Title: Math Captcha for Gravity Forms
Author: codedbyabir
Published: <strong>2026 年 7 月 1 日</strong>
Last modified: 2026 年 7 月 1 日

---

搜尋外掛

![](https://ps.w.org/math-captcha-for-gravity-forms/assets/banner-772x250.jpg?rev
=3593139)

![](https://ps.w.org/math-captcha-for-gravity-forms/assets/icon-128x128.png?rev=
3593139)

# Math Captcha for Gravity Forms

 由 [codedbyabir](https://profiles.wordpress.org/codedbyabir/) 開發

[下載](https://downloads.wordpress.org/plugin/math-captcha-for-gravity-forms.1.0.0.zip)

 * [詳細資料](https://tw.wordpress.org/plugins/math-captcha-for-gravity-forms/#description)
 * [使用者評論](https://tw.wordpress.org/plugins/math-captcha-for-gravity-forms/#reviews)
 *  [安裝方式](https://tw.wordpress.org/plugins/math-captcha-for-gravity-forms/#installation)
 * [開發資訊](https://tw.wordpress.org/plugins/math-captcha-for-gravity-forms/#developers)

 [技術支援](https://wordpress.org/support/plugin/math-captcha-for-gravity-forms/)

## 外掛說明

Math Captcha for Gravity Forms adds a basic “what is X + Y” challenge to any Gravity
Forms form, helping block automated spam submissions without relying on third-party
CAPTCHA services, external API calls, or client-side JavaScript.

**How it works**

 1. Add three fields to your Gravity Forms form:
 2.  * A **Number** (or Hidden) field with Admin Label `num1`
     * A **Number** (or Hidden) field with Admin Label `num2`
     * A **Number** field with Admin Label `math_answer`, where the visitor types their
       answer
 3. Add an **HTML** field containing the placeholder `{math_question}` wherever you
    want the question text to appear.
 4. The plugin fills `num1` and `num2` with random numbers on each page load, replaces`{
    math_question}` with the rendered question, and validates `math_answer` server-
    side on submit.

The same numbers persist across a failed-validation reload, so the question a visitor
sees always matches what’s being validated.

**Why server-side?**

No JavaScript means no scripts to block, no client-side bypass, and no impact on
page-load performance.

This plugin is independently developed and is not affiliated with, endorsed by, 
or sponsored by Rocketgenius, Inc. or Gravity Forms.

## 螢幕擷圖

[[

[[

## 安裝方式

 1. Upload the `math-captcha-for-gravity-forms` folder to `/wp-content/plugins/`, or
    install directly through the WordPress plugin screen.
 2. Activate the plugin through the ‘Plugins’ screen in WordPress.
 3. Make sure Gravity Forms is installed and active — this plugin does nothing without
    it.
 4. Edit the form(s) you want to protect and add the three fields described above (
    Admin Labels `num1`, `num2`, `math_answer`) plus an HTML field containing `{math_question}`.

## 常見問題集

### Does this work without Gravity Forms?

No. This plugin only adds functionality on top of Gravity Forms and does nothing
if Gravity Forms is not installed and active. You’ll see an admin notice if it’s
missing.

### Does this send any data to external services?

No. All number generation and validation happens entirely server-side, on your own
site.

### Can I style the question text?

Yes — the question is wrapped in a `<strong>` tag inside your HTML field, so you
can wrap it with your own markup/CSS in the HTML field content.

### What happens if I don’t add the math_answer field?

The plugin checks for all three fields (`num1`, `num2`, `math_answer`) by Admin 
Label. If any are missing from a given form, validation is skipped silently for 
that form, so it won’t break forms that aren’t using the captcha.

## 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〈Math Captcha for Gravity Forms〉的開發相關工作。

參與者

 *   [ codedbyabir ](https://profiles.wordpress.org/codedbyabir/)

[將〈Math Captcha for Gravity Forms〉外掛本地化為台灣繁體中文版](https://translate.wordpress.org/projects/wp-plugins/math-captcha-for-gravity-forms)

### 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/math-captcha-for-gravity-forms/)、
查看 [SVN 存放庫](https://plugins.svn.wordpress.org/math-captcha-for-gravity-forms/)，
或透過 [RSS](https://plugins.trac.wordpress.org/log/math-captcha-for-gravity-forms/?limit=100&mode=stop_on_copy&format=rss)
訂閱[開發記錄](https://plugins.trac.wordpress.org/log/math-captcha-for-gravity-forms/)。

## 變更記錄

#### 1.0.0

 * Initial release.

## 中繼資料

 *  版本 **1.0.0**
 *  最後更新 **2 個月前**
 *  啟用安裝數 **10+**
 *  WordPress 版本需求 ** 6.3 或更新版本 **
 *  已測試相容的 WordPress 版本 **7.0.4**
 *  PHP 版本需求 ** 7.4 或更新版本 **
 *  語言
 * [English (US)](https://wordpress.org/plugins/math-captcha-for-gravity-forms/)
 * 標籤:
 * [captcha](https://tw.wordpress.org/plugins/tags/captcha/)[forms](https://tw.wordpress.org/plugins/tags/forms/)
   [gravity forms](https://tw.wordpress.org/plugins/tags/gravity-forms/)[math captcha](https://tw.wordpress.org/plugins/tags/math-captcha/)
   [spam protection](https://tw.wordpress.org/plugins/tags/spam-protection/)
 *  [進階檢視](https://tw.wordpress.org/plugins/math-captcha-for-gravity-forms/advanced/)

## 評分

這個項目尚無任何評論記錄。

[撰寫評分](https://wordpress.org/support/plugin/math-captcha-for-gravity-forms/reviews/#new-post)

[查看全部使用者評論](https://wordpress.org/support/plugin/math-captcha-for-gravity-forms/reviews/)

## 參與者

 *   [ codedbyabir ](https://profiles.wordpress.org/codedbyabir/)

## 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/math-captcha-for-gravity-forms/)