Implement enums

RFC: https://wiki.php.net/rfc/enumerations

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

Closes GH-6489.

Used typed properties for reflection $name and $class

These are read-only properties, and Reflection makes sure to assign
only strings.

Generate class entries from stubs for phar, posix, pspell, readline, reflection, session, shmop

Closes GH-6692

Fix ReflectionClass::getConstants() stub

If `zval_update_constant_ex()` fails, an exception has already been
thrown, so we clarify that in the implementation as well.

Closes GH-

Fix ReflectionClass::getConstants() stub

If `zval_update_constant_ex()` fails, an exception has already been
thrown, so we clarify that in the implementation as well.

Closes GH-6557.

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Revert "Make ReflectionUnionType final"

This reverts commit ef6adb4e27853eb19bf50bad6486311920d6af7b.

Per Ondrej's comment, this is already being used by BetterReflection
adapto

Revert "Make ReflectionUnionType final"

This reverts commit ef6adb4e27853eb19bf50bad6486311920d6af7b.

Per Ondrej's comment, this is already being used by BetterReflection
adaptors, ugh.

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Make ReflectionUnionType final

Closes GH-6384

Require stubs to declare return types for magic methods when possible

Closes GH-6376

Make the $filter parameter of ReflectionClass::get*Constants() nullable

Reflection param renames amendment

Closes GH-6230

Add support for `@implementation-alias` in stubs

Closes GH-6170

Check `ReflectionReference::fromArrayElement` with union types

ReflectionReference::fromArrayElement(array $array, int|string $key): ?ReflectionReference
is going to be its official sign

Check `ReflectionReference::fromArrayElement` with union types

ReflectionReference::fromArrayElement(array $array, int|string $key): ?ReflectionReference
is going to be its official signature for PHP 8.0.

Closes GH-5651

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Refactor ReflectionMethod::__construct()

Closes GH-6098

Use ZPP instead of custom type checks

We can add these types as a native type declaration to stubs as a side-effect. Closes GH-6068

Add a few missing parameter types in stubs

Related to GH-5627

Cleanup argument handling in ext/reflection

Closes GH-5850

Make ReflectionGenerator final

This class is not safe against malicious extension / instantiation.

ReflectionMethod::invoke() object is not optional

Implement Attribute Amendments.

RFC: https://wiki.php.net/rfc/attribute_amendments

Support for attribute grouping is left out, because the short
attribute syntax RFC will likely

Implement Attribute Amendments.

RFC: https://wiki.php.net/rfc/attribute_amendments

Support for attribute grouping is left out, because the short
attribute syntax RFC will likely make it obsolete.

Closes GH-5751.

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Add $filter parameter for ReflectionClass::(getConstants|getReflectionConstants)

This solves [#79628](https://bugs.php.net/79628).

Similar to `ReflectionClass::getMethods()` and `Re

Add $filter parameter for ReflectionClass::(getConstants|getReflectionConstants)

This solves [#79628](https://bugs.php.net/79628).

Similar to `ReflectionClass::getMethods()` and `ReflectionClass::getProperties()`,
this new `$filter` argument allows the filtering of constants defined in a class by
their visibility.

For that, we create three new constants for `ReflectionClassConstant`:

* `IS_PUBLIC`
* `IS_PROTECTED`
* `IS_PRIVATE`

Closes GH-5649.

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Implement "Constructor Promotion" RFC

RFC: https://wiki.php.net/rfc/constructor_promotion

Closes GH-5291.

Add Attributes

Co-authored-by: Martin Schröder <m.schroeder2007@gmail.com>

Annotate internal functions with the mixed type

Closes GH-5618

Deprecate old ReflectionParameter type declaration APIs

This deprecates:

ReflectionParameter::isArray()
ReflectionParameter::isCallable()
ReflectionParameter::ge

Deprecate old ReflectionParameter type declaration APIs

This deprecates:

ReflectionParameter::isArray()
ReflectionParameter::isCallable()
ReflectionParameter::getClass()

These APIs have been superseded by ReflectionParameter::getType()
since PHP 7.0. Types introduced since that time are not available
through the old APIs, and their behavior is getting increasingly
confusing. This is how they interact with PHP 8 union types:

* isArray() will return true if the type is array or ?array,
but not any other union type
* Same for isCallable().
* getClass() will return a class for T|int etc, as long as the
union only contains a single type. T1|T2 will return null.

This behavior is not particularly reasonable or useful, and will
get more confusing as new type system extensions are added.

Closes GH-5209.

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Use int|string Fast ZPP macro in Reflection

Moreover, throw a more appropriate ValueError in case the integer
position provided is less than 0.

Closes GH-5513

Completely remove disabled functions from function table

Currently, disabling a function only replaces the internal
function handler with one that throws a warning, and a few
places

Completely remove disabled functions from function table

Currently, disabling a function only replaces the internal
function handler with one that throws a warning, and a few
places in the engine special-case such functions, such as
function_exists. This leaves us with a Schrödinger's function,
which both does not exist (function_exists returns false) and
does exist (you cannot define a function with the same name).
In particular, this prevents the implementation of robust
polyfills, as reported in https://bugs.php.net/bug.php?id=79382:

if (!function_exists('getallheaders')) {
function getallheaders(...) { ... }
}

If getallheaders() is a disabled function, this code will break.

This patch changes disable_functions to remove the functions from
the function table completely. For all intents and purposes, it
will look like the function does not exist.

This also renders two bits of PHP functionality obsolete and thus
deprecated:

* ReflectionFunction::isDisabled(), as it will no longer be
possible to construct the ReflectionFunction of a disabled
function in the first place.
* get_defined_functions() with $exclude_disabled=false, as
get_defined_functions() now never returns disabled functions.

Fixed bug #79382.

Closes GH-5473.

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