php - Getting SimpleXMLElement to include the encoding in output

Question

This:

$XML = new SimpleXMLElement("<foo />");
echo($XML->asXML());

...outputs this:

<?xml version="1.0"?>
<foo/>

But I want it to output the encoding, too:

<?xml version="1.0" encoding="UTF-8"?>
<foo/>

Is there some way to tell SimpleXMLElement to include the encoding attribute of the <?xml?> tag? Aside from doing this:

$XML = new SimpleXMLElement("<?xml version='1.0' encoding='utf-8'?><foo />");
echo($XML->asXML());

Which works, but it's annoying to have to manually specify the version and encoding.

Assume for the purposes of this question that I cannot use DOMDocument instead.

Answer 1

You can try this, but you must use simplexml_load_string for $xml

$xml // Your main SimpleXMLElement
$xml->addAttribute('encoding', 'UTF-8');

Or you can still use other means to add the encoding to your output.

Simple Replacement

$outputXML=str_replace('<?xml version="1.0"?>', '<?xml version="1.0" encoding="UTF-8"?>', $outputXML);

Regular Expressions

$outputXML=preg_replace('/<?s*xml([^s]*)?>/' '<?xml $1 encoding="UTF-8"?>', $outputXML);

DOMDocument - I know you said you don't want to use DOMDocument, but here is an example

$xml=dom_import_simplexml($simpleXML);
$xml->xmlEndoding='UTF-8';
$outputXML=$xml->saveXML();

You can wrap this code into a function that receives a parameter $encoding and adds it to the