Declare ext/spl constants in stubs (#9226)

Use more specific return types in SPL

Actually, abstract methods don't have a body

Fix some smaller formatting inconsistencies in stubs

Declare tentative return types in ext/spl - part 3 (#7239)

Merge branch 'PHP-8.0'

* PHP-8.0:
Fix some more ext/spl return types

Fix some more ext/spl return types

Closes GH-7242

Revert "IteratorIterator::getInnerIterator() can't return null"

This reverts commit c252420d0842b1f7ea3891695bb6de3c9ec9a57c.

This (currently) does not hold for invalid AppendIterat

Revert "IteratorIterator::getInnerIterator() can't return null"

This reverts commit c252420d0842b1f7ea3891695bb6de3c9ec9a57c.

This (currently) does not hold for invalid AppendIterators,
revert for now.

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IteratorIterator::getInnerIterator() can't return null

If ther IteratorIterator is initialized (which we check), then
zobject cannot be undef and the return value cannot be null.

Merge branch 'PHP-8.0'

Various ext/spl stub fixes

Closes GH-7215

Use typed property in RegexIterator

Generate ext/spl class entries from stubs

Closes GH-6709

Add support for generating class entries from stubs

Closes GH-6289

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Update ext/spl parameter names

Closes GH-6284.

Fix a few Iterator signatures

Closes GH-6176

Add support for `@implementation-alias` in stubs

Closes GH-6170

Add more precise type info for stubs

Closes GH-6005

Generate methods entries from stubs for ext/spl

Closes GH-5458

Add stubs for SPL iterators

Closes GH-5286