DOMDocument simple GetElementsByTagName wont work? - php

Question

$xml = '<?xml version="1.0" encoding="UTF-8"?>
<stw:ThumbnailResponse xmlns:stw="http://www.shrinktheweb.com/doc/stwresponse.xsd">
<stw:Response>
<stw:ThumbnailResult>
<stw:Thumbnail Exists="true">http://imagelink.com</stw:Thumbnail>
<stw:Thumbnail Verified="false">delivered</stw:Thumbnail>
</stw:ThumbnailResult>
<stw:ResponseStatus>
<stw:StatusCode>refresh</stw:StatusCode>
</stw:ResponseStatus>
<stw:ResponseTimestamp>
<stw:StatusCode>1413812009</stw:StatusCode>
</stw:ResponseTimestamp>
<stw:ResponseCode>
<stw:StatusCode>HTTP:200</stw:StatusCode>
</stw:ResponseCode>
<stw:CategoryCode>
<stw:StatusCode></stw:StatusCode>
</stw:CategoryCode>
<stw:Quota_Remaining>
<stw:StatusCode>132</stw:StatusCode>
</stw:Quota_Remaining>
<stw:Bandwidth_Remaining>
<stw:StatusCode>999791</stw:StatusCode>
</stw:Bandwidth_Remaining>
</stw:Response>
</stw:ThumbnailResponse>';
$dom = new DOMDocument;
$dom->loadXML($xml);
$result = $dom->getElementsByTagName('stw:Thumbnail')->item(0)->nodeValue;
$status = $dom->getElementsByTagName('stw:Thumbnail')->item(0)->nodeValue;
echo $result;
Having the above code should output http://imagelink.com and $status should hold "delivered" - but none of these work instead I am left with the error notice that:
Trying to get property of non-object
I have tried different xml parsing alternatives like simplexml (but that did not work when the tag names have : in it ) and i tried looping through the each scope in the xml (ThumbNailresponse, response and then thumbnailresult) without luck.
How can i get the values inside stw:Thumbnail?

Answer 1

You need to specify a namespace and the method DOMDocument::getElementsByTagName can't handle it. In the manual:
The local name (without namespace) of the tag to match on.
You can use DOMDocument::getElementsByTagNameNS instead:
$dom = new DOMDocument;
$dom->loadXML($xml);
$namespaceURI = 'http://www.shrinktheweb.com/doc/stwresponse.xsd';
$result = $dom->getElementsByTagNameNS($namespaceURI, 'Thumbnail')->item(0)->nodeValue;

Answer 2

Using simple xml you could use ->children() method on this one:
$xml = simplexml_load_string($xml_string);
$stw = $xml->children('stw', 'http://www.shrinktheweb.com/doc/stwresponse.xsd');
echo '<pre>';
foreach($stw as $e) {
print_r($e);
// do what you have to do here
}

Answer 3

This code actually runs just fine for me ---
Typically, that sort of error means you may've made a typo on your $dom object - double check it and try again.
Also, it is notable that you'll want to change the item(0) to item(1) when you're setting your $status variable.
$result = $dom->getElementsByTagName('stw:Thumbnail')->item(0)->nodeValue;
$status = $dom->getElementsByTagName('stw:Thumbnail')->item(0)->nodeValue;