Nofollow external links

Question

Nofollow external links

SillyNinja

2018年4月21日 08:04

Hello guys i am using following code to make all external links nofollow.

add_filter('the_content', 'my_nofollow');
add_filter('the_excerpt', 'my_nofollow');

function my_nofollow($content) {
return preg_replace_callback('/a[^]+/', 'my_nofollow_callback', $content);
}
function my_nofollow_callback($matches) {
$link = $matches[0];
$site_link = get_bloginfo('url');

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)) {
    $link = preg_replace('/rel=\S(?!nofollow)\S*/i', 'rel="nofollow"', $link);
}
return $link;
}

But after adding this code in my site's Theme Functions all links are still dofollow.

I am using Advanced Custom Fields Pro plugin and links adding by using this plugin are still dofollow.

How to make all external links no follow?

Topic nofollow Wordpress

Category Web

Tung Du · Accepted Answer · 2016年4月25日 01:43

Edit 2: By suggest of @Mark Kaplun, the general solution should be this. We will do filtering after the page is generated, so we won't care about which plugin we're using.

We need a hack here to get whole page:

ob_start();

add_action('shutdown', function() {
    $final = '';

    // We'll need to get the number of ob levels we're in, so that we can iterate over each, collecting
    // that buffer's output into the final output.
    $levels = ob_get_level();

    for ($i = 0; $i < $levels; $i++)
    {
        $final .= ob_get_clean();
    }

    // Apply any filters to the final output
    echo apply_filters('final_output', $final);
}, 0);

I take this code from this question

Then you can remove 2 old filter:

add_filter('the_content', 'my_nofollow');
add_filter('the_excerpt', 'my_nofollow');

Use only one instead:

add_filter('final_output', 'my_nofollow');

Old answer

Just add one more filter.

add_filter('acf/load_value/name=my_field', 'my_nofollow' );

Edit: The concept to solve the problem here is filter the content that generated by plugin, for you here is ACF. Because the_content is from WP, not the plugin you're using, so add filter to the_content won't help.

Nofollow external links

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