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These APIs have been superseded by ReflectionParameter::getType()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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Generate method entries for ext/session and ext/reflection

Closes GH-5376

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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Regenerate reflection stubs

Define Stringable with __toString():string method

Remove the deprecated reflection export methods

Closes GH-5188

Revert "Replace @param annotations with type declarations"

This reverts commit c31029f335ca1b453af799805c43c37e959ad555.

Replace @param annotations with type declarations

Always invoke zpp in ReflectionProperty::getValue/isInitialized

Make sure we still perform a zpp check for the static case, and
also always enforce that the parameter is ?object. Otherwi

Always invoke zpp in ReflectionProperty::getValue/isInitialized

Make sure we still perform a zpp check for the static case, and
also always enforce that the parameter is ?object. Otherwise we
violate the specified signature.

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Rename reflection stub file

Where possible, the stub file should match the name of the C file,
so that the build system integration automatically recompiles it.