WordPress垃圾评论拦截代码

垃圾评论很讨厌，我也经常去留言垃圾评论，哇嘎嘎……
模板函数 (functions.php)新增

// 垃圾评论拦截
class anti_spam {
	function anti_spam() {
	    if ( !current_user_can('level_0') ) {
	      add_action('template_redirect', array($this, 'w_tb'), 1);
	      add_action('init', array($this, 'gate'), 1);
	      add_action('preprocess_comment', array($this, 'sink'), 1);
		}
	  }
	function w_tb() {
    if ( is_singular() ) {
      ob_start(create_function('$input','return preg_replace("#textarea(.*?)name=([\"\'])comment([\"\'])(.+)/textarea>#",
      "textarea$1name=$2w$3$4/textarea>",$input);') );
    }
  }
  function gate() {
    if ( !empty($_POST['w']) && empty($_POST['comment']) ) {
      $_POST['comment'] = $_POST['w'];
    } else {
      $request = $_SERVER['REQUEST_URI'];
      $referer = isset($_SERVER['HTTP_REFERER'])         ? $_SERVER['HTTP_REFERER']         : '隐瞒';
      $IP      = isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] . ' (透过代理)' : $_SERVER["REMOTE_ADDR"];
      $way     = isset($_POST['w'])                      ? '手动操作'                       : '未经评论表格';
      $spamcom = isset($_POST['comment'])                ? $_POST['comment']                : null;
      $_POST['spam_confirmed'] = "请求: ". $request. "\n来路: ". $referer. "\nIP: ". $IP. "\n方式: ". $way. "\n內容: ". $spamcom. "\n -- 记录成功 --";
    }
  }
  function sink( $comment ) {
    if ( !empty($_POST['spam_confirmed']) ) {
      if ( in_array( $comment['comment_type'], array('pingback', 'trackback') ) ) return $comment;
      //方法一: 直接挡掉, 將 die(); 前面两斜线刪除即可.
      die();
      //方法二: 标记为 spam, 留在资料库检查是否误判, 以下两行.
      //add_filter('pre_comment_approved', create_function('', 'return "spam";'));
      //$comment['comment_content'] = "[ 小墙判断这是 Spam! ]\n". $_POST['spam_confirmed'];
    }
    return $comment;
	  }
	}
	$anti_spam = new anti_spam();