Align DOMChildNode parent checks with spec

Closes phpGH-11905.

Author: nielsdos

NEWS

@@ -4,6 +4,7 @@ PHP                                                                        NEWS
 
 - DOM:
   . adoptNode now respects the strict error checking property. (nielsdos)
+  . Align DOMChildNode parent checks with spec. (nielsdos)
 
 - Opcache:
   . Avoid resetting JIT counter handlers from multiple processes/threads.

UPGRADING

@@ -46,6 +46,14 @@ PHP 8.3 UPGRADE NOTES
     iterating over the WeakMap (reachability via iteration is considered weak).
     Previously, such entries would never be automatically removed.
 
+- DOM:
+  . DOMChildNode::after(), DOMChildNode::before(), DOMChildNode::replaceWith()
+    on a node that has no parent is now a no-op instead of a hierarchy exception,
+    which is the behaviour spec demands.
+  . Using the DOMParentNode and DOMChildNode methods without a document now works
+    instead of throwing a HIERARCHY_REQUEST_ERR DOMException. This is in line with
+    the behaviour spec demands.
+
 - FFI:
   . C functions that have a return type of void now return null instead of
     returning the following object object(FFI\CData:void) { }

ext/dom/tests/DOMChildNode_methods_without_parent.phpt

@@ -0,0 +1,44 @@
+--TEST--
+DOMChildNode methods without a parent
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+$doc = new DOMDocument;
+$doc->loadXML(<<<XML
+<?xml version="1.0"?>
+<container>
+    <child/>
+</container>
+XML);
+
+$container = $doc->documentElement;
+$child = $container->firstElementChild;
+
+$test = $doc->createElement('foo');
+foreach (['before', 'after', 'replaceWith'] as $method) {
+    echo "--- $method ---\n";
+    $test->$method($child);
+    echo $doc->saveXML();
+    echo $doc->saveXML($test), "\n";
+}
+?>
+--EXPECT--
+--- before ---
+<?xml version="1.0"?>
+<container>
+    <child/>
+</container>
+<foo/>
+--- after ---
+<?xml version="1.0"?>
+<container>
+    <child/>
+</container>
+<foo/>
+--- replaceWith ---
+<?xml version="1.0"?>
+<container>
+    <child/>
+</container>
+<foo/>

ext/dom/tests/bug79968.phpt

@@ -7,11 +7,14 @@ dom
 
 $cdata = new DOMText;
 
-try {
-    $cdata->before("string");
-} catch (DOMException $e) {
-    echo $e->getMessage();
-}
+$cdata->before("string");
+$cdata->after("string");
+$cdata->replaceWith("string");
+
+$dom = new DOMDocument();
+$dom->adoptNode($cdata);
+var_dump($dom->saveXML($cdata));
+
 ?>
 --EXPECT--
-Hierarchy Request Error
+string(0) ""

ext/dom/tests/element_child_and_parent_node_without_document.phpt

@@ -0,0 +1,21 @@
+--TEST--
+DOMElement: DOMChildNode, DOMParentNode modifications without a document
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+$element = new DOMElement("p", " Hello World! ");
+$element->append("APPENDED");
+$element->prepend("PREPENDED");
+$element->after("AFTER");
+$element->before("BEFORE");
+$element->replaceWith("REPLACE");
+
+$doc = new DOMDocument();
+$doc->adoptNode($element);
+echo $doc->saveXML($element), "\n";
+
+?>
+--EXPECT--
+<p>PREPENDED Hello World! APPENDED</p>