zend_captcha always fails isValid()

Posted by Grant Collins on Stack Overflow See other posts from Stack Overflow or by Grant Collins
Published on 2009-12-13T11:34:33Z Indexed on 2010/05/16 13:50 UTC
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Hi,

I've got an issue with Zend_Captcha always returning false when the page is submitted and the captcha's isValid() method is being called. It's driving my nuts because this as far as I am concerned should work.

I start by declaring this at the top of the action function of the controller

$captcha = new Zend_Captcha_Image('captcha',
    array(
        'captcha' => array(
            'name' => 'graduatesignupcaptcha',
            'wordlen' => 6,     
            'font' => $this->config->captcha->font,
            'imgDir' => $baseUrl.'/images/captcha/',
            'imgUrl' => $this->config->webserver->name.'/images/captcha/',
        )
    )
);
$captcha->setHeight(80)
        ->setTimeout(300);

I do usual form validation and that all works, however it is when I come to validate that the value entered into form for the captcha it always returns false.

//next we check the captcha text to ensure that the form is a person not a script    
$captchaText = $form->getElement('captchainput')->getValue();
$captchaId = $form->getElement('captchaid')->getValue();
//$captchaSession = new Zend_Session_Namespace('Zend_Form_Captcha_'.$captchaId);


$captchaArray = array(
 'id' => $captchaId,
 'input' => $captchaText     
);



if(!$captcha->isValid($captchaArray)){

 $log->log(implode(",",$captcha->getErrors()), Zend_Log::DEBUG); 

 $form->getElement('captchainput')->setErrors(array('messages' => 'Bad security code'));     
 $formFailed = true;
}

I've check to ensure that the id that I am getting and storing as a hidden element in my form match the image that is being generated but no matter what I do this always fails.

Am I missing something simple here?? Or is there a better way of dealing with this??

Thanks,

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