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Fix GH-21548: Dom\XMLDocument::C14N() emits duplicate xmlns declarati… #21565

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Fix GH-21548: Dom\XMLDocument::C14N() emits duplicate xmlns declarati… #21565

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2 changes: 1 addition & 1 deletion ext/dom/node.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2132,7 +2132,7 @@ static void dom_relink_ns_decls_element(HashTable *links, xmlNodePtr node)

ns->_private = attr;
if (attr->prev) {
attr->prev = attr->next;
attr->prev->next = attr->next;
} else {
node->properties = attr->next;
}
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17 changes: 17 additions & 0 deletions ext/dom/tests/modern/xml/gh21548.phpt
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@@ -0,0 +1,17 @@
--TEST--
GH-21548 (Dom\XMLDocument::C14N() emits duplicate xmlns declarations after setAttributeNS())
--CREDITS--
Toon Verwerft (veewee)
--EXTENSIONS--
dom
--FILE--
<?php

$doc = Dom\XMLDocument::createFromString('<root xmlns="urn:a" attr="val"/>');
$doc->documentElement->setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:ns1", "urn:a");

echo $doc->C14N() . PHP_EOL;

?>
--EXPECT--
<root xmlns="urn:a" xmlns:ns1="urn:a" attr="val"></root>
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