- version_compare: documentation ( source)
- html_entity_decode: documentation ( source)
<?php
version_compare(PHP_VERSION, '7.1', '<') && die;
$xml = "<div><p>Мама мыла раму.</p></div>";
$dom = new DOMDocument;
$dom->loadXML($xml);
$html = $dom->saveHTML();
echo html_entity_decode($html);