comment::spam PHP Method

    public static function spam($comment)
    {
        $parts = explode('@', $comment['email']);
        $domain = array_pop($parts);
        // check domain
        $query = static::where('email', 'like', '%' . $domain)->where('status', '=', 'spam');
        if ($query->count()) {
            // duplicate spam
            return true;
        }
        // check keywords
        $badwords = Config::get('meta.comment_moderation_keys');
        if ($badwords) {
            $words = explode(',', $badwords);
            foreach ($words as $word) {
                $word = preg_quote($word, '#');
                $pattern = "#{$word}#i";
                foreach ($comment as $part) {
                    if (preg_match($pattern, $part)) {
                        return true;
                    }
                }
            }
        }
        return false;
    }