DateTime:: and DateTimeImmutable::getTimestamp() may return false

Fix ext/date stubs

Closes GH-6523.

Require stubs to declare return types for magic methods when possible

Closes GH-6376

Verify parameter names of function aliases

Closes GH-6335

Improve parameter names in ext/intl

Closes GH-6309

Add some ValueErrors to ext/date

Closes GH-5613

Add another round of missing parameter types to stubs

Closes GH-5950

Last pass of 'More consistent parameter names for date/time functions'

Another pass of improving ext/date argument names

More consistent parameter names for date/time functions

Add missing param to DatePeriod::__construct()

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

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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Convert UNKNOWN default values to null in ext/date

Closes GH-5509

Add support for generating method entries from stubs

Closes GH-5363

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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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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