$cookies = new Phalcon\Http\Response\Cookies();
$cookies->set(
'remember-me',
'some value',
time() + 15 * 86400
);
или через сервис $di->set(
'cookies',
function () {
$cookies = new Phalcon\Http\Response\Cookies();
$cookies->useEncryption(false);
return $cookies;
}
);