External Link | Anchor | Internal Link'; // start $doc = new DOMDocument(); $doc->preserveWhiteSpace = false; $doc->loadHTML($output); $links = $doc->getElementsByTagName('a'); foreach ($links as $item) { $href = parse_url($item->getAttribute('href'), PHP_URL_HOST); if (!empty($href) && $href != $_SERVER['HTTP_HOST']){ $item->setAttribute('target','_blank'); } } $output = $doc->saveHTML(); echo($output);