Problem getting XPath working in PHP - php

Question

I've been trying to access the NHS API using different methods to read in the XML.
Here is a snippet of the XML:
<feed xmlns:s="http://syndication.nhschoices.nhs.uk/services" xmlns="http://www.w3.org/2005/Atom">
<title type="text">NHS Choices - GP Practices Near Postcode - W1T4LB - Within 5km</title>
<entry>
<id>http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/27369</id>
<title type="text">Fitzrovia Medical Centre</title>
<updated>2011-08-20T22:47:39Z</updated>
<link rel="self" title="Fitzrovia Medical Centre" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/27369?apikey="/>
<link rel="alternate" title="Fitzrovia Medical Centre" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=303A92EF-EC8D-496B-B9CD-E6D836D13BA2"/>
<content type="application/xml">
<s:organisationSummary>
<s:name>Fitzrovia Medical Centre</s:name>
<s:address>
<s:addressLine>31 Fitzroy Square</s:addressLine>
<s:addressLine>London</s:addressLine>
<s:postcode>W1T6EU</s:postcode>
</s:address>
<s:contact type="General">
<s:telephone>020 7387 5798</s:telephone>
</s:contact>
<s:geographicCoordinates>
<s:northing>182000</s:northing>
<s:easting>529000</s:easting>
<s:longitude>-0.140267259415255</s:longitude>
<s:latitude>51.5224357586293</s:latitude>
</s:geographicCoordinates>
<s:Distance>0.360555127546399</s:Distance>
</s:organisationSummary>
</content>
</entry>
</feed>
I've been using this PHP to access it:
<?php
$feedURL = 'http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/postcode/W1T4LB.xml?apikey=&range=5';
$raw = file_get_contents($feedURL);
$dom = new DOMDocument();
$dom->loadXML($raw);
$xp = new DOMXPath($dom);
$result = $xp->query("//entry"); // select all entry nodes
print $result->item(0)->nodeValue;
?>
Problem is I have no results, the $raw data is present, but the $dom never gets filled with the string XML. This means the XPath won't work.
Also... for bonus points: how do I access the <s:Name> tag using XPath in this instance??
Appreciate the help as always.
Edit:
Here is the resulting PHP that worked fine, thanks to #Andrej L
<?php
$feedURL = 'http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/postcode/W1T4LB.xml?apikey=&range=5';
$xml = simplexml_load_file($feedURL);
$xml->registerXPathNamespace('s', 'http://syndication.nhschoices.nhs.uk/services');
$result = $xml->xpath('//s:name');
foreach ($result as $title)
{
print $title . '<br />';
}
?>

Answer 1

I think it's better to use SimpleXml library. see http://www.php.net/manual/en/book.simplexml.php
Register namespace using http://www.php.net/manual/en/simplexmlelement.registerxpathnamespace.php
Use xpath method. See http://www.php.net/manual/en/simplexmlelement.xpath.php