มีปัญหากเกี่ยวกับอัพโหลดไฟล์ XML อะ - This XML file does not appear to have any style information associated with it.

header('Content-Type: application/xml');
$xmlstr =
'<?xml version="1.0" encoding="UTF-8"?>
<Return>
  <status>200</status>
  <Description>success</Description>
</Return>';

$sxe = new SimpleXMLElement($xmlstr);

//$output = $sxe->asXML();
echo $sxe->asXML();

$xml_open = '<'.'?xml';
$xml_close = '?'.'>';
$xmlstr = $xml_open . ' version="1.0" encoding="UTF-8"'.$xml_close.'
<tag>data</tag>';