php xpath problems

Question

I am trying to parse a blogspot feed using xpath but it doesnt seem to be working with anything that I try. I am not sure if it is because of the namespaces or what but I was hoping someone could help me. Here is the code:

    $xml = simplexml_load_file('http://feeds.feedburner.com/blogspot/MKuf');

$next = $xml->xpath("//link[@rel='next']");
print_r($next);

This is just returning an empty array and it should not be. I tried it doing just link or just entry and it still is returning empty. The only one I can run on it that works is *. Any help is appreciated.

Your xpath seems to be wrong it actually returns zero elements. What do you try to accomplish? — Alex Bailey
– Alex Bailey, Commented Mar 18, 2011 at 15:43
The document has a default namespace which you have to register before you can query it with XPath. — Gordon
– Gordon, Commented Mar 18, 2011 at 15:54
Thats what I was thinking gordon but I tried that as well and it did not seem like it was working either, but maybe I didnt do it right (an example would be nice). I am trying to select the root link element with the rel attribute of next. — ngreenwood6
– ngreenwood6, Commented Mar 18, 2011 at 15:59

Gordon · Accepted Answer · 2011-03-18 16:01:18Z

13

Like already said in the comment to you question, the document has a default namespace which you have to register before you can query it with XPath.

Since the linked duplicate only shows how to do it with DOM, I'll add an SimpleXml example

$feed = simplexml_load_file('http://feeds.feedburner.com/blogspot/MKuf');
$feed->registerXPathNamespace('f', 'http://www.w3.org/2005/Atom');
foreach ($feed->xpath('//f:link[@rel="next"]') as $link) {
    var_dump($link);
}

Manual Page: http://de.php.net/manual/de/simplexmlelement.registerxpathnamespace.php

Live Demo

answered Mar 18, 2011 at 16:01

Gordon

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Philip Hanson · Accepted Answer · 2011-03-18 16:02:54Z

4

As Gordon said, you need to register the XML document's default namespace, like this:

$xml->registerXPathNamespace('default', 'http://www.w3.org/2005/Atom');

And then use the default prefix to refer to normal elements:

$next = $xml->xpath("//default:link[@rel='next']");

Newer versions may allow you to define the default ('') namespace. See http://www.qc4blog.com/?p=281 for more information.

answered Mar 18, 2011 at 16:02

Philip Hanson

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2 Comments

ngreenwood6 Over a year ago

thanks i actually discovered that as well. I tried doing it with the '' one before and thats why it was failing.

Philip Hanson Over a year ago

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