/**
* Generates a hash code that can be used for client side validation.
* @param string $code Displayed captcha code in generated image
* @return int Sum of ASCII codes for all $code characters. Used for client-side validation
*/
public function generateValidationHash($code)
{
switch ($this->mode) {
case CaptchaExtendedAction::MODE_DEFAULT:
return parent::generateValidationHash($code);
break;
default:
/**
* We must encode result stored in session
* @var CHttpSession
*/
$session = Yii::app()->session;
$key = $this->getSessionKey();
if ($this->mode != CaptchaExtendedAction::MODE_WORDS) {
// only in mode WORDS we must calculate ORD values of plain string
// but we cannot use framework implementation since we need multibyte support
$code = $session[$key . 'result'];
}
$code = preg_replace('/\\s/', '', $code);
$code = urlencode($code);
for ($h = 0, $i = mb_strlen($code) - 1; $i >= 0; --$i) {
$chr = mb_substr($code, $i, 1, 'utf-8');
if (trim($chr) != '') {
$h += ord($chr);
}
}
return $h;
}
}
