<?php
$html = '<div class="content"><div>Content</div></div>';
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
$divs = $xpath->query('//div[@class="content"]');
foreach($divs as $div) {
foreach ($div->childNodes as $childNode) {
echo $dom->saveHTML($childNode);
}
}
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