Add system ID entropy API

The `zend_system_id` is a (true global) system ID that fingerprints a process state. When extensions add engine hooks during MINIT/startup, entropy is added the sys

Add system ID entropy API

The `zend_system_id` is a (true global) system ID that fingerprints a process state. When extensions add engine hooks during MINIT/startup, entropy is added the system ID for each hook. This allows extensions to identify that changes have been made to the engine since the last PHP process restart.

Closes GH-5871

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Remove support for EXT_NOP

This is an annoying edge case that regularly gets broken. As we're
not aware of significant users of this API, and there are other
ways to hook this, remov

Remove support for EXT_NOP

This is an annoying edge case that regularly gets broken. As we're
not aware of significant users of this API, and there are other
ways to hook this, remove support for EXT_NOP.

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Rename zend_error_notify APIs to zend_observer_error*

Fix mismatch between macro and struct definition

Improve type declarations for Zend APIs

Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functio

Improve type declarations for Zend APIs

Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functions which return true/false (1/0)
Use zend_result return type for functions which return SUCCESS/FAILURE as they don't follow normal boolean semantics

Closes GH-6002

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Drop various unused macros/APIs

Also convert_libmagic_pattern() to return a zend_string*

Closes GH-6029

Add UPGRADING.INTERNALS notes for zend_object* changes

Closes GH-5953.

Add more argument types to stubs

Closes GH-5943

Revert "Prepare for PHP 8.1"

This reverts commit 1ab4d0e6b7abb67d5a01ce3327bf973772271fb2.
This reverts commit a359635cb1a4df8b5137a506c88c4cb102acac0e.

Prepare for PHP 8.1

[skip ci] Fix grammar/typo nits in docs

The PHP error message says "well-formed", not "well formed"

Fixes GH-5920

Document the signature change of zend_get_closure_method_def()

Remove PHP_CHECK_GCC_ARG()

In favor of AX_CHECK_COMPILE_FLAG(), which we bundle since at least
PHP 7.

Closes GH-5904.

Add error notification callbacks to UPGRADING.INTERNALS

Remove type argument from zend_get_zval_ptr

As pointed out by Levi, this is unused, and we already changed
the signature of this function for PHP 8.

Use consistent types

uint32_t type for argument count
size_t for length of char*
zend_bool for a zval bool arg

Closes GH-5845

Add upgrading note

[ci skip]

Voidify some ZEND_API functions

Closes GH-5805

Remove no_separation flag

[skip ci] add upgrade note

Closes GH-5798

[ci skip] (Hopefully) clarify meaning

Document zend_hash_sort and zend_ts_hash_sort signature change

Cf. <https://github.com/php/php-src/pull/3936>.

Update UPGRADING.INTERNALS re: removed --disable-inline-optimization switch

This build configuration switch was removed in 3a19726bce.

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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Fix typo