Getting encoding="UTF-8" standalone="yes" using PHP asXML and SimpleXMLElement [duplicate]

Question

I am using following code to get an XML file when a php page is called:

i.e. when you enter http://example.com/strtoxmp.php, it will return you xml, based on following coding:

  $xml = new SimpleXMLElement("<feed/>");

  $feed = $xml;
  $feed->addChild('resultLength', "1");
  $feed->addChild('endIndex', "1");

  $item = $feed->addChild('item',"");
  $item->addChild('contentId', "10031");
  $item->addChild('contentType', "Talk");
  $item->addChild('synopsis', "$newTitle" );
  $item->addChild('runtime', ' ');
}

Header('Content-type: text/xml;  charset:UTF-8; ');

print($xml->asXML());

and it is working fine. It produces following xml:

<?xml version="1.0"?>
<feed>
<resultLength>1</resultLength>
<endIndex>1</endIndex>
<contentId>10031</contentId>
<contentType>Talk</contentType>
<synopsis>Mark Harris - Find Your Wings</synopsis>
<runtime> </runtime>
</item>
</feed>

But I need

< ?xml version="1.0" encoding="UTF-8" standalone="yes"?>

instead of

< ?xml version="1.0"?>

Answer 1

To set the XML declaration, just add it to the string you pass to the SimpleXMLElement constructor:

$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" '
  . 'standalone="yes"?><feed/>');

This should output the following:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<feed/>