https://github.com/theodorejb/responsive-captcha

A PHP library for generating random, accessible arithmetic and logic questions
https://github.com/theodorejb/responsive-captcha

captcha php

Last synced: about 1 year ago
JSON representation

A PHP library for generating random, accessible arithmetic and logic questions

• Host: GitHub
• URL: https://github.com/theodorejb/responsive-captcha
• Owner: theodorejb
• License: mit
• Created: 2012-12-24T17:55:20.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2020-12-11T18:52:50.000Z (over 5 years ago)
• Last Synced: 2025-03-25T13:11:21.249Z (over 1 year ago)
• Topics: captcha, php
• Language: PHP
• Homepage:
• Size: 41 KB
• Stars: 12
• Watchers: 6
• Forks: 6
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE.md

Awesome Lists containing this project

README

          
# Responsive Captcha

[![Packagist Version](https://img.shields.io/packagist/v/theodorejb/responsive-captcha.svg)](https://packagist.org/packages/theodorejb/responsive-captcha)

Prevent form spam by generating random, accessible arithmetic and logic questions.

Examples:

* "What is the fourth letter in snowboard?"

* "What is the sum of four and six?"

* "What is eight multiplied by two?"

* "Which is smallest: sixty-six, one hundred, or twenty-two?"

Users can respond with either the numeric or textual version of an answer (e.g. "16" or "sixteen").

For background info on this project, see my blog post: https://theodorejb.me/2012/12/30/responsive-captcha/

## Install via Composer

`composer require theodorejb/responsive-captcha`

## Usage

1. Generate a random question:

    ```php

    use function theodorejb\ResponsiveCaptcha\{randomQuestion, checkAnswer};

    $qa = randomQuestion();

    $realAnswer = $qa->getAnswer(); // save somewhere (e.g. in session or encrypted single-use token)

    ```

2. Display question in form:

    ```html+php

    

	    = $qa->getQuestion() ?>

        

	

	```

3. Check whether the user's response is correct:

    ```php

    $answer = filter_input(INPUT_POST, "captcha");

    if ($answer !== null) {

        if (checkAnswer($answer, $realAnswer)) {

            // code to execute if the captcha answer is correct

        } else {

            // the answer is incorrect - show an error to the user

        }

    }

    ```