Online PHP editor | output for FvCAs

<?php $xml = '<?xml version="1.0" encoding="UTF-8"?> <root>Тест кириллицы</root> '; $original = new DOMDocument; $original->loadXML($xml); echo $original->saveXML(); echo PHP_EOL . PHP_EOL; // this is code from \SebastianBergmann\Comparator\DOMNodeComparator::nodeToText $document = new DOMDocument; @$document->loadXML($original->C14N()); echo $document->saveXML(); echo PHP_EOL . PHP_EOL; // if I add utf-8 xml header then document is good $document = new DOMDocument; @$document->loadXML('<?xml version="1.0" encoding="UTF-8"?>' . PHP_EOL . $original->C14N()); echo $document->saveXML();