I would like to know how I can set all external links in all posts from a certain wordpress user in my blog automatically to "nofollow" ? So that old postings and future postings from this user are affected by this "nofollow" command. How is that possible?

Thank you so much!

1 Answer 1


You want to try something like this (untested):

// Nofollow in content
$author_id = get_the_author_meta( 'ID' );
add_filter('the_content', 'my_nofollow');

function my_nofollow($content) {
    //return stripslashes(wp_rel_nofollow($content));

    return preg_replace_callback('/<a[^>]+/', 'my_nofollow_callback', $content);

function my_nofollow_callback($matches, $author_id) {
    $link = $matches[0];
    $site_link = get_bloginfo('url');
    if ($author_id === 4) {
        if (strpos($link, 'rel') === false) {
            $link = preg_replace("%(href=\S(?!$site_link))%i", 'rel="nofollow" $1', $link);
        } elseif (preg_match("%href=\S(?!$site_link)%i", $link) && (strpos($link, 'rel') === false)) {
            $link = preg_replace('/rel=\S(?!nofollow)\S*/i', 'rel="nofollow"', $link);
return $link;

Note: This is based on a nofollow function I am using on one of my sites and I just added a conditional for if ( is_author () ) in there

  • Wow, nice! You have to know that I am a coding noob. So please can you tell me where I have to add this code? I guess in the function file? And: where you wrote the '4' I have to write the authors name right? THX a bunch :) Commented Feb 16, 2020 at 9:43
  • Yes, you write the Author name in there or the Author ID. It goes in functions.php anywhere eg at the bottom. If there are any errors let me know.
    – TomC
    Commented Feb 16, 2020 at 10:18
  • Unfortunately it does not work. I tried the author id and the name but there is no nofollow in the authors postings. if (is_author('4')) { AND if (is_author('AUTHORNAME')) { does not work Commented Feb 16, 2020 at 14:24
  • I've modified my answer. Where I've used 4 as the author, you need to change this to the actual ID of your author. The old version used is_author which is deprecated and also I shouldn't have put it inside apostrophes.
    – TomC
    Commented Feb 16, 2020 at 18:53

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