<?php

use Laminas\Captcha\Figlet;

$captcha = new Figlet(['wordLen' => 3]);

// generates captcha token and stores it in Session
$captcha->generate();
$captchaStr = $captcha->getFiglet()
    ->render($captcha->getWord());

echo '<pre>' . $captchaStr . '</pre>';

// two possible user inputs.
// id = generated session id
// input = user input
$wrongInput = [
    'id' => 1,
    'input' => 'asdf',
];
$rightInput = [
    'id' => $captcha->getId(),
    'input' => $captcha->getWord(),
];

// validate user input
dump($captcha->isValid($wrongInput));
dump($captcha->isValid($rightInput));

   _____    _____             
  / ___//  |  ___||     ___   
  \___ \\  | ||__      /   || 
  /    //  | ||__     | [] || 
 /____//   |_____||    \__ || 
`-----`    `-----`      -|_|| 
                         `-`  

^ false

^ true

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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8