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

Check that "tokenizer" extension is available in gen_stub.php

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necess

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necessary.

This ensures that release artifacts will never try to regenerate
stubs and thus fetch PHP-Parser, as long as you do not modify any
files.

Closes GH-5739.

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Annotate internal functions with the mixed type

Closes GH-5618

manage ZEND_DEP_FALIAS in gen_stub

Make gen_stub parallelism safe

If PHP-Parser is not yet installed, make sure we don't try to
install it N times in parallel.

Make gen_stub.php compatible with PHP 7.1 again

Not worth bumping requirements over this...

Generate method entries for ext/dom

Closes GH-5374

Fix an undefined class error running gen_stub in php8

For whatever reason, php 8 would not have loaded the subsequent classes when
running `php build/gen_stub.php path/to/filename.php`.

Fix an undefined class error running gen_stub in php8

For whatever reason, php 8 would not have loaded the subsequent classes when
running `php build/gen_stub.php path/to/filename.php`.
I assume it didn't load the classes immediately because there's a possibility
the code before it would throw.
(Probably because __toString was added recently and prevents early binding)

Also, fix a typo

Closes GH-5369

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Generate method entries from stubs for a couple of extensions

Closes GH-5368

Add support for generating method entries from stubs

Closes GH-5363

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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Move variable declaration closer to its usage

Improve gen_stub.php

Closes GH-5350
Add support for generating deprecated function entries, as well as forward declaration
of function aliases.