<?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 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8