return xml gz archive

function getXmlGzArchive()
{
    $xml = simplexml_load_file('https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist-90d.xml');
    $xml = $xml->xpath('//Cube[@currency][@rate]');
    $archive = [];
    foreach ($xml as $node) {
        $archive[(string)$node['time']][(string)$node['currency']] = (float)$node['rate'];
    }
    return $archive;
}