2010-02-16T18:03:50-08:00</CreateTime>
                <LastUpdatedTime>2010-02-16T18:03:50-08:00</LastUpdatedTime>
            </MetaData>
            <Name>Accounts Payable</Name>
            <Subtype>AccountsPayable</Subtype>
            <CurrentBalance>34002.00</CurrentBalance>
        </Account>
        <Account>
            <Id idDomain="QBO">36</Id>
            <SyncToken>0</SyncToken>
            <MetaData>
                <CreateTime>2011-01-11T13:24:14-08:00</CreateTime>
                <LastUpdatedTime>2011-01-11T13:24:14-08:00</LastUpdatedTime>
            </MetaData><Name>Accounts Receivable (A/R)</Name>
            <Subtype>AccountsReceivable</Subtype>
            <CurrentBalance>1125.85</CurrentBalance>
        </Account>
    </ns2:CdmCollections>
    <ns2:Count>10</ns2:Count>
    <ns2:CurrentPage>1</ns2:CurrentPage>
</ns2:SearchResults>

The following code sometimes work such that the I can see that children tags and values of CdmCollections. However, it doesnt always work for the same query.

Looking at the raw xml I can see the namespaces change, e.g. sometimes ns2="http://www.intuit.com/sb/cdm/qbo" (works) and other times ns2 = "http://www.intuit.com/sb/cdm/v2" (doesnt work). I thought by using the namespaces array I could handle that issue but its not working. Any suggestions how I can fix this?

$account_xml = new SimpleXMLElement($account_query_response);


$namespaces = $account_xml->getNamespaces(true);
$account_xml->registerXPathNamespace('c', $namespaces["ns2"]);

$x = 0;
foreach($account_xml->xpath('//c:SearchResults') as $search) {
    echo "<br>row " . $x;
    $search->registerXPathNamespace('c', $namespaces["ns2"]);

    var_dump($search->xpath('//c:CdmCollections'));
}