/**
* Retrieve the CAPTCHA code
*
*@param $key
*
* @return mixed|null
*/
protected function getExpectedCode($key)
{
$arrayZendSession = new SessionArrayStorage();
if ($this->session->has($key)) {
$sessionKey = $this->session->get($key);
$this->session->remove($key);
$captchaSession = $arrayZendSession->offsetGet($sessionKey);
$arrayZendSession->offsetUnset($sessionKey);
if ($captchaSession instanceof ArrayObject) {
$word = $captchaSession->offsetGet('word');
$captchaSession->offsetUnset('word');
return $word;
}
}
return null;
}