$path = 'https://www.bashinform.ru/rss/yandex.xml';

$ctx = stream_context_create([
  'http' => array('timeout' => 6)
]);

$file = file_get_contents($path, 0, $ctx);

if ($file)
{
    $data = simplexml_load_string($file);

    foreach ($data->channel->item as $item)
    {

        $namespaces = $item->getNameSpaces(true);

        if( !empty ($namespaces) )
        {

            foreach($namespaces as $namespacesKey => $namespacesValue)
            {

                $namespacesData = $item->children($namespaces[$namespacesKey]);

                foreach($namespacesData as $namespacesDataKey => $namespacesDataValue)
                {
                    $item->{$namespacesKey . ':' . $namespacesDataKey} = $namespacesDataValue;
                }

            }
        }

    }

    $data->asXml();

}