Redirect user on second visit on page

Question

I have a page like a welcome page which should be visited only once by each subscriber. After registration, they will redirected on my welcome page. Then I want that page not be available on same user for the second time, if the will try, I want them to be redirected. Is this possible?, should I use plugin? Thanks. :)

Answer 1

Following code should work. Please replace page ID and redirected url with your own.

add_action( 'send_headers', 'welcome_redirect' );
function welcome_redirect() {
    global $wp;
    // check if it is a welcome page
    if($wp->query_vars['p'] == 1){
        if(empty($_COOKIE['welcome_visited']))
            setcookie("welcome_visited", 1, time()+3600000, "/");   // set cookie 
        else {
            header('Location: '.get_site_url()); // redirect to homepage
            exit;
        }
    }
}