PHP DOMDocument getting Attribute of Tag

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The example you provided should not generate an error. I tested it and $linkthumb contained the string “example text string” as expected

Ensure the media namespace is defined in the returned XML otherwise DOMDocument will error out.

If you are getting a specific error, please edit your post to include it

Edit:

Try the following code:

$xmldoc = new DOMDocument();
$xmldoc->load('api response address');
foreach ($xmldoc->getElementsByTagName('item') as $feeditem) {
    $nodes = $feeditem->getElementsByTagName('file');
    $linkthumb = $nodes->item(0)->getAttribute('data');
    echo $linkthumb;
}

You may also want to look at SimpleXML and Xpath as it makes reading XML much easier than DOMDocument.

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