屏蔽wordpress垃圾评论的方法（插件和非插件）

// 单独使用禁止全英文评论代码
function scp_comment_post( $incoming_comment ) {
	$pattern = '/[一-龥]/u';   //验证是否为中文 
	
	if(!preg_match($pattern, $incoming_comment['comment_content'])) {
	wp_die( "You should type some Chinese word (like \"你好\") in your comment to pass the spam-check, thanks for your patience! 您的评论中必须包含中文!" );
	}
	return( $incoming_comment );
}
add_filter('preprocess_comment', 'scp_comment_post');

//综合使用< <小牆>> Anti-Spam v1.84 by Willin Kan. 
class anti_spam {
  function anti_spam() {
    if ( !current_user_can('read') ) {
      add_action('template_redirect', array($this, 'w_tb'), 1);
      add_action('init', array($this, 'gate'), 1);
      add_action('preprocess_comment', array($this, 'sink'), 1);
    }
  }
  // 設欄位
  function w_tb() {
    if ( is_singular() ) {
      // 非中文語系
      if ( stripos($_SERVER['HTTP_ACCEPT_LANGUAGE'], 'zh') === false ) {
        add_filter( 'comments_open', create_function('', "return false;") ); // 關閉評論
      } else {
        ob_start(create_function('$input','return preg_replace("#textarea(.*?)name=([\"\'])comment([\"\'])(.+)/textarea&gt;#",
        "textarea$1name=$2w$3$4/textarea&gt;&lt;textarea name=\"comment\" cols=\"100%\" rows=\"4\" style=\"display:none\"&gt;/textarea&gt;",$input);') );
      }
    }
  }
  // 檢查
  function gate() {
    $w = 'w';
    if ( !empty($_POST[$w]) && empty($_POST['comment']) ) {
      $_POST['comment'] = $_POST[$w];
    } else {
$request = $_SERVER['REQUEST_URI'];
      $referer = isset($_SERVER['HTTP_REFERER'])         ? $_SERVER['HTTP_REFERER']         : '隱瞞';
      $IP      = isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] . ' (透過代理)' : $_SERVER["REMOTE_ADDR"];
	  $way     = isset($_POST[$w]) ? '手動操作' : '未經評論表格';
      $spamcom = isset($_POST['comment']) ? $_POST['comment'] : '';
      $_POST['spam_confirmed'] = "請求: ". $request. "\n來路: ". $referer. "\nIP: ". $IP. "\n方式: ". $way. "\n內容: ". $spamcom. "\n -- 記錄成功 --";
    }
  }
  // 處理
  function sink( $comment ) {
    // 不管 Trackbacks/Pingbacks
    if ( in_array( $comment['comment_type'], array('pingback', 'trackback') ) ) return $comment;
    // 已確定為 spam
    if ( !empty($_POST['spam_confirmed']) ) {
      // 方法一: 直接擋掉, 將 die(); 前面兩斜線刪除即可.
      //die();
      // 方法二: 標記為 spam, 留在資料庫檢查是否誤判.
      add_filter('pre_comment_approved', create_function('', 'return "spam";'));
      $comment['comment_content'] = "[ 小牆判斷這是Spam! ]\n". $_POST['spam_confirmed'];
      $this-&gt;add_black( $comment );
    } else {
      // 檢查頭像
      $f = md5( strtolower($comment['comment_author_email']) );
      $g = sprintf( "http://%d.gravatar.com", (hexdec($f{0}) % 2) ) .'/avatar/'. $f .'?d=404';
      $headers = @get_headers( $g );
      if ( !preg_match("|200|", $headers[0]) ) {
        // 沒頭像的列入待審(即当第一次留言时，需要审核)
        add_filter('pre_comment_approved', create_function('', 'return "0";'));
        //$this-&gt;add_black( $comment );
        }
    }
    return $comment;
  }
  // 列入黑名單
  function add_black( $comment ) {
    if (!($comment_author_url = $comment['comment_author_url'])) return;
    if ($pos = strpos($comment_author_url, '//')) $comment_author_url = substr($comment_author_url, $pos + 2);
    if ($pos = strpos($comment_author_url, '/'))  $comment_author_url = substr($comment_author_url, 0, $pos);
    $comment_author_url = strtr($comment_author_url, array('www.' =&gt; ''));
    if (!wp_blacklist_check('', '', $comment_author_url, '', '', '')) update_option('blacklist_keys', $comment_author_url . "\n" . get_option('blacklist_keys'));
  }
}
$anti_spam = new anti_spam();