<?php

use Zend\Captcha\Figlet;
use Zend\Debug\Debug;

$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
Debug::dump($captcha->isValid($wrongInput));
Debug::dump($captcha->isValid($rightInput));

  ______   _    _    _    _   
 /_   _// | || | || | |  | || 
 `-| |,-  | || | || | |/\| || 
   | ||   | \\_/ || |  /\  || 
   |_||    \____//  |_// \_|| 
   `-`'     `---`   `-`   `-` 
                              

bool(false)

bool(true)

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PHP 7.4, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10