Add support for readonly classes (#7305)

RFC: https://wiki.php.net/rfc/readonly_classes

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Implement Stringable automatically for internal classes

Implement Stringable automatically for internal classes

Requiring all internal classes (including those from 3rd-party
extensions) to implement Stringable if they provide __toString()

Implement Stringable automatically for internal classes

Requiring all internal classes (including those from 3rd-party
extensions) to implement Stringable if they provide __toString()
is too error prone. Case in point, our _ZendTestClass test class
was not doing so, resulting in preloading test failures after
recent changes.

Instead we automatically implement Stringable, the same as we do
for userland classes. We still allow explicit implementations,
but ignore them (normally they would result in an error due to
duplicate interface implementation). Finally, we need to be
careful about not trying to implement Stringable on Stringable
itself.

In some cases this changes the interface order, in particular the
automatic Stringable implementation will now come first.

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Revert unintended tentative return type change

I accidentally made the return type of all Reflection*::getAttributes() methods tentative, even though they have already been declared natively.

Declare tentative return types for ext/reflection

Closes GH-7011

Get rid of private final methods (#6892)

Implement enums

RFC: https://wiki.php.net/rfc/enumerations

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

Closes GH-6489.

Used typed properties for reflection $name and $class

These are read-only properties, and Reflection makes sure to assign
only strings.

Require stubs to declare return types for magic methods when possible

Closes GH-6376

don't display default value for variadic

Make the $filter parameter of ReflectionClass::get*Constants() nullable

Use ZPP instead of custom type checks

We can add these types as a native type declaration to stubs as a side-effect. Closes GH-6068

Add a few missing parameter types in stubs

Related to GH-5627

Cleanup argument handling in ext/reflection

Closes GH-5850

Add $filter parameter for ReflectionClass::(getConstants|getReflectionConstants)

This solves [#79628](https://bugs.php.net/79628).

Similar to `ReflectionClass::getMethods()` and `Re

Add $filter parameter for ReflectionClass::(getConstants|getReflectionConstants)

This solves [#79628](https://bugs.php.net/79628).

Similar to `ReflectionClass::getMethods()` and `ReflectionClass::getProperties()`,
this new `$filter` argument allows the filtering of constants defined in a class by
their visibility.

For that, we create three new constants for `ReflectionClassConstant`:

* `IS_PUBLIC`
* `IS_PROTECTED`
* `IS_PRIVATE`

Closes GH-5649.

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Add Attributes

Co-authored-by: Martin Schröder <m.schroeder2007@gmail.com>

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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Remove <default> prefix from reflection dump

This really doesn't add anything, and only makes for confusing
terminology. Only marking properties as dynamic is sufficient.

Display property default value in reflection dumps

Define Stringable with __toString():string method

Remove the deprecated reflection export methods

Closes GH-5188

Revert "Replace @param annotations with type declarations"

This reverts commit c31029f335ca1b453af799805c43c37e959ad555.

Replace @param annotations with type declarations

Add stubs for ext-reflection

Merge branch 'PHP-7.4'