Make the $num_points parameter of php_imagepolygon optional

That parameter is mostly useless in practise, and likely has been
directly ported from the underlying `gdImagePolygon()` and f

Make the $num_points parameter of php_imagepolygon optional

That parameter is mostly useless in practise, and likely has been
directly ported from the underlying `gdImagePolygon()` and friends,
which require that parameter since the number of elements of the point
array would otherwise be unknown. Typical usages of `imagepolygon()`,
`imageopenpolygon()` and `imagefilledpolygon()` pass `count($points)/2`
or hard-code this value as literal. Since explicitly specifying this
parameter is annoying and error-prone, we offer the possibility to omit
it, in which case the `$points` array must have an even number of
elements, and the number of points is calculated as `count($points)/2`.

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Implement union types

According to RFC: https://wiki.php.net/rfc/union_types_v2

The type representation now makes use of both the pointer payload
and the type mask at the same t

Implement union types

According to RFC: https://wiki.php.net/rfc/union_types_v2

The type representation now makes use of both the pointer payload
and the type mask at the same time. Additionall, zend_type_list is
introduced as a new kind of pointer payload, which is used to store
multiple class types. Each of the class types is a tagged pointer,
which may be either a class name or class entry. The latter is only
used for typed properties, while arguments/returns will instead use
cache slots. A type list can contain a mix of both names and CEs at
the same time, as not all classes may be resolvable.

One thing this is missing is support for union types in arginfo
and stubs, which I want to handle separately.

I've also dropped the special object code from the JIT implementation
for now -- I plan to add this back in a different form at a later time.
For now I did not want to include non-trivial JIT changes together
with large functional changes.

Another possible piece of follow-up work is to implement "iterable"
as an internal alias for "array|Traversable". I believe this will
eliminate quite a few special-cases that had to be implemented.

Closes GH-4838.

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Remove support for array_key_exists() with objects

Update documentation/comment for GH-4860

Fix folding for the new helper method.

Clarify comment in UPGRADING:
The performance on associative arrays would also improve,
as lo

Update documentation/comment for GH-4860

Fix folding for the new helper method.

Clarify comment in UPGRADING:
The performance on associative arrays would also improve,
as long as no offsets were unset (no gaps).
Packed arrays can have gaps.

Closes GH-4873.
[ci skip]

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Remove ability to unbind $this of closures if used

This was deprecated in PHP 7.4, removing it for PHP 8.0.

Fix miscellaneous typos in docs and error messages

Closes GH-4863.

Optimize array_slice for packed arrays with large offsets

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instea

Optimize array_slice for packed arrays with large offsets

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instead of looping and skipping 100000 times.

Add a new test of array_slice handling unset offsets.

Closes GH-4860.

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Allow array_splice() length to be null

Document the changes to substr functions

Fix and undeprecate ReflectionType::__toString()

Add deprecated _ZendTestClass::__toString() method to preserve
an existing test.

ReflectionType::__toString() will now return a

Fix and undeprecate ReflectionType::__toString()

Add deprecated _ZendTestClass::__toString() method to preserve
an existing test.

ReflectionType::__toString() will now return a complete
representation of the type, as it should have originally. Users
that relied on nullability being absent should have been pushed
to ReflectionNamedType::getName() by the deprecation of
ReflectionType::__toString() in PHP 7.1 / PHP 7.4.

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Promote "Cannot use parent" to fatal error

Add fdiv() function

The fdiv() function is part of the fmod() / intdiv() family. It
implements a floating-point division with IEEE-754 semantics.
That is, division by zero is conside

Add fdiv() function

The fdiv() function is part of the fmod() / intdiv() family. It
implements a floating-point division with IEEE-754 semantics.
That is, division by zero is considered well-defined and does not
trigger any kind of diagnostic. Instead one of INF, -INF or NAN
will be returned, depending on the case.

This is in preparation for throwing DivisionByZeroError from the
standard division operator.

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Use clean shutdown on uncaught exception

Replace "unexpected character" warning with ParseError

Closes GH-4767.

Fix #72374: remove_path strips first char of filename

Convert some notices to warnings

Part of https://wiki.php.net/rfc/engine_warnings.

Convert GD Resources to objects

Convert "Only arrays and Traversables can be unpacked" into Error

Promote write "use scalar as array" warning to Error

Convert "Illegal offset type" warnings to exceptions

Convert "cannot add element" warning to exception

Throw Error when writing property of non-object

This removes object auto-vivification support.

This also means that we can remove the corresponding special
handling for typed pr

Throw Error when writing property of non-object

This removes object auto-vivification support.

This also means that we can remove the corresponding special
handling for typed properites: We no longer need to check that a
property is convertible to stdClass if such a conversion might
take place indirectly due to a nested property write.

Additionally OBJ_W style operations now no longer modify the
object operand, and as such we no longer need to treat op1 as a
def in SSA form.

The next step would be to actually compile the whole LHS of OBJ_W
operations in R rather than W mode, but that causes issues with
SimpleXML, whose object handlers depend on the current compilation
structure.

Part of https://wiki.php.net/rfc/engine_warnings.

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Remove unused parameter

The `$use_include_path` parameter doesn't make sense for
`tidy_repair_string()`, and actually unused, so we remove it.

Remove unused parameter

Cf. <https://bugs.php.net/78579>.

Don't make argument nullable based on AST null initializer

Closes GH-4720.