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<?php $doc = new DOMDocument; $doc->formatOutput = true; $node = $doc->createElement("root"); $ele = $doc->createElement("first-ele", 'ele1'); $node->appendChild($ele); $ele2 = $doc->createElement("sec-ele", 'ele2'); $node->appendChild($ele2); $doc->appendChild($node); $data_string = $doc->saveXML(); echo $data_string = $doc->saveXML(), PHP_EOL; $new_doc = new DOMDocument; $new_doc->loadXML($data_string); $new_doc->formatOutput = true; $root = $new_doc->getElementsByTagName('root')->item(0); $new_element = $new_doc->createElement('third-ele', 'third'); $root->appendChild($new_element); echo $new_doc->saveXML();
Output for git.master, git.master_jit, rfc.property-hooks
<?xml version="1.0"?> <root> <first-ele>ele1</first-ele> <sec-ele>ele2</sec-ele> </root> <?xml version="1.0"?> <root> <first-ele>ele1</first-ele> <sec-ele>ele2</sec-ele> <third-ele>third</third-ele></root>

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