I've been asked to add a sort of safety mechanism to a site where a user can only access their profile if they have a cookie set after logging in, and they can only have a maximum of 3 cookies. I've made a table in the database to store the cookies, so I can keep count of them.

I don't really know how WordPress works, but I've been able to find out that I need to edit the theme's functions.php file and add an action using wp_login. I've edited the functions.php file, added the action, request the user ID, and it returns 0. I know that this is how wp_get_current_user is supposed to work, it returns 0 if there's no one logged in; however the user IS logged in, but it still won't return the ID. Here's the code:

add_action( 'wp_login', 'login_cookie' );
function login_cookie() {
    global $wpdb;
    $user = wp_get_current_user();
    //Get current user
    $id = $user->ID;

    if(!isset($_COOKIE['userCookie'])) {
        // Query the database to see how many cookies they have used
        $cookie_count = $wpdb->get_var("SELECT COUNT(*) FROM wp_cookies WHERE user_id=".$id."");
        // If the returned value is bigger or equal to 3 than the user cannot login
        // they will be logged out, and redirected
        if($cookie_count >= 3) {
        //Else they can login and they recieve a new cookie, which will get inserted into the database 
        else {
            $value = password_hash($id,PASSWORD_DEFAULT);
            setcookie('userCookie', $value, time()+360000*24*100, "", "",false);
                [ 'user_id'=>$id, 'cookie_value'=>$value ],
                [ '%d', '%s' ]

Also this should only affect normal users, not admins. Any ideas for that?

2 Answers 2


wp_login hook provides access to two parameters: $user->user_login (string) and $user ( WP_User ). To pass them into your function you will need to add a priority (default is 10) and request 2 arguments from the add_action() call:

function login_cookie($user_login, $user) {
    global $wpdb;

    var_dump($user); // get WP_User object

    //Get current user ID
    $id = $user->ID;

add_action( 'wp_login', 'login_cookie', 10, 2 );
  • Thank you very much! It is now working as it was intented. Commented May 8, 2015 at 9:49
  • wc glad to help :)
    – Jayson
    Commented May 8, 2015 at 10:00

Actually the wp_login hook is passing the user object in its parameter.

function login_cookie( $user_login, $user ) {
    $user_id = $user->ID; // get user id
    // your next code
add_action( 'wp_login', 'login_cookie', 10, 2 );

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