add options to limit comment_content

function ps_limit_comment_length($comment) {

    $max_length = 280;

    if (strlen($comment[‘comment_content’]) > $max_length) {

        wp_die(‘<strong>Warning:</strong> Please keep your comment under ‘ . $max_length . ‘ characters.’, ‘Comment Length Warning’, array(‘response’ => 500, ‘back_link’ => true));

    }

    return $comment;

}

add_filter(‘preprocess_comment’, ‘ps_limit_comment_length’);