<?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 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8