使用 Zend Captcha 生成图形验证码

Question

安装依赖：

composer require zendframework/zend-session
composer require zendframework/zend-validator
composer require zendframework/zend-captcha

生产图片验证码：

$captcha = new \Zend\Captcha\Image();
$captcha->setExpiration(300);
$captcha->setFontSize(26);
$captcha->setWordlen(6);
$captcha->setFont(__DIR__ . '/../web/fonts/DejaVuSansMono-Bold.ttf');
$captcha->setImgDir(__DIR__ . '/../web/images/captcha/');
$id = $captcha->generate();
$word = $captcha->getWord();
echo $captcha->getImgUrl() . $id . '.png';

通过 getWord 方法获取文字，将文字和 id 存储在缓存中，校验缓存即可