When you want to process an XML file in PHP, there are two possibilities. Either we use simpleXML or we go through DOMDocument. In this article I would deal more specifically with simplexml.
To load a file, just use the method simplexml_load_file
$xml - simplexml_load_file ($file);
By doing so, you get a SimpleXMLElement.
If the xml has a namespace, it is imperative to add it to the element, otherwise you won’t be able to browse it.
$xml-registerXPathNamespace ('n', 'http://www.w3.org/TR/html4/');
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Then it is possible to recover the necessary data
we can also, if desired, use xpath. It is very important that each node has namespace, in our example “n”
echo $xml-xpath ('/n:movie/n:plot')
A very good article can be found on php.net.