Verify generated files are up to date in CI

Closes GH-8295

Various ext/spl stub fixes

Closes GH-7215

Properly render 2+ namespaces functions in build/gen_stub.php

Affects ZEND_NS_FE

Add test cases of the global function

Backported to php 8.0 from GH-6664

Add support for union types for internal functions

This closes the last hole in the supported types for internal
function arginfo types. It's now possible to represent unions of
mult

Add support for union types for internal functions

This closes the last hole in the supported types for internal
function arginfo types. It's now possible to represent unions of
multiple classes. This is done by storing them as TypeA|TypeB and
PHP will then convert this into an appropriate union type list.

Closes GH-6581.

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Fix refentry attribute replacing

Add support for generating methodsynopses from stubs

Closes GH-6367

Fix parameter stats generation

[ci skip]

Require stubs to declare return types for magic methods when possible

Closes GH-6376

Verify parameter names of function aliases

Closes GH-6335

Avoid namespaced class symbol clashes in gen_stub

Add the namespace prefix (using underscores) to both the arginfo
name and the method declaration name.

Support "static" type in gen_stub

Add @generate-legacy-arginfo tag

Improve gen_stub.php - drop --legacy option, generate file is exists - add --help option - add debug "Saved ..." message

Support specifying linkage for generate-function-entries

The linkage can be specified as the argument to the
@generate-function-entries tag. Test this on zend_test.

Add partial namespace support to gen_stub

Add gen_stub --legacy flag

This flag generates an arginfo file that discards all type and
default value information. As such, it is compatible with old
(and very old) PHP versions.

Add gen_stub --legacy flag

This flag generates an arginfo file that discards all type and
default value information. As such, it is compatible with old
(and very old) PHP versions.

Intended for use by extensions to generate one arginfo file for
PHP 8 and one for older versions.

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Add option to print parameter name stats to gen_stub

Add support for `@implementation-alias` in stubs

Closes GH-6170

Add Z_PARAM_ITERABLE and co

Check for duplicate names in gen_stub.php

With named arguments in php 8.0, it's important that php's modules
or PECL extensions using gen_stub.php don't generate functions
with dupli

Check for duplicate names in gen_stub.php

With named arguments in php 8.0, it's important that php's modules
or PECL extensions using gen_stub.php don't generate functions
with duplicate names.

Warn if a parameter name is repeated,
even if the last occurrence is a variadic parameter

Closes GH-6035

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Remove custom hacks from gen_stub.php after PHP-Parser upgrade

Update PHP-Parser from 4.3.0 to 4.9.0

PHP-Parser 4.3.0 failed to recognize that the `match` keyword could be
used as a class constant name.
4.9.0 also adds support for keywords in na

Update PHP-Parser from 4.3.0 to 4.9.0

PHP-Parser 4.3.0 failed to recognize that the `match` keyword could be
used as a class constant name.
4.9.0 also adds support for keywords in namespaced names.
See https://github.com/nikic/PHP-Parser/releases

So forcing regeneration of spl_iterators.stub.php failed.

PECL extensions using gen_stub.php would also be affected
by the same issue.

```
ext/spl/spl_iterators.stub.php
public function __construct(Iterator $iterator, string $regex,
int $mode = self::MATCH, int $flags = 0, int $preg_flags = 0) {}
```

Testing: I successfully regenerated stubs by setting forceRegeneration to true
and running `touch **/*.stub.php; make`.
The stubs did not change, as expected.

Closes GH-6036

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Check missing parameter types in stubs

[skip ci] Closes GH-5627

Support class+mask union for internal argument

Add support for forcing regeneration of arginfo files

Closes GH-5795