DOMDocument: the saveXML return value is an empty string.

DOMDocument: example of an empty string returned by saveXML in the PHP Manual: & nbsp; $ doc & nbsp ;=& nbsp; new & nbsp; DOMDocument ('1. 0 '); // & nbsp; we & nbsp; want & n DOMDocument: saveXML returns an empty string
Examples in the PHP manual:

        $doc = new DOMDocument('1.0');
// we want a nice output
$doc->formatOutput = true;

$root = $doc->createElement('book');
$root = $doc->appendChild($root);

$title = $doc->createElement('title');
$title = $root->appendChild($title);

$text = $doc->createTextNode('This is the title');
$text = $title->appendChild($text);


echo "Saving all the document:\n";

$xmlContent = $doc->saveXML();

var_dump($xmlContent);

The output is as follows:
Saving all the document: string (72 )""

Why didn't the complete XML be printed? Thank you for your advice. Thanks! PHP saveXML shared to: format... 'data-pics = ''>
------ Solution --------------------
View in text mode

Saving all the document:
string(72) "
 

 
  
  
  This is the title
  

 
"