PHP remove links to specific website but keep text

Question

For example, remove links to here but keep text but leave all other

Answer 1

$html = '...I can haz HTML?...';
$whitelist = array('herpyderp.com', 'google.com');

$dom = new DomDocument();
$dom->loadHtml($html);    
$links = $dom->getELementsByTagName('a');

foreach($links as $link){
  $host = parse_url($link->getAttribute('href'), PHP_URL_HOST);

  if($host && !in_array($host, $whitelist)){    

    // create a text node with the contents of the blacklisted link
    $text = new DomText($link->nodeValue);

    // insert it before the link
    $link->parentNode->insertBefore($text, $link);

    // and remove the link
    $link->parentNode->removeChild($link);
  }  

}

// remove wrapping tags added by the parser
$dom->removeChild($dom->firstChild);            
$dom->replaceChild($dom->firstChild->firstChild->firstChild, $dom->firstChild);

$html = $dom->saveHtml();

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For those scared to use DomDocument instead of preg_replace for performance reasons, I did a quick test between this and the code linked in the Q (the one that completely removes the links) => DomDocument is only ~4 times slower.