El objetivo de este proyecto es la generación de captchas de seguridad básica generando imágenes relativamente amigables para el usuario.

Example

This project provides the SimpleCaptcha class.

The images are similar to google captchas.

Basic example:

session_start();
$captcha = new SimpleCaptcha();
// Change configuration...
//$captcha->wordsFile = null;           // Disable dictionary words
//$captcha->wordsFile = 'words/es.txt'; // Enable spanish words
//$captcha->session_var = 'secretword'; // Change session variable
$captcha->CreateImage();

... will output:

You can validate the php captcha with:

if (empty($_SESSION['captcha']) || strtolower(trim($_REQUEST['captcha'])) != $_SESSION['captcha']) {
    return "Invalid captcha";
}

You can see a live example here: http://joserodriguez.cl/cool-php-captcha.

More examples

Background and foreground colors, dictionary words, non-dictionary random words, blur, shadows, JPEG and PNG support: