How to chain like element with php domdocument?

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$dom = new DOMDocument();

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$root = $dom->createElement('root');

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$child1 = $dom->createElement('child1');
$root->appendChild($child1);

$child2 = $dom->createElement('child2');
$root->appendChild($child2);

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$child1->setAttribute('attr1', 'value1')
       ->setAttribute('attr2', 'value2')
       ->appendChild($dom->createTextNode('Text for child1'));

$child2->setAttribute('attr3', 'value3')
       ->setAttribute('attr4', 'value4')
       ->appendChild($dom->createTextNode('Text for child2'));

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$dom->appendChild($root);

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$dom->save('output.xml'); // Save to file

// Output as string
echo $dom->saveXML();