get string, convert <a> tags to <div> with onclick on the href attribute

function changeATags($html) {
  $dom = new DOMDocument;
  $dom->loadHTML($html);
  $as = $dom->getElementsByTagName('a');
  foreach ($as as $a) {
    $div = $dom->createElement('div', $a->nodeValue);
    $div->setAttribute('onclick', $a->getAttribute('href'));
    $a->parentNode->replaceChild($div, $a);
  }
  return $dom->saveHTML();
}