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PHP has built-in methods for XML manipulation. You can use the Format class to convert XML to other formats, for example array or json. If your archive is a zip file, you can use the Unzip class. Other archive types are not supported.

Internally to the Format class instance, everything is an array. If your input is XML, use

$xml = Format::forge( file_get_contents( '/my/xml/file.xml', 'xml' ) );

It will not copy the xml, the xml will be parsed and stored internally in a multidimensional array. Do this so see how it is stored:

\Debug::dump($xml->to_array());

You're XML isn't parsed, so you didn't do what I wrote:

// create a format object from your XML
$xml = Format::forge($myxmlstring, 'xml');

// get the xml as an array
$array = $xml->to_array();

// dump the array
Debug::dump($array);