PHP: DOMNode::appendChild to an array of Elements

Question

I am using DOMDocument to parse an XML file. I loop through the different Elements and see if any of them is missing and I fill an array with a createElement, with the error message. At the end I'm trying to appendChild that array but I always get the same error message:

Uncaught exception 'DOMException' with message 'Wrong Document Error'
DOMNode->appendChild(Object(DOMElement))
1 {main}
thrown in /xxx/xxx.php on line 235
PHP Fatal error: Call to undefined method DOMElement::item() in /xxx/xxx.php on line 235.

the code is as follow:

$SMQuery = new DOMDocument();
$SMQuery->loadXML($params);
$response = $SMQuery->createElement('SMreply');
$errors = array();
if (!$reqtyp = $SMQuery->getElementsByTagName("tag1"))
{$errors[] = $SMQuery->createElement('error', 'tag1 Element is missing');}
if (!$reqtyp = $SMQuery->getElementsByTagName("tag2"))
{$errors[] = $SMQuery->createElement('error', 'tag2 Element is missing');}
......

if(!empty($errors))
{
 foreach($errors as $error) {
  $response->appendChild($error); <==== this line is causing the error !!!
 }
}

Any help is much appreciated. Cheers, Riki.

Answer 1

You don't show where $response is being defined, but if it's the result of another new DOMDocument(), then that explains you error - you can't add nodes from one DOM object to another directly. It has to be imported first via ->importNode(). Only after that can you actually append it.