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<?php $data = '<user><prop name="A"><sub name="X"></sub></prop><prop name="B"><sub name="Y"></sub></prop></user>'; $xml = new DomDocument; $xml->loadXML($data); $xpath = new DomXpath($xml); $subY = $xpath->query('//sub[@name="Y"]')->firstChild; $design = $xml->createElement('design'); $design->setAttribute('name', 'J'); $design->setAttribute('path', 'folder'); $subY->appendChild($design); $xml->formatOutput = true; $xml->preserveWhiteSpace = false; echo $xml->saveXML();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined property: DOMNodeList::$firstChild in /in/nf9dD on line 9 Fatal error: Uncaught Error: Call to a member function appendChild() on null in /in/nf9dD:16 Stack trace: #0 {main} thrown in /in/nf9dD on line 16
Process exited with code 255.

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