Declare ext/spl constants in stubs (#9226)

Narrow ArrayIterator::key() return type

This can only return string|int|null, not any key type.

Declare tentative return types for ext/spl - part 1 (#7115)

Merge branch 'PHP-8.0'

Various ext/spl stub fixes

Closes GH-7215

Merge branch 'PHP-8.0'

* PHP-8.0:
Fix ArrayObject::exchangeArray() return type

Fix ArrayObject::exchangeArray() return type

This method cannot return null.

Generate ext/spl class entries from stubs

Closes GH-6709

Update ext/spl parameter names

Closes GH-6284.

Add support for `@implementation-alias` in stubs

Closes GH-6170

Add more precise type info for stubs

Closes GH-6005

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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Fix #79653 Unexpected error for ArrayIterator::ksort()

Closes GH-5644

Generate methods entries from stubs for ext/spl

Closes GH-5458

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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Merge branch 'PHP-7.4'

* PHP-7.4:
Fix #69264: __debugInfo() ignored while extending SPL classes

Add some stubs for SPL

Closes GH-5245