How to Correctly Parse Namespaced XML with SimpleXML's XPath?

How to Parse XML with Namespace Using SimpleXML

Problem:

When attempting to parse XML with namespaces using SimpleXML, encountering issues with the registerXPathNamespace() method.

XML Structure:

<root xmlns:event="http://www.webex.com/schemas/2002/06/service/event">
  <event:event>
    <event:sessionKey>...</event:sessionKey>
    ...
  </event:event>
  ...
</root>

Example Xpath Query:

Attempting to extract 'event:sessionKey' values using:

$xml->registerXPathNamespace('e', 'http://www.webex.com/schemas/2002/06/service/event');
$event->xpath('//e:sessionKey')

Solution:

The issue lies in the necessity of both the namespace prefix ('e') and the full namespace URI in the XPath query, even without using registerXPathNamespace().

Corrected Code:

$xml = new SimpleXMLElement($r);

foreach ($xml->xpath('//event:event') as $event) {
  var_export($event->xpath('event:sessionKey'));
}

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