set_cookie problem with expire time

[eluser]Ornis[/eluser]
Hallo

I set a persistent cookie in a helper file which works perfectly:

Code:

$cookie = array(
        'name'   => 'PersistentCookie',
        'value'  => $value,
        'expire' => time() + 31 * 24 * 60 * 60,
        'domain' => '.mywebsite.ch',
        'path'   => '/',
        'prefix' => '');
$CI->input->set_cookie($cookie);

However, the cookie expires `At The End Of Session`, not at the requested time.

Thanks for your help.

Martin