Declare ext/xmlreader constants in stubs (#9133)

Declare tentative return types for ext/xmlreader

Relates to GH-6995

Declare XMLReader properties

Closes GH-6741

Generate class entries from stubs for com, standard, xmlreader, xmlwriter, xsl, zip, Zend

Closes GH-6706

Update ext/xsl parameter names

Additionally normalize to using $namespace rather than $uri for
namespace parameters, including in XMLReader and XMLWriter. I went
with that one as it

Update ext/xsl parameter names

Additionally normalize to using $namespace rather than $uri for
namespace parameters, including in XMLReader and XMLWriter. I went
with that one as it is currently used by DOM, SimpleXML and XSL --
and our DOM parameter names follow the DOM specification.

Closes GH-6295.

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Review parameter names in ext/xmlreader

Closes GH-6255.

Throw from XmlReader::expand() if DOM extension missing

Otherwise it is hard to uphold the arginfo contract for this
function -- we cannot simply mirror the zpp call, as the class
en

Throw from XmlReader::expand() if DOM extension missing

Otherwise it is hard to uphold the arginfo contract for this
function -- we cannot simply mirror the zpp call, as the class
entry it is based on does not exist.

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Update php_xmlreader.stub.php

XMLReader::getAttributeNs() can no longer return false

Promote warnings to exceptions in ext/xmlreader

Closes GH-6021

Fix UNKNOWN default values in ext/xml

Generate function entries from stubs for a couple of extensions

Migrates ext/standard, ext/tidy, ext/tokenizer,
ext/xml, ext/xml_reader, and ext/xml_writer. Closes GH-5381.