Usage

A basic use case resembles the following:

// Originating request:
$captcha = new Zend\Captcha\Figlet([
    'name'    => 'foo',
    'wordLen' => 6,
    'timeout' => 300,
]);

$id = $captcha->generate();

// This will output a Figlet string:
echo $captcha->getFiglet()->render($captcha->getWord());

// On a subsequent request:
// Assume a captcha setup as before, with corresponding form fields, the value
// of $_POST['foo'] would be a key/value array containing:
// - id => captcha ID
// - input => captcha value
if ($captcha->isValid($_POST['foo'], $_POST)) {
    // Validated!
}

The above example demonstrates usage of a FIGlet string for the CAPTCHA. zend-captcha also provides adapters for:

• Images
• reCAPTCHA

and an interface allowing you to define and implement your own solutions.

The options required will vary based on the adapter you use, but in all cases, you will use the combination of:

• generate()
• some mechanism of the adapter to render the CAPTCHA
• isValid() to validate a submitted CAPTCHA solution

zend-form integration

zend-form contains integration with zend-captcha via the class Zend\Form\Element\Captcha; read the documentation on the CAPTCHA form element for more details.