Title: Really Simple CAPTCHA Author: Rock Lobster Inc. Published: 10 Tháng 3, 2009 Last modified: 1 Tháng 2, 2025 --- Tìm kiếm plugin ![](https://ps.w.org/really-simple-captcha/assets/banner-772x250.png?rev=880406) Plugin này **chưa được cập nhật với 3 phiên bản mới nhất của WordPress**. Nó có thể không được hỗ trợ và bảo trì, và có thể xung đột với các phiên bản WordPress mới nhất. ![](https://ps.w.org/really-simple-captcha/assets/icon-256x256.png?rev=1047241) # Really Simple CAPTCHA Bởi [Rock Lobster Inc.](https://profiles.wordpress.org/rocklobsterinc/) [Tải về](https://downloads.wordpress.org/plugin/really-simple-captcha.2.4.zip) * [Chi tiết](https://vi.wordpress.org/plugins/really-simple-captcha/#description) * [Đánh giá](https://vi.wordpress.org/plugins/really-simple-captcha/#reviews) * [Cài đặt](https://vi.wordpress.org/plugins/really-simple-captcha/#installation) * [Nhà phát triển](https://vi.wordpress.org/plugins/really-simple-captcha/#developers) [Hỗ trợ](https://wordpress.org/support/plugin/really-simple-captcha/) ## Mô tả Really Simple CAPTCHA does not work alone and is intended to work with other plugins. It is originally created for [Contact Form 7](https://contactform7.com/), however, you can use it with your own plugin. Note: This product is “really simple” as its name suggests, i.e., it is not strongly secure. If you need perfect security, you should try other solutions. #### How does it work? Really Simple CAPTCHA does not use PHP “Sessions” for storing states, unlike many other PHP CAPTCHA solutions, but stores them as temporary files. This allows you to embed it into WordPress without worrying about conflicts. When you generate a CAPTCHA, Really Simple CAPTCHA creates two files for it; one is an image file of CAPTCHA, and the other is a text file which stores the correct answer to the CAPTCHA. The two files have the same (random) prefix in their file names, for example, “a7hk3ux8p. png” and “a7hk3ux8p.txt.” In this case, for example, when the respondent answers“ K5GF” as an answer to the “a7hk3ux8p.png” image, then Really Simple CAPTCHA calculates hash of “K5GF” and tests it against the hash stored in the “a7hk3ux8p.txt” file. If the two match, the answer is confirmed as correct. #### How to use with your plugin Note: Below are instructions for plugin developers. First, create an instance of ReallySimpleCaptcha class: ``` $captcha_instance = new ReallySimpleCaptcha(); ``` You can change the instance variables as you wish. ``` // Change the background color of CAPTCHA image to black $captcha_instance->bg = array( 0, 0, 0 ); ``` See really-simple-captcha.php if you are interested in other variables. Generate a random word for CAPTCHA. ``` $word = $captcha_instance->generate_random_word(); ``` Generate an image file and a corresponding text file in the temporary directory. ``` $prefix = wp_rand(); $captcha_instance->generate_image( $prefix, $word ); ``` Then, show the image and get an answer from respondent. Check the correctness of the answer. ``` $correct = $captcha_instance->check( $prefix, $the_answer_from_respondent ); ``` If the $correct is true, go ahead. Otherwise, block the respondent — as it would appear not to be human. And last, remove the temporary image and text files, as they are no longer in use. ``` $captcha_instance->remove( $prefix ); ``` That’s all. If you wish to see a live sample of this, you can try [Contact Form 7](https://contactform7.com/captcha/). ## Ảnh màn hình * [[ * screenshot-1.png ## Cài đặt In most cases you can install automatically from WordPress. However, if you install this manually, follow these steps: 1. Upload the entire `really-simple-captcha` folder to the `/wp-content/plugins/` directory. 2. Activate the plugin through the ‘Plugins’ menu in WordPress. FYI: There is no “control panel” for this plugin. ## Hỏi đáp ### CAPTCHA does not work; the image does not show up. Really Simple CAPTCHA needs GD and FreeType library installed on your server. Ask your server administrator if they are installed. Also, make the temporary file folder writable. The location of the temporary file folder is managed by the instance variable `tmp_dir` of ReallySimpleCaptcha class. Note that the setting varies depending on the calling plugin. For example, Contact Form 7 uses `wp-contents/uploads/wpcf7_captcha` as the temporary folder basically, but it can use different folder depending on your settings. If you have any further questions, please submit them [to the support forum](https://wordpress.org/support/plugin/really-simple-captcha). ## Đánh giá ![](https://secure.gravatar.com/avatar/e627f34d1ed130ebc94bb0ca9314b4bafc8ab7d021047522bd4b25d643f858a8? s=60&d=retro&r=g) ### 󠀁[Prima, funktioniert auch auf meiner WP 6.9 einwandfrei](https://wordpress.org/support/topic/prima-funktioniert-auch-auf-meiner-wp-6-9-einwandfrei/)󠁿 [afudo1tlg](https://profiles.wordpress.org/afudo1tlg/) 13 Tháng 1, 2026 Super simple! Einfach in Contact Form 7 Version 6.1.4 einzubinden. Danke. Meine WordPress Installation: Version 6.9.PHP Version 8.4.15 ![](https://secure.gravatar.com/avatar/102d46bc8cc18bdb8bb252de26388aafa9186150f904007befeaf514af4c1f52? s=60&d=retro&r=g) ### 󠀁[Bad](https://wordpress.org/support/topic/bad-353/)󠁿 [Diego Soto](https://profiles.wordpress.org/diego-soto/) 15 Tháng 9, 2025 1 trả lời I’m sorry to have to give this a bad rating. The amount of spam with Contact Form 7 was enormous. I had to remove it. ![](https://secure.gravatar.com/avatar/bed0303e15fbaf6ccf27290abc29160870a170e0eb5265e01a0c8c649c8574c7? s=60&d=retro&r=g) ### 󠀁[Works great with Gravity Forms in 2024!](https://wordpress.org/support/topic/works-great-with-gravity-forms-in-2024/)󠁿 [Maxcom](https://profiles.wordpress.org/maxcom/) 19 Tháng 8, 2024 Nothing but positives. We added this to our Gravity Form in order to obtain the dynamic math captcha. One can create a simple math captcha in GF but not dynamically changing for each form load insofar as I can determine. And GF google captcha Ver 3 is a pain with the need for google api keys. So we added this plugin and it was very easy – add the captcha field to the form, select “math” in the settings for the field and done! We find that Gravity Forms Zero Spam plugin was helping to deter spam entries but it with this captcha is 100% so far for spam prevention. Thank you Takayuki Miyoshi! ![](https://secure.gravatar.com/avatar/c910362dbfbd49f8ec8c185f618f4db62e2842297530d6f8bc8cf903d26da6c9? s=60&d=retro&r=g) ### 󠀁[Good Simple Banner](https://wordpress.org/support/topic/good-simple-banner/)󠁿 [nicolasvsedeco](https://profiles.wordpress.org/nicolasvsedeco/) 25 Tháng 10, 2023 Helo, very simple banner for cookies but there is a little bug. The banner Cookies are shown in Widgets page. ![](https://secure.gravatar.com/avatar/a9f956dcdf45addfd12c942879c61a6fa5c9c113e674409a0b825e47c0ae94ac? s=60&d=retro&r=g) ### 󠀁[Bad and not work to stabilite](https://wordpress.org/support/topic/bad-and-not-work-to-stabilite/)󠁿 [gurcantet](https://profiles.wordpress.org/gurcantet/) 11 Tháng 4, 2023 spam is continue to come… ![](https://secure.gravatar.com/avatar/ec51b32c53259c5d1abbbf367b2ca7b3f19775f179f869d413ca0f103cdd6515? s=60&d=retro&r=g) ### 󠀁[test](https://wordpress.org/support/topic/test-132/)󠁿 [rahzan](https://profiles.wordpress.org/rahzan/) 16 Tháng 9, 2022 we [ Đọc tất cả 129 đánh giá ](https://wordpress.org/support/plugin/really-simple-captcha/reviews/) ## Người đóng góp & Lập trình viên “Really Simple CAPTCHA” là mã nguồn mở. Những người sau đã đóng góp vào plugin này. Những người đóng góp * [ Rock Lobster Inc. ](https://profiles.wordpress.org/rocklobsterinc/) * [ Takayuki Miyoshi ](https://profiles.wordpress.org/takayukister/) “Really Simple CAPTCHA” đã được dịch qua 41 ngôn ngữ. Cảm ơn [những người tham gia dịch](https://translate.wordpress.org/projects/wp-plugins/really-simple-captcha/contributors) vì đóng góp của họ. [Dịch “Really Simple CAPTCHA” sang ngôn ngữ của bạn.](https://translate.wordpress.org/projects/wp-plugins/really-simple-captcha) ### Muốn tham gia phát triển? [Duyệt code](https://plugins.trac.wordpress.org/browser/really-simple-captcha/), check out [SVN repository](https://plugins.svn.wordpress.org/really-simple-captcha/), hoặc theo dõi [nhật ký phát triển](https://plugins.trac.wordpress.org/log/really-simple-captcha/) qua [RSS](https://plugins.trac.wordpress.org/log/really-simple-captcha/?limit=100&mode=stop_on_copy&format=rss). ## Nhật ký thay đổi #### 2.4 * Bumps up the minimum required WordPress version to 6.6. * Introduces the ReallySimpleCaptcha_Filesystem trait. * Uses SHA-256 as the hash algorithm. * Uses `wp_rand()` instead of `mt_rand()`. ## Meta * Phiên bản **2.4** * Cập nhật lần cuối **1 năm trước** * Số lượt cài đặt **300.000+** * Phiên bản WordPress ** 6.6 hoặc cao hơn ** * Đã kiểm tra lên đến **6.7.5** * Phiên bản PHP ** 7.4 hoặc cao hơn ** * Ngôn ngữ * [Albanian](https://sq.wordpress.org/plugins/really-simple-captcha/), [Basque](https://eu.wordpress.org/plugins/really-simple-captcha/), [Catalan](https://ca.wordpress.org/plugins/really-simple-captcha/), [Chinese (China)](https://cn.wordpress.org/plugins/really-simple-captcha/), [Chinese (Taiwan)](https://tw.wordpress.org/plugins/really-simple-captcha/), [Croatian](https://hr.wordpress.org/plugins/really-simple-captcha/), [Czech](https://cs.wordpress.org/plugins/really-simple-captcha/), [Danish](https://da.wordpress.org/plugins/really-simple-captcha/), [Dutch](https://nl.wordpress.org/plugins/really-simple-captcha/), [Dutch (Belgium)](https://nl-be.wordpress.org/plugins/really-simple-captcha/), [English (Australia)](https://en-au.wordpress.org/plugins/really-simple-captcha/), [English (Canada)](https://en-ca.wordpress.org/plugins/really-simple-captcha/), [English (New Zealand)](https://en-nz.wordpress.org/plugins/really-simple-captcha/), [English (South Africa)](https://en-za.wordpress.org/plugins/really-simple-captcha/), [English (UK)](https://en-gb.wordpress.org/plugins/really-simple-captcha/), [English (US)](https://wordpress.org/plugins/really-simple-captcha/), [French (Canada)](https://fr-ca.wordpress.org/plugins/really-simple-captcha/), [French (France)](https://fr.wordpress.org/plugins/really-simple-captcha/), [Galician](https://gl.wordpress.org/plugins/really-simple-captcha/), [German](https://de.wordpress.org/plugins/really-simple-captcha/), [Hungarian](https://hu.wordpress.org/plugins/really-simple-captcha/), [Italian](https://it.wordpress.org/plugins/really-simple-captcha/), [Japanese](https://ja.wordpress.org/plugins/really-simple-captcha/), [Lithuanian](https://lt.wordpress.org/plugins/really-simple-captcha/), [Marathi](https://mr.wordpress.org/plugins/really-simple-captcha/), [Persian](https://fa.wordpress.org/plugins/really-simple-captcha/), [Portuguese (Brazil)](https://br.wordpress.org/plugins/really-simple-captcha/), [Romanian](https://ro.wordpress.org/plugins/really-simple-captcha/), [Russian](https://ru.wordpress.org/plugins/really-simple-captcha/), [Slovak](https://sk.wordpress.org/plugins/really-simple-captcha/), [Spanish (Argentina)](https://es-ar.wordpress.org/plugins/really-simple-captcha/), [Spanish (Chile)](https://cl.wordpress.org/plugins/really-simple-captcha/), [Spanish (Colombia)](https://es-co.wordpress.org/plugins/really-simple-captcha/), [Spanish (Ecuador)](https://es-ec.wordpress.org/plugins/really-simple-captcha/), [Spanish (Mexico)](https://es-mx.wordpress.org/plugins/really-simple-captcha/), [Spanish (Spain)](https://es.wordpress.org/plugins/really-simple-captcha/), [Spanish (Venezuela)](https://ve.wordpress.org/plugins/really-simple-captcha/), [Swahili](https://sw.wordpress.org/plugins/really-simple-captcha/), [Swedish](https://sv.wordpress.org/plugins/really-simple-captcha/), [Tibetan](https://bo.wordpress.org/plugins/really-simple-captcha/), [Turkish](https://tr.wordpress.org/plugins/really-simple-captcha/), và [Ukrainian](https://uk.wordpress.org/plugins/really-simple-captcha/). * [Dịch sang ngôn ngữ của bạn](https://translate.wordpress.org/projects/wp-plugins/really-simple-captcha) * Thẻ * [captcha](https://vi.wordpress.org/plugins/tags/captcha/) * [Nâng cao](https://vi.wordpress.org/plugins/really-simple-captcha/advanced/) ## Đánh giá 4.2 trên 5 sao. * [ 90 5-star reviews ](https://wordpress.org/support/plugin/really-simple-captcha/reviews/?filter=5) * [ 15 4-star reviews ](https://wordpress.org/support/plugin/really-simple-captcha/reviews/?filter=4) * [ 1 3-star review ](https://wordpress.org/support/plugin/really-simple-captcha/reviews/?filter=3) * [ 4 2-star reviews ](https://wordpress.org/support/plugin/really-simple-captcha/reviews/?filter=2) * [ 19 1-star reviews ](https://wordpress.org/support/plugin/really-simple-captcha/reviews/?filter=1) [Your review](https://wordpress.org/support/plugin/really-simple-captcha/reviews/#new-post) [Xem tất cả đánh giá](https://wordpress.org/support/plugin/really-simple-captcha/reviews/) ## Những người đóng góp * [ Rock Lobster Inc. ](https://profiles.wordpress.org/rocklobsterinc/) * [ Takayuki Miyoshi ](https://profiles.wordpress.org/takayukister/) ## Hỗ trợ Có điều gì muốn nói? cần giúp đỡ? [Xem diễn đàn hỗ trợ](https://wordpress.org/support/plugin/really-simple-captcha/) ## Ủng hộ Bạn có muốn hỗ trợ vào sự phát triển của plugin này? [ Ủng hộ plugin này ](https://contactform7.com/donate/)