Add missing param to DatePeriod::__construct()

The signature is very overloaded, but takes at most four params,
not three.

Update outdated arginfo hashes

Introduce InternalIterator

Userland classes that implement Traversable must do so either
through Iterator or IteratorAggregate. The same requirement does
not exist for internal class

Introduce InternalIterator

Userland classes that implement Traversable must do so either
through Iterator or IteratorAggregate. The same requirement does
not exist for internal classes: They can implement the internal
get_iterator mechanism, without exposing either the Iterator or
IteratorAggregate APIs. This makes them usable in get_iterator(),
but incompatible with any Iterator based APIs.

A lot of internal classes do this, because exposing the userland
APIs is simply a lot of work. This patch alleviates this issue by
providing a generic InternalIterator class, which acts as an
adapater between get_iterator and Iterator, and can be easily
used by many internal classes. At the same time, we extend the
requirement that Traversable implies Iterator or IteratorAggregate
to internal classes as well.

Closes GH-5216.

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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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Convert UNKNOWN default values to null in ext/date

Closes GH-5509

Generate method entries from stubs for a couple of extensions

Closes GH-5368

Add support for generating method entries from stubs

Closes GH-5363

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 from stubs for a couple of extensions

Closes GH-5347

Adding DateTime(Immutable)::createFromInterface()

These are like

DateTime::createFromImmutable()
DateTimeImmutable::createFromMutable()

but accept any DateTimeI

Adding DateTime(Immutable)::createFromInterface()

These are like

DateTime::createFromImmutable()
DateTimeImmutable::createFromMutable()

but accept any DateTimeInterface instead.

Closes GH-5016.

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Support single class unions in gen stubs

Fix DateTimeImmutable stubs

These were referencing the arginfo from the functions, instead of
the methods, which isn't right, as the functions have return types.

Add union return types for function stubs

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime constructor also accepts zero arguments
* hash_update_file() stream context is optional
* xmlwriter_write_dtd_entity() $isparam argument is optional

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Update the date class arginfo the new format

Add missing parameters to __set_state() methods

Closes GH-4526.

Make uninitialized DateTime an Error

This avoids many spurious false return values.

Generate arginfo from PHP stub files

Signature stubs for internal functions are specified in xyz.stub.php,
from which we generate actual arginfo structures in xyz_arginfo.h.
This fil

Generate arginfo from PHP stub files

Signature stubs for internal functions are specified in xyz.stub.php,
from which we generate actual arginfo structures in xyz_arginfo.h.
This file then needs to be included in the implementation appropriately.

Arginfo from stubs can be regenerated using scripts/dev/gen_stub.php.
However, this should also automatically happen when the stub file is
modified.

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