Bug #55531 [Opn->Nab]: Vertical tabs ignored by XMLWriter
Edit report at https://bugs.php.net/bug.php?id=55531&edit=1
ID: 55531
Updated by: cmb@php.net
Reported by: brianlmoon@php.net
Summary: Vertical tabs ignored by XMLWriter
-Status: Open
+Status: Not a bug
Type: Bug
Package: XML Writer
Operating System: Linux
PHP Version: 5.3.8
-Assigned To:
+Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
This issue is fixed as of libxml2 2.9.11:
Warning: simplexml_load_string(): Entity: line 2: parser error : PCDATA invalid Char value 11
Warning: simplexml_load_string(): <test>This data contains a vertical tab</test>
Warning: simplexml_load_string(): ^
Previous Comments:
------------------------------------------------------------------------
[2021-04-01 14:42:17] cmb@php.net
While \v is indeed invalid for XML 1.0, it is valid for XML 1.1.
We could entity-encode such characters for 1.0 documents, and that
likely wouldn't cause a BC break, but we could also leave that to
libxml2 (to my knowledge, handling of invalid characters is not
even documented by them). But if we manually entity-encode, we
should make sure to keep that consistent (at least for XMLWriter,
but likely for all bundled XML extension as well). Not sure.
And we should decide how to handle NUL bytes. Currently, the
strings are truncated, what doesn't appear to be intentional.
------------------------------------------------------------------------
[2011-08-29 16:01:35] pajoye@php.net
XML 1.0 this character is not valid. Not sure if we should allow it, .net 2.x
allows them optionally using settings.CheckCharacters = true;.
But that|s something libxml deals with, PHP's xml extensions only rely on it to
parse input or generate data.
------------------------------------------------------------------------
[2011-08-29 15:52:18] brianlmoon@php.net
Description:
------------
When text contains vertical tabs, XMLWriter silently ignores them and generates invalid XML. This is
not an issue where the text is invalid UTF-8. It is valid UTF-8 data. Vertical tabs are simply not
allowed in XML by rule. I would expect XMLWriter to encode it as it would any other character not
allowed in XML. I suspect that
Test script:
---------------
<?php
$xml = new XmlWriter();
$xml->openMemory();
$xml->startDocument('1.0', 'UTF-8');
$xml->writeElement("test", "This data contains a \vvertical tab");
$xml->endElement();
$data = $xml->outputMemory(true);
$sxml = simplexml_load_string($data);
?>
Expected result:
----------------
Either an error or valid XML.
Actual result:
--------------
Invalid XML is silently created. For example, SimpleXML::addchild() throws a warning:
SimpleXMLElement::asXML(): xmlEscapeEntities : char out of range when a vertical tab is present and
the node is not added.
------------------------------------------------------------------------
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