Merge branch 'PHP-8.1' into PHP-8.2

* PHP-8.1:
Fix memory leak when calling xml_parse_into_struct() twice
Fix return type of stub of xml_parse_into_struct()

Fix return type of stub of xml_parse_into_struct()

Closes GH-12253.

Use true return type for XML functions which always return true

And fix xml_parser_set_option() which didn't return false on failure.

Closes GH-9539

Do not generate CONST_CS when registering constants (#9439)

Declare ext/xml constants in stubs (#9131)

Generate optimizer func info from stubs for various extensions (#7409)

ext/hash, ext/iconv, ext/mbstring, ext/xml, ext/zlib

Not serializable flag permeation

Improve class entry generation

Related to GH-6701

Implicitly enable function entry generation when class entry generation is enabled

Closes GH-6675

Add support for generating class entries from stubs

Closes GH-6289

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Rename XmlParser to XMLParser for consistency with XMLWriter/XMLReader

Fix XmlParser classname in stubs

Update ext/xml parameter names

Closes GH-6297.

Generate arginfos

Promote warnings to exceptions in ext/gettext, ext/sysvmsg and ext/xml

Closes GH-5926

Add a bunch of missing argument types to stubs

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necess

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necessary.

This ensures that release artifacts will never try to regenerate
stubs and thus fetch PHP-Parser, as long as you do not modify any
files.

Closes GH-5739.

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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.

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal function

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal functions.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

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Generate function entries for another batch of extensions

Closes GH-5352

Verify that all stubs have a return type

Add union return types with one class

Add ext/xml stubs