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

<?php
function convert($string) {
  $doc = new DOMDocument();
  $doc->loadHTML($string);

  $as = $doc->getElementsByTagName('a');
  for ($i = $as->length - 1; $i >= 0; $i--) {
    $a = $as->item($i);
    $div = $doc->createElement('div');
    $div->setAttribute('onclick', 'location.href=' . $a->getAttribute('href'));
    $a->parentNode->replaceChild($div, $a);
  }

  return $doc->saveHTML();
}
?>

convert('<a href="https://github.com/mukmuk"></a>');