Disable HTML in Comments

 In Wordpress Admin

Spam can be a real pain. Do you get spam in the comments of your site that are littered with links to even more spam?

Disable HTML in your comments to prevent links to spam, bold text and other spammy tactics. Just add the following code to your functions.php file:

// This will occur when the comment is posted
function plc_comment_post( $incoming_comment ) {
    // convert everything in a comment to display literally
    $incoming_comment['comment_content'] = htmlspecialchars($incoming_comment['comment_content']);
    // the one exception is single quotes, which cannot be #039; because WordPress marks it as spam
    $incoming_comment['comment_content'] = str_replace( "'", ''', $incoming_comment['comment_content'] );
    return( $incoming_comment );
// This will occur before a comment is displayed
function plc_comment_display( $comment_to_display ) {
    // Put the single quotes back in
    $comment_to_display = str_replace( ''', "'", $comment_to_display );
    return $comment_to_display;
add_filter( 'preprocess_comment', 'plc_comment_post', '', 1 );
add_filter( 'comment_text', 'plc_comment_display', '', 1 );
add_filter( 'comment_text_rss', 'plc_comment_display', '', 1 );
add_filter( 'comment_excerpt', 'plc_comment_display', '', 1 );
// This stops WordPress from trying to automatically make hyperlinks on text:
remove_filter( 'comment_text', 'make_clickable', 9 );
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