simplexml stuck parsing xml - php

Question

I am trying to parse an xml file, I can get the d3pp1:key and d3p1:values alright.
foreach ($xml_contact->Attributes->KeyValuePairOfstringanyType as $node) {
$key = (string)$node->children('d3p1', TRUE)->key;
$value = (string)$node->children('d3p1', TRUE)->value;
do_stuff($key, $value);
}
But i also need to get this 9ccaa69b-fced-e411-80da-00155d0a0806
and I am struggling to figure out how to reference it.
I have tried various incarnations along these lines
$node->children('d3p1', TRUE)->value->Id
What am I doing wrong?
<KeyValuePairOfstringanyType>
<d3p1:key>birthdate</d3p1:key>
<d3p1:value xmlns:d5p1="http://www.w3.org/2001/XMLSchema" i:type="d5p1:dateTime">1940-12-10T11:00:00Z</d3p1:value>
</KeyValuePairOfstringanyType>
<KeyValuePairOfstringanyType>
<d3p1:key>parentcustomerid</d3p1:key>
<d3p1:value i:type="EntityReference">
<Id>9ccaa69b-fced-e411-80da-00155d0a0806</Id>
<KeyAttributes xmlns:d6p1="http://schemas.microsoft.com/xrm/7.1/Contracts"/>
<LogicalName>account</LogicalName>
<Name>Test ABC</Name>
<RowVersion i:nil="true"/>
</d3p1:value>
</KeyValuePairOfstringanyType>

Answer 1

The Id element has no namespace prefix, so is in the default namespace of the document, or in no namespace if the document has no default namespace. You need to call ->children() again to switch to the right namespace, as SimpleXML is currently looking for further nodes in the namespace with prefix d3p1.
If there is no default namespace, you just need to pass NULL:
$node->children('d3p1', TRUE)->value->children(NULL)->Id