Remove some incorrect mixed parameter types

Zend parameter renames amendment

Closes GH-6228

Use C zpp for get_class_vars()

Add a few missing parameter types in stubs

Related to GH-5627

Cleanup argument handling of Zend functions and methods

Closes GH-5847

Use ZPP callable check in zend built in functions

Use correct ZPP mechanism in get_class_methods()

From now on, instead of returning null, an exception is thrown when
not a string or an object is passed to the function.

Closes

Use correct ZPP mechanism in get_class_methods()

From now on, instead of returning null, an exception is thrown when
not a string or an object is passed to the function.

Closes GH-5792

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Add ZPP macros for class name or object parameters

Closes GH-5647

Annotate internal functions with the mixed type

Closes GH-5618

Add get_resource_id() function

Behavior is same as for (int) $resource, just under a clearer
name. Also type-safe, in that the parameter actually needs to
be a resource.

Clo

Add get_resource_id() function

Behavior is same as for (int) $resource, just under a clearer
name. Also type-safe, in that the parameter actually needs to
be a resource.

Closes GH-5427.

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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 zend_builtin_functions FEs from stubs

Promote some warnings to Errors in Zend basic functions

Closes GH-5325

Make get_defined_vars() always return an array

GH-5025

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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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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