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<?php $html = 'HTML String <h3>whatever</h3>'; $dom = new DOMDocument; $dom->loadHTML($html); $xpath = new DOMXPath($dom); foreach ($xpath->query('//h3') as $h3) { $h3->firstChild->nodeValue = ucfirst($h3->firstChild->nodeValue); } echo $dom->saveHTML();
Output for git.master, git.master_jit, rfc.property-hooks
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><body><p>HTML String </p><h3>Whatever</h3></body></html>

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