Fix GH-16473: dom_import_simplexml stub is wrong

It's been wrong since PHP 8.0 at least, and the signature was inherited
in 8.4-dev to the new DOM methods.

Closes GH-16489.

Fix phpdoc for DOMDocument load methods

Closes GH-13763.

[RFC] Improve callbacks in ext/dom and ext/xsl (#12627)

Change return type of registerNodeClass to true (#12960)

Handle libxml2 OOM more consistently (#11927)

This is a continuation of commit c2a58ab07d, in which several OOM error
handling was converted to throwing an INVALID_STATE_ERR DOMException

Handle libxml2 OOM more consistently (#11927)

This is a continuation of commit c2a58ab07d, in which several OOM error
handling was converted to throwing an INVALID_STATE_ERR DOMException.
Some places were missed and they still returned false without an
exception, or threw a PHP_ERR DOMException.
Convert all of these to INVALID_STATE_ERR DOMExceptions. This also
reduces confusion of users going through documentation [1].

Unfortunately, not all node creations are checked for a NULL pointer.
Some places therefore will not do anything if an OOM occurs (well,
except crash).
On the one hand it's nice to handle these OOM cases.
On the other hand, this adds some complexity and it's very unlikely to
happen in the real world. But then again, "unlikely" situations have
caused trouble before. Ideally all cases should be checked.

[1] https://github.com/php/doc-en/issues/1741

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Fix ext/dom object hierarchy

gen_stub.php references classes inside namespaces relatively

[RFC] DOM HTML5 parsing and serialization support (#12111)

Deduplicate ParentNode and ChildNode interface implementations using @implementation-alias

The entry points are duplicated: they add bloat and make it easier to forget
to change somethin

Deduplicate ParentNode and ChildNode interface implementations using @implementation-alias

The entry points are duplicated: they add bloat and make it easier to forget
to change something. Make maintenance easier by using @implementation-alias.
Also, this has the nice side-effect of slightly reducing the amount of
code and binary size.

Closes GH-12158.

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Add DOMNode::compareDocumentPosition() (#12146)

Reference: https://dom.spec.whatwg.org/#dom-node-comparedocumentposition

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

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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