<?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