Fix phpdoc for DOMDocument load methods

Closes GH-13763.

Fix GH-8996: DOMNode serialization on PHP ^8.1

PHP 8.1 introduced a seemingly unintentional BC break in ca94d55a19 by
blocking the (un)serialization of DOM objects.
This was done bec

Fix GH-8996: DOMNode serialization on PHP ^8.1

PHP 8.1 introduced a seemingly unintentional BC break in ca94d55a19 by
blocking the (un)serialization of DOM objects.
This was done because the serialization never really worked and just
resulted in an empty object, which upon unserialization just resulted in
an object that you can't use.

Users can however implement their own serialization methods, but the
commit made that impossible as the ACC flag gets passed down to the
child class. An approach was tried in #10307 with a new ACC flag to
selectively allow serialization with subclasses if they implement the
right methods. However, that was found to be too ad hoc.

Instead, let's abuse how the __sleep and __wakeup methods work to throw
the exception instead. If the child class implements the __serialize /
__unserialize method, then the throwing methods won't be called.
Similarly, if the child class implements __sleep and __wakeup, then
they're overridden and it doesn't matter that they throw.

For the user, this PR has the exact same behaviour for (sub)classes that
don't implement the serialization methods: an exception will be thrown.
For code that previously implemented subclasses with these methods, this
approach will make that code work again. This approach should be both BC
preserving and unbreak user's code.

Closes GH-12388.

For the test:
Co-authored-by: wazelin <contact@sergeimikhailov.com>

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Fix json_encode result on DOMDocument

According to https://www.php.net/manual/en/class.domdocument:
When using json_encode() on a DOMDocument object the result will be
that of en

Fix json_encode result on DOMDocument

According to https://www.php.net/manual/en/class.domdocument:
When using json_encode() on a DOMDocument object the result will be
that of encoding an empty object.

But this was broken in 8.1. The output was `{"config": null}`.
That's because the config property is defined with a default value of
NULL, hence it was included. The other properties are not included
because they don't have a default property, and nothing is ever written
to their backing field. Hence, the JSON encoder excludes them.
Similarly, `(array) $doc` would yield the same `config` key in the
array.

Closes GH-11840.

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Corrections to return type of loading DOM documents

Implement DOMElement::toggleAttribute()

ref: https://dom.spec.whatwg.org/#dom-element-toggleattribute

Closes GH-11696.

Implement DOMElement::insertAdjacent{Element,Text} (#11700)

* Implement DOMElement::insertAdjacent{Element,Text}

ref: https://dom.spec.whatwg.org/#dom-element-insertadjacentelement

Implement DOMElement::insertAdjacent{Element,Text} (#11700)

* Implement DOMElement::insertAdjacent{Element,Text}

ref: https://dom.spec.whatwg.org/#dom-element-insertadjacentelement
ref: https://dom.spec.whatwg.org/#dom-element-insertadjacenttext

Closes GH-11700.

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Implement DOMNode::isEqualNode()

Since we still support obsoleted nodes in our implementation, this uses
the old spec to match the old nodes; and this uses the new spec for
nodes sti

Implement DOMNode::isEqualNode()

Since we still support obsoleted nodes in our implementation, this uses
the old spec to match the old nodes; and this uses the new spec for
nodes still defined in the living spec.
When unclear, the behaviour was cross-verified with Firefox.

References:
https://dom.spec.whatwg.org/#dom-node-isequalnode (for everything still in the living spec)
https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/DOM3-Core.html#core-Node3-isEqualNode (for old nodes removed from the living spec)

Closes GH-11690.

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Implement DOMNode::parentElement and DOMNameSpaceNode::parentElement

ref: https://dom.spec.whatwg.org/#parent-element

Closes GH-11679.

Implement DOMNode::isConnected and DOMNameSpaceNode::isConnected

ref: https://dom.spec.whatwg.org/#dom-node-isconnected

Closes GH-11677.

Implement DOMElement::id

ref: https://dom.spec.whatwg.org/#dom-element-id

Closes GH-11701.

Implement DOMParentNode::replaceChildren()

ref: https://dom.spec.whatwg.org/#dom-parentnode-replacechildren

Implement DOMElement::className

ref: https://dom.spec.whatwg.org/#dom-element-classname

Closes GH-11691.

Implement DOMNode::getRootNode()

ref: https://dom.spec.whatwg.org/#dom-node-getrootnode

Closes GH-11693.

Implement DOMElement::getAttributeNames()

ref: https://dom.spec.whatwg.org/#dom-element-getattributenames

Implement DOMNode::contains()

ref: https://dom.spec.whatwg.org/#dom-node-contains

Implement DOMDocument::adoptNode()

For the past 20 years this threw a "not yet implemented" exception. But
the function was actually there (albeit not documented) and could be called...

Implement DOMDocument::adoptNode()

For the past 20 years this threw a "not yet implemented" exception. But
the function was actually there (albeit not documented) and could be called...

Closes GH-11333.

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Fix return value in stub file for DOMNodeList::item

Not explicitly documenting the possibility of returning DOMElement causes
the Intelephense linter (a popular PHP linter with ~9 millio

Fix return value in stub file for DOMNodeList::item

Not explicitly documenting the possibility of returning DOMElement causes
the Intelephense linter (a popular PHP linter with ~9 million downloads:
https://marketplace.visualstudio.com/items?itemName=bmewburn.vscode-intelephense-client)
to think this code is bad:

$xp->query("whatever")->item(0)->getAttribute("foo");

DOMNode does not have getAttribute (while DOMElement does).
Documenting the DOMElement return type should fix Intelephense's linter.

Closes GH-11342.

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Change DOMCharacterData::appendData return type to true (#10690)

Rename @cname to @cvalue in stubs (#9043)

@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as

Rename @cname to @cvalue in stubs (#9043)

@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as @cvalue would be more appropriate.

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Declare ext/dom constants in stubs (#8676)

Add some stub related todo comments

Fix a few more classsynopsis generation issues

Closes GH-7480

Make a few unuseful DOMEntity properties readonly (#7406)

DOMCharacterData::$data and DOMAttr::$value are writable

Mark DOM classes as not serializable