Title: FeedWordPress Duplicate Post Filter
Author: Mark Allen
Published: <strong>2008 年 4 月 13 日</strong>
Last modified: 2012 年 3 月 2 日

---

搜尋外掛

這個外掛**並未在最新的 3 個 WordPress 主要版本上進行測試**。開發者可能不再對這個
外掛進行維護或提供技術支援，並可能會與更新版本的 WordPress 產生使用上的相容性問題。

![](https://s.w.org/plugins/geopattern-icon/feedwordpress-duplicate-post-filter.
svg)

# FeedWordPress Duplicate Post Filter

 由 [Mark Allen](https://profiles.wordpress.org/mrallen1/) 開發

[下載](https://downloads.wordpress.org/plugin/feedwordpress-duplicate-post-filter.1.5.zip)

 * [詳細資料](https://tw.wordpress.org/plugins/feedwordpress-duplicate-post-filter/#description)
 * [使用者評論](https://tw.wordpress.org/plugins/feedwordpress-duplicate-post-filter/#reviews)
 *  [安裝方式](https://tw.wordpress.org/plugins/feedwordpress-duplicate-post-filter/#installation)
 * [開發資訊](https://tw.wordpress.org/plugins/feedwordpress-duplicate-post-filter/#developers)

 [技術支援](https://wordpress.org/support/plugin/feedwordpress-duplicate-post-filter/)

## 外掛說明

This is a filter for the FeedWordPress plugin. **If you don’t use FeedWordPress 
this plugin will not be useful to you.**

I wrote this filter after seeing the same post in my database 32 times. Maybe you’ve
had the same problem, and I hope this filter helps you solve it.

The filter works by hooking the “syndicated_post” action of FeedWordPress and the“
save_post” action in the core of WordPress.

For each potential post from a feed, the plugin attempts to find an identical SHA1
hash of the first 1024 non-whitespace characters (stripped of HTML tags) of the 
post content.
 If it finds a match the post is skipped. If not, the post is processed
and a hash is inserted into the post’s metadata. (Stored as key _dpf.)

**NOTE:** No filter is going to be 100% accurate. This filter will stop _most_ or
_some_ duplicates, but in all likelihood, will not stop _all_ of them.
 If you want
a filter that stops _all_ duplicates, this isn’t your solution. In my test installation
I had 5 posted duplicates out of 125 syndicated posts (4% false negative) out of
a corpus of about 300 duplicates. Most of those false negatives were due to slightly
different HTML markup in the post content itself. So my approach isn’t perfect, 
but it is “good enough” for me.

### Important Note

This filter can only check future syndication posts. Whatever duplicates are already
present in your WordPress installation you’ll have to remove/clean-up on your own.

### License

Copyright (C) 2012 by Mark R. Allen
 All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this list
   of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this
   list of conditions and the following disclaimer in the documentation and/or other
   materials provided with the distribution.
 * Neither the name of Mark Allen nor the names of any contributors may be used 
   to endorse or promote products derived from this software without specific prior
   written permission.

## 安裝方式

 1. Download the plugin and uncompress it.
 2. Plop it in the same directory as feedwordpress.php
 3. Enable this filter in WordPress by visiting the “Plugin” menu and activating it.

## 使用者評論

這個外掛目前沒有任何使用者評論。

## 參與者及開發者

以下人員參與了開源軟體〈FeedWordPress Duplicate Post Filter〉的開發相關工作。

參與者

 *   [ Mark Allen ](https://profiles.wordpress.org/mrallen1/)

[將〈FeedWordPress Duplicate Post Filter〉外掛本地化為台灣繁體中文版](https://translate.wordpress.org/projects/wp-plugins/feedwordpress-duplicate-post-filter)

### 對開發相關資訊感興趣？

任何人均可[瀏覽程式碼](https://plugins.trac.wordpress.org/browser/feedwordpress-duplicate-post-filter/)、
查看 [SVN 存放庫](https://plugins.svn.wordpress.org/feedwordpress-duplicate-post-filter/)，
或透過 [RSS](https://plugins.trac.wordpress.org/log/feedwordpress-duplicate-post-filter/?limit=100&mode=stop_on_copy&format=rss)
訂閱[開發記錄](https://plugins.trac.wordpress.org/log/feedwordpress-duplicate-post-filter/)。

## 變更記錄

1.5 – Remove HTML tags before computing hash.

1.4 – Overhauled strategy for duplicate detection. This works better than previous
strategies.

1.3 – Fixed a dumb typo. Rewrote the DB query using better wpdb methods (prepare
and query). Changed from htmlescape2 to esc_html WP function.

1.2 – Escaping the single quote (‘) character sometimes gives a conversion of ’ 
instead of ’ This caused a false negative and duplicate posts would be stored. Consider
this release a temporary hack until I write a proper regex based title escape function.

1.1 – Characters in post-titles like ‘&’ were not getting converted to HTML entities.
This caused the post title comparison to register a false negative. (So duplicate
posts would be added to your feed.)

1.0 – initial release

## 中繼資料

 *  版本 **1.5**
 *  最後更新 **14 年前**
 *  啟用安裝數 **200+**
 *  WordPress 版本需求 ** 2.8 或更新版本 **
 *  已測試相容的 WordPress 版本 **3.3.2**
 *  語言
 * [English (US)](https://wordpress.org/plugins/feedwordpress-duplicate-post-filter/)
 * 標籤
 * [duplicate posts](https://tw.wordpress.org/plugins/tags/duplicate-posts/)[feedwordpress](https://tw.wordpress.org/plugins/tags/feedwordpress/)
 *  [進階檢視](https://tw.wordpress.org/plugins/feedwordpress-duplicate-post-filter/advanced/)

## 評分

這個項目尚無任何評論記錄。

[Your review](https://wordpress.org/support/plugin/feedwordpress-duplicate-post-filter/reviews/#new-post)

[查看全部使用者評論](https://wordpress.org/support/plugin/feedwordpress-duplicate-post-filter/reviews/)

## 參與者

 *   [ Mark Allen ](https://profiles.wordpress.org/mrallen1/)

## 技術支援

使用者可在技術支援論壇提出意見反應或使用問題。

 [檢視技術支援論壇](https://wordpress.org/support/plugin/feedwordpress-duplicate-post-filter/)