https://github.com/krowinski/one-click-captcha

Simple captcha that requires from user to only click a cut circle on image with several other circles. You can customize color of circles, background, width and height of image. Its very lightweight require no js just simple form in html and php gd extension.
https://github.com/krowinski/one-click-captcha

captcha captcha-image captcha-validation circle cut php position

Last synced: 10 months ago
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Simple captcha that requires from user to only click a cut circle on image with several other circles. You can customize color of circles, background, width and height of image. Its very lightweight require no js just simple form in html and php gd extension.

• Host: GitHub
• URL: https://github.com/krowinski/one-click-captcha
• Owner: krowinski
• Created: 2013-04-14T18:11:37.000Z (about 13 years ago)
• Default Branch: master
• Last Pushed: 2018-08-06T22:32:32.000Z (almost 8 years ago)
• Last Synced: 2025-04-07T20:56:18.006Z (about 1 year ago)
• Topics: captcha, captcha-image, captcha-validation, circle, cut, php, position
• Language: PHP
• Homepage:
• Size: 23.4 KB
• Stars: 14
• Watchers: 2
• Forks: 5
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

          
# OneClick captcha 

[![Build Status](https://travis-ci.org/krowinski/one-click-captcha.svg?branch=1.2)](https://travis-ci.org/krowinski/one-click-captcha)

[![Latest Stable Version](https://poser.pugx.org/krowinski/one-click-captcha/v/stable)](https://packagist.org/packages/krowinski/one-click-captcha) [![Total Downloads](https://poser.pugx.org/krowinski/one-click-captcha/downloads)](https://packagist.org/packages/krowinski/one-click-captcha) [![Latest Unstable Version](https://poser.pugx.org/krowinski/one-click-captcha/v/unstable)](https://packagist.org/packages/krowinski/one-click-captcha) [![License](https://poser.pugx.org/krowinski/one-click-captcha/license)](https://packagist.org/packages/krowinski/one-click-captcha)

This lib can perform CAPTCHA validation based on user clicks on circles.

It render an image with several circles on random positions. Only one circle appears cut.

The class performs CAPTCHA validation by checking the position where the user clicks on the image to verify it it is inside of the circle that is cut.

The generated image is served in PNG format. The values of the rendered circles are stored in session variables for subsequent validation.

The size and colors of the image and the circles are configurable parameters.

###### 1. install using composer ######

```bash

composer require krowinski/one-click-captcha

```

###### 2. example ######

```php

include __DIR__ . '/../vendor/autoload.php';

error_reporting(E_ALL);

$OneClickCaptchaServiceFactory = new \OneClickCaptcha\Service\OneClickCaptchaServiceFactory();

$oneClickCaptcha = $OneClickCaptchaServiceFactory->getOneClickCaptcha();

// simple demonstration!

$request = isset($_GET['get_captcha']) ? $_GET['get_captcha'] : '';

if ($request === 'true') {

    $oneClickCaptcha->showCaptcha();

} else {

    if (isset($_REQUEST['position'][0], $_REQUEST['position'][1])) {

        if (true === $oneClickCaptcha->validate($_REQUEST['position'][0], $_REQUEST['position'][1])) {

            echo '
You are human!!
';

        } else {

            echo '
Wrong!
';

        }

    }

}

// this is all html you need to validate captcha

echo '


	

';

```