Adding rel=”nofollow” to all links in WordPress posts

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I want to add a rel=”nofollow” to all the links in my wordpress posts and I want to be able to have a list of links that won’t get the nofollow.

I have been trying a lot, but I can’t get it done right, because I really can’t understand regex very well.

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So I have the string $text and I want to replace a href=”url”> with a href=”url” rel=”nofollow”> unless the href matches some specific domains.

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  1. Say you added a class to links you don’t want to be followed…

    $skipClass = 'preserve-rel';

$dom = new DOMDocument;

$dom->loadHTML($str);

$anchors = $dom->getElementsByTagName('a');

foreach($anchors as $anchor) { 
    $rel = array(); 

    if ($anchor->hasAttribute('class') AND preg_match('/b' . preg_quote($skipClass, '/') . 'b/', $anchor->getAttribute('class')) {
       continue;
    }

    if ($anchor->hasAttribute('rel') AND ($relAtt = $anchor->getAttribute('rel')) !== '') {
       $rel = preg_split('/s+/', trim($relAtt));
    }

    if (in_array('nofollow', $rel)) {
      continue;
    }

    $rel[] = 'nofollow';
    $anchor->setAttribute('rel', implode(' ', $rel));
}

var_dump($dom->saveHTML());

    This will add nofollow to all links except ones with a class defined above.