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<?php

$root = new DOMDocument();
$root->loadXML('<article id=""><h1></h1><p></p></article>');

$node = new DOMDocument();
$node->loadXML('<section><h1></h1><p></p></section>');

$node = $root->importNode($node->documentElement, true);
$root->documentElement->appendChild($node);
print $root->saveXML();

eol versions

Output
Performance
VLD opcodes
References
Segmentation fault
RFC branches

Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0: <?xml version="1.0"?> <article id=""><h1/><p/><section><h1/><p/></section></article>