Declare the missing true return types (#13709)

Fix GH-9186 @strict-properties can be bypassed using unserialization (#9354)

* Emit deprecation warnings when adding dynamic properties to classes during unserialization - this will become a

Fix GH-9186 @strict-properties can be bypassed using unserialization (#9354)

* Emit deprecation warnings when adding dynamic properties to classes during unserialization - this will become an Error in php 9.0.
(Adding dynamic properties in other contexts was already a deprecation warning - the use case of unserialization was overlooked)
* Throw an error when attempting to add a dynamic property to a `readonly` class when unserializing
* Add new serialization methods `__serialize`/`__unserialize` for SplFixedArray to avoid creating deprecated dynamic
properties that would then be added to the backing fixed-size array
* Don't add named dynamic/declared properties (e.g. $obj->foo) of SplFixedArray to the backing array when unserializing
* Update tests to declare properties or to expect the deprecation warning
* Add news entry

Co-authored-by: Tyson Andre <tysonandre775@hotmail.com>

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Declare tentative return types for ext/spl - part 2

Closes GH-7235

Fix bug #81112: Implement JsonSerializable for SplFixedArray

This returns an array for SplFixedArray JSON encoding, which
is more appropriate than an object with integer string keys.

Fix bug #81112: Implement JsonSerializable for SplFixedArray

This returns an array for SplFixedArray JSON encoding, which
is more appropriate than an object with integer string keys.

Closes GH-7117.

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Generate ext/spl class entries from stubs

Closes GH-6709

Update ext/spl parameter names

Closes GH-6284.

SplFixedArray is Aggregate, not Iterable

One strange feature of SplFixedArray was that it could not be used in nested foreach
loops. If one did so, the inner loop would overwrite the ite

SplFixedArray is Aggregate, not Iterable

One strange feature of SplFixedArray was that it could not be used in nested foreach
loops. If one did so, the inner loop would overwrite the iteration state of the outer
loop.

To illustrate:

$spl = SplFixedArray::fromArray([0, 1]);
foreach ($spl as $a) {
foreach ($spl as $b) {
echo "$a $b";
}
}

Would only print two lines:

0 0
0 1

Use the new InternalIterator feature which was introduced in ff19ec2df3 to convert
SplFixedArray to an Aggregate rather than Iterable. As a bonus, we get to trim down
some ugly code! Yay!

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Add more precise type info for stubs

Closes GH-6005

Generate methods entries from stubs for ext/spl

Closes GH-5458

Add some stubs for SPL

Closes GH-5245