Description:
------------
When SimpleXMLElement in run on something invalid or empty, the HTTP status code is forced to 200 and can not be influenced later on. Either this is a bug or expected behavior - in the last case, it should be: documented on http://nl2.php.net/simplexml/ + explained how to work around it.

Note: my actual PHP version is: 5.0.4

Reproduce code:
---------------
Note: php://input is empty (i.e. a direct request to the page).


$PostXML = new SimpleXMLElement('php://input');
if (empty($PostXML))
{
	header('HTTP/1.1 400 Bad Request');
}
else
{
	header('HTTP/1.1 202 Accepted');
}

Expected result:
----------------
HTTP Status Code: HTTP/1.1 400

Actual result:
--------------
HTTP Status Code: HTTP/1.1 200