How to remove commenters ability to add hyperlinks to comments?

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I’d like to be able to filter out a commenters ability to add hyperlinks in their comment text.

I removed the “websites” field from the mix to reduce the amount of spammage already (see: Removing the “Website” Field from Comments and Replies?”) which has helped a lot.

By default, they can use the ‘< a ‘> tag to do so in the comment box text, which allows spammers to embed hyperlinks to their sites.

Is there a way to filter out that capability in the wysiwyg editor for comment fields?

2 Answers
2

WP runs so many prettifying filters on this stuff that it’s easy to get lost.

Here is what I ended up with:

remove_filter('comment_text', 'make_clickable', 9);
add_filter('pre_comment_content', 'strip_comment_links');

function strip_comment_links($content) {

    global $allowedtags;

    $tags = $allowedtags;
    unset($tags['a']);
    $content = addslashes(wp_kses(stripslashes($content), $tags));

    return $content;
}

This scrubs out clearly defined links and removes filter that turns plain text links into properly tagged ones.

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