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.

Annotate function aliases in stubs

Verify that all stubs have a return type

Stubs: Store information per-class

We'll need this if we want to generate method entries.

Generate function entries from stubs

If @generate-function-entries is specified in the stub file,
also generate function entries for the extension.

Currently limited to free fun

Generate function entries from stubs

If @generate-function-entries is specified in the stub file,
also generate function entries for the extension.

Currently limited to free functions only.

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Move gen_stub.php to build directory and install it so phpize can take care of it, and thus extension can use it as it is already in Makefile