Cookie is not set

Question

A member sign-in form is processed in the theme's functions.php with the code below. For a test, when good credentials are entered in the form, the process is stopped with die("I LIKE COOKIE!");. So when that phrase appears in the browser it is expected that a rma_member cookie would be found in Chrome's settings. There is no cookie rma_member, just PHPSESSID, 4 wordpress..., and 2 wp... cookies. Varying arguments 2 - n in setcookie() has not (yet) made any difference. The setcookie() function returns true.

Edit: The real issue is not whether a cookie is set while in that function but whether the test for the cookie passes on the redirected page. I've proved to myself elsewhere that a cookie is not relevant in this code but on a new page. The redirect appears not to satisfy this requirement.

add_action('init', 'member_password_check');
...
    function member_password_check() {
        if (isset($_POST['_email'])) {
            $email = $_POST['_email'];
            if (empty($email)) {
                die('No email provided!');
            }
            $url = get_option('rma_base_url');
            $get_hash = get_option('rma_get_hash');
            $getURI = $url . $get_hash . '/' . $email;
            $data = wp_remote_get($getURI);
            $code = $data['response']['code'];
            if ('200' == $code) {
                //if good data returned
                $pwObject = json_decode($data['body']);
                $hash = $pwObject[0]->password;
                $password = $_POST['_password'];
                if (password_verify($password, $hash)) {
                    setcookie('rma_member', true, 3600, COOKIEPATH, COOKIE_DOMAIN);
                    die("I LIKE COOKIE!");
                    wp_redirect(home_url('member_content'));
                }
            } else {
                die('Username/password not found');
            }
        }
    }

Answer 1

This is the correct format for a cookie to expire in one hour (3600 seconds):

setcookie('rma_member', true, time() + 3600, COOKIEPATH, COOKIE_DOMAIN);

setcookie Expire: The time the cookie expires. This is a Unix timestamp so is in number of seconds since the epoch. In other words, you'll most likely set this with the time() function plus the number of seconds before you want it to expire.