use Georgechem\Captcha\Captcha\Captcha;

require __DIR__ . '/vendor/autoload.php';
// Init session storage for Captcha - expire time can be edited (default 5 minutes)
$captcha = Captcha::getInstance();
// create end echo image with captcha
$captcha->create();

使用说明: (验证码验证)

use Georgechem\Captcha\Captcha\Captcha;

require __DIR__ . '/vendor/autoload.php';

$captcha = Captcha::getInstance();
// @Returns bool, true on success, false on failure
$captcha->verify($text);