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  Classes of Kacper Rowinski   OneClickCaptcha   Download  
Role: Documentation
Content type: text/markdown
Description: Documentation
Class: OneClickCaptcha
CAPTCHA validation based on user clicks on circles
Author: By
Last change: Update of
Date: 4 months ago
Size: 2,282 bytes


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OneClick captcha

Build Status Latest Stable Version Total Downloads Latest Unstable Version License

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
composer require krowinski/one-click-captcha
2. example

include __DIR__ . '/../vendor/autoload.php';
$OneClickCaptchaServiceFactory = new \OneClickCaptcha\Service\OneClickCaptchaServiceFactory();
$oneClickCaptcha = $OneClickCaptchaServiceFactory->getOneClickCaptcha();
// simple demonstration!
$request = isset($_GET['get_captcha']) ? $_GET['get_captcha'] : '';
if ($request === 'true') {
} else {
    if (isset($_REQUEST['position'][0], $_REQUEST['position'][1])) {
        if (true === $oneClickCaptcha->validate($_REQUEST['position'][0], $_REQUEST['position'][1])) {
            echo '<h3>You are human!!</h3>';
        } else {
            echo '<h3>Wrong!</h3>';
// this is all html you need to validate captcha
echo '
<form action="example.php" method="POST">
	<input type="image" src="example.php?get_captcha=true" name="position[]"/>