How do you query namespaces with PHP/XPath/DOM

Question

I am trying to query an XML document that uses namespaces. I have had success with xpath without namespaces, but no results with namespaces. This is a basic example of what I was trying. I have condensed it slightly, so there may be small issues in my sample that may detract from my actual problem.

Sample XML:

<?xml version="1.0"?>
<sf:page>
     <sf:section>
          <sf:layout>
              <sf:p>My Content</sf:p>
          </sf:layout>
     </sf:section>
</sf:page>

Sample PHP Code:

<?php
$path = "index.xml";

$content = file_get_contents($path);

$dom = new DOMDocument($content);

$xpath = new DOMXPath($dom);
$xpath->registerNamespace('sf', "http://developer.apple.com/namespaces/sf");

$p = $xpath->query("//sf:p", $dom);

My result is that "p" is a "DOMNodeList Object ( )" and it's length is 0. Any help would be appreciated.

You have no namespace declaration in your XML? Missing an xmlns:sf="developer.apple.com/namespaces/sf"? — Vincent Robert
– Vincent Robert, Commented May 4, 2010 at 12:13
Vincent, that is only a result of trying to condense my code into a sample. The following xml was part of the original XML: <sl:document xmlns:sfa="developer.apple.com/namespaces/sfa" xmlns:sf="developer.apple.com/namespaces/sf" xmlns:xsi="w3.org/2001/XMLSchema-instance" xmlns:sl="developer.apple.com/namespaces/sl" sl:version="92008102400" sl:generator="slingshot" sl:app_build_date="Sep 23 2009, 18:04:26"> Maybe I am not understanding something as well. — Alsbury
– Alsbury, Commented May 4, 2010 at 12:36

unbeli · Accepted Answer · 2010-05-25 12:47:12Z

2

DOMDocument constructor does not take the contents, but version and encoding. Instead of:

$path = "index.xml";
$content = file_get_contents($path);
$dom = new DOMDocument($content);

Try this:

$path = "index.xml";
$doc = new DOMDocument();
$doc->load($path);

answered May 25, 2010 at 12:47

unbeli

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Dmytro Zavalkin · Accepted Answer · 2010-06-11 14:34:51Z

0

You must define namespace in your xml file:

<?xml version="1.0"?>
<root xmlns:sf="http://developer.apple.com/namespaces/sf">
    <sf:page>
         <sf:section>
              <sf:layout>
                  <sf:p>My Content</sf:p>
              </sf:layout>
         </sf:section>
    </sf:page>
</root>

answered Jun 11, 2010 at 14:34

Dmytro Zavalkin

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