Wordpress自动将包含长链接的评论标记为垃圾评论

// 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?热? ". $spamcom. "n -- 记录成功 --";
    }
  }
  function sink( $comment ) {
    if ( !empty($_POST['spam_confirmed']) ) {
      if ( in_array( $comment['comment_type'], array('pingback', 'trackback') ) ) return $comment;
      //方法一: 直接挡掉, ? die(); 前面两斜线?h除即可.
      die();
      //方法二: 标记为 spam, 留在资料库检查是否误判.
      //add_filter('pre_comment_approved', create_function('', 'return "spam";'));
      //$comment['comment_content'] = "[ 小墙判断这是 Spam! ]n". $_POST['spam_confirmed'];
    }
    return $comment;
   }
 }
 $anti_spam = new anti_spam();

function in_comment_post_like($string, $array) {  
    foreach($array as $ref) { if(strstr($string, $ref)) { return true; } }  
    return false; 
} 
function drop_bad_comments() { 
    if (!empty($_POST['comment'])) { 
        $post_comment_content = $_POST['comment']; 
        $lower_case_comment = strtolower($_POST['comment']); 
        $bad_comment_content = array( 
            'viagra',  
            'hydrocodone', 
            'hair loss', 
            'xanax', 
            'tramadol', 
            'russian girls', 
            'russian brides', 
            'lorazepam', 
            'adderall', 
            'dexadrine', 
            'no prescription', 
            'oxycontin', 
            'without a prescription', 
            'sex pics', 
            'family incest', 
            'online casinos', 
            'online dating', 
            'cialis', 
            'best forex', 
            'amoxicillin' 
        ); 
        if (in_comment_post_like($lower_case_comment, $bad_comment_content)) { 
            $comment_box_text = wordwrap(trim($post_comment_content), 80, "n  ", true); 
            $txtdrop = fopen('/var/log/httpd/wp_post-logger/nullamatix.com-text-area_dropped.txt', 'a'); 
            fwrite($txtdrop, "  --------------n  [COMMENT] = " . $post_comment_content . "n  --------------n"); 
            fwrite($txtdrop, "  [SOURCE_IP] = " . $_SERVER['REMOTE_ADDR'] . " @ " . date("F j, Y, g:i a") . "n"); 
            fwrite($txtdrop, "  [USERAGENT] = " . $_SERVER['HTTP_USER_AGENT'] . "n"); 
            fwrite($txtdrop, "  [REFERER  ] = " . $_SERVER['HTTP_REFERER'] . "n"); 
            fwrite($txtdrop, "  [FILE_NAME] = " . $_SERVER['SCRIPT_NAME'] . " - [REQ_URI] = " . $_SERVER['REQUEST_URI'] . "n"); 
            fwrite($txtdrop, '--------------**********------------------'."n"); 
            header("HTTP/1.1 406 Not Acceptable"); 
            header("Status: 406 Not Acceptable"); 
            header("Connection: Close"); 
            wp_die( __('bang bang.') ); 
        } 
    } 
} 
add_action('init', 'drop_bad_comments');

function rkv_url_spamcheck( $approved , $commentdata ) {
    return ( strlen( $commentdata['comment_author_url'] ) > 50 ) ? 'spam' : $approved;
  }
 
  add_filter( 'pre_comment_approved', 'rkv_url_spamcheck', 99, 2 );