PHP DOMXPath Query by node name not finding anything - php

Question

I'm trying to understand the basics of DOMXPath in PHP. I have an XML file that starts with what's below.
<?xml version="1.0"?>
<ListFinancialEventsResponse xmlns="http://mws.amazonservices.com/Finances/2015-05-01">
<ListFinancialEventsResult>
<FinancialEvents>
<ShipmentEventList>
<ShipmentEvent>
I'm trying to get the FinancialEvents tags using the below PHP with a few different xpath query attempts but neither works.
$file = file_get_contents('file.xml');
$dom = new DOMDocument();
$dom->loadXML($file);
$xpath = new DOMXPath($dom);
$xpath->registerNamespace('m','http://mws.amazonservices.com/Finances/2015-05-01');
$events = $xpath->query('FinancialEvents'); // Attempt 1
$events = $xpath->query('m:FinancialEvents');// Attempt 2
According to the docs, these should return all nodes with name 'FinancialEvents'. I know that it works if I use the below xpath query
$events = $xpath->query('//m:FinancialEvents');
So my question is, why don't my first 2 queries work? Isn't the element <FinancialEvents> also a node of the same name?
Thanks

Answer 1

Not tested but you could try:
$query='//ListFinancialEventsResult/FinancialEvents';
$events=$xp->query( $query );
if( !empty( $events ) && $events->length > 0 ){
foreach( $events as $event ){
echo $event->nodeValue;
}
}
I suspect that the first couple of queries do not return a nodelist is because you are effectively trying to find nodes FinancialEvents at root level ~ if you supplied a reference node ( which would be a DOMNode ListFinancialEventsResult )for the query then it would work.