wordpress评论增加算数验证码和敏感词中文代码版

首先添加到主题的functions.php文件内，效果见本站~~
评论算数验证码：

//评论算数
function spam_protection_math()
{
    $num1 = rand(1, 9);
    $num2 = rand(1, 9);
    echo "<span class='yanzheng'> {$num1} + {$num2} = <input type='text' style='width:60px;' name='sum' class='math_textfield' value=''>" . "<input type='hidden' name='num1' value='{$num1}'>" . "<input type='hidden' name='num2' value='{$num2}'>" . "</span>";
}
function spam_protection_pre($commentdata)
{
    $sum = $_POST['sum'];
    switch ($sum) {
        case $_POST['num1'] + $_POST['num2']:
            break;
        case null:
            err('请输入计算结果！');
            break;
        default:
            err('老铁数学不行啊！再算算！');
    }
    return $commentdata;
}
if ($comment_data['comment_type'] == '') {
    add_filter('preprocess_comment', 'spam_protection_pre');
}

敏感词和限制只能中文评论：

//评论敏感词和中文
    function uedsc_fuckspam($comment)
{
    if (is_super_admin()) {
        return $comment;
    }
    if (wp_blacklist_check($comment['comment_author'], $comment['comment_author_email'], $comment['comment_author_url'], $comment['comment_content'], $comment['comment_author_IP'], $comment['comment_agent'])) {
        header("Content-type: text/html; charset=utf-8");
        err('您的评论内容包含敏感词汇，请检查内容后再次提交！');
    } else {
        return $comment;
    }
}
add_filter('preprocess_comment', 'uedsc_fuckspam');
function refused_spam_comments($comment_data)
{
    $pattern = '/[一-龥]/u';
    if (!preg_match($pattern, $comment_data['comment_content'])) {
        err('评论内容必须含中文！');
    }
    return $comment_data;
}
add_filter('preprocess_comment', 'refused_spam_comments');

下面的代码用于输出调用，添加到评论文件的合适位置，一般添加在button、submit提交按钮之前。我的是在comments.php文件。