Captcha helper problem

[eluser]Molchy[/eluser]
[quote author="loca" date="1307700102"]hi all,
I just use captcha helper for create a captcha image.

I use code as in CI UserGuide, here are some of them:

Code:

$vals = array(
            'img_path' => './captcha/',
            'img_url' => base_url().'captcha/',
            'expiration' => 15
            );
        
        $cap = create_captcha($vals);

I set expiration as show above, but the captcha image in my captcha folder not be removed automatically after 15 seconds. And in database, I have the same problem.

Code:

$expiration = time()-15; // Two hour limit
$this->db->query("DELETE FROM captcha WHERE captcha_time < ".$expiration);

[/quote]

I think this is wrong: $expiration = time()-15; || database time is in different format

Regarding image on server i suggest checking ftp folder permission.