Description:
------------
XMLReader never returns XMLReader::XML_DECLARATION nodes in a call to XMLReader::read() (silently skips them, however, complains about well-formedness if the XML declaration is not at the very beginning of the XML, ie, after a comment or the DTD)

Reproduce code:
---------------
<?php
$xmld = <<<EOT
<?xml version="1.0" encoding="UTF-8" ?>
<!-- Prolog comment 1-->
<!DOCTYPE chapter [
<!ELEMENT chapter (title,para+)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT para (#PCDATA)>
]>
<!-- prolog comment 2-->
<!-- prolog comment 3-->
<chapter><title>Title</title><para>Para</para></chapter>
EOT;

$xml = new XMLReader();
$xml->XML($xmld);
while($xml->read()) {
  echo "$xml->nodeType \n";
}
?>

Expected result:
----------------
17  <- the nodeType value for XMLReader::XML_DECLARATION
8
10
8
8
1
1
3
15
1
3
15
15

Actual result:
--------------
8
10
8
8
1
1
3
15
1
3
15
15