theodorejb/responsive-captcha

Generate mobile-friendly, accessible CAPTCHAs

Maintainers

Details

github.com/theodorejb/Responsive-Captcha

Source

Issues

Installs: 33

Dependents: 0

Suggesters: 0

Security: 0

Stars: 12

Watchers: 6

Forks: 6

Open Issues: 0

v3.0.1 2020-08-31 16:36 UTC

Requires

  • php: >=7.1

Requires (Dev)

MIT a0ed322303a1f9786718807516b26c3b7d39ab90

  • Theodore Brown <theodorejb.woop@outlook.com>

This package is auto-updated.

Last update: 2024-12-12 04:08:23 UTC

README

Packagist Version

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:

    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:

    <label>
    <?= $qa->getQuestion() ?>
    <input type="text" name="captcha" />
</label>

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

    $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
    }
}