Bug #74491 [Com]: XMLWriter adds to many namespace definitions

Edit report at https://bugs.php.net/bug.php?id=74491&edit=1 ID: 74491 Comment by: paul at sparrowhawkcomputing dot com Reported by: subjective@php.net Summary: XMLWriter adds to many namespace definitions Status: Open Type: Bug Package: XML Writer PHP Version: 7.1.4 Block user comment: N Private report: N New Comment: I very much agree that this should be fixed; altho I suspect the problem is actually with xmlwrite.c in libxml, hence it's probably not be up to PHP to fix it :-( But maybe the PHP powers that be can put some pressure on libxml to fix it. Until it does get fixed, there is a fairly simple workaround: If you know there is an in-scope namespace decl aready written (i.e., on an ancestor element) then simply pass null as the namespaceURI argument to XMLWriter::writeElementNS() and kin. Previous Comments: ------------------------------------------------------------------------ [2017-04-23 10:44:25] subjective@php.net Description: ------------ XMLWriter adds namespace definitions to any element node that is created by by a namespace aware method. It does not take definitions on parent nodes into account. The resulting XML output is valid and has even the same meaning, but it is a lot larger then needed. Test script: --------------- <?php $_ = new XMLWriter(); $_->openMemory(); $_->setIndent(2); $_->startDocument(); $_->startElementNS('a', 'foo', 'urn:a'); $_->writeElementNS('a', 'bar', 'urn:a', 'foobar'); $_->endElement(); $_->endDocument(); echo $_->outputMemory(); Expected result: ---------------- <?xml version="1.0"?> <a:foo xmlns:a="urn:a"> <a:bar>foobar</a:bar> </a:foo> Actual result: -------------- <?xml version="1.0"?> <a:foo xmlns:a="urn:a"> <a:bar xmlns:a="urn:a">foobar</a:bar> </a:foo> ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74491&edit=1