Create a role in WP for when to log in to be redirected

Question

I need to create a function in Wordpress so that when the user logs in automatically is redirected to another link, here is my code as is:

$user_id = get_current_user_id();
if ($user_id == 2) { //aqui adicionamos o ID do usuário cadastrado

    function remove_menus(){

        remove_menu_page( 'index.php' ); 
        remove_menu_page( 'about.php' );
        remove_menu_page( 'edit.php' ); 
        remove_menu_page( 'upload.php' ); 
        remove_menu_page( 'edit.php?post_type=page' );
        remove_menu_page( 'edit-comments.php' ); 
        remove_menu_page( 'themes.php' ); 
        remove_menu_page( 'users.php' ); 
        remove_menu_page( 'tools.php' ); 
        remove_menu_page( 'options-general.php' ); 
        remove_menu_page( 'admin.php?page=revslider' ); 
        remove_menu_page( 'admin.php?page=wpcf7' ); 
        remove_menu_page( 'admin.php?page=loco' );  
    }

//aqui é onde tento criar a função para fazer esse redirecionamento mais não funcionou
    function realocar (){
        if (isset($_POST[get_current_user_id == 2])){
            $url = 'aqui vem o link pra redirecionar';
            header("Location: $url");
        }

    }

    add_action( 'admin_menu', 'remove_menus', 'realocar' );


} else {

}

Answer 1

There is a filter (read about filters here) in Wordpress called login_redirect. In a very short way, filters allow you to perform certain actions on "events" data that occur in the WP stream. The very description of this particular filter is

The login_redirect filter is used to change the Location redirected to after logging in. This could be the Location set by the "redirect_to" Parameter sent to the login page.

That is, you can use it to redirect the user after login. The example that comes from the documentation serves to direct the admins to the Dashboard, and common users for the home page. See:

function my_login_redirect( $redirect_to, $request, $user ) {
    //is there a user to check?
    if ( isset( $user->roles ) && is_array( $user->roles ) ) {
        //check for admins
        if ( in_array( 'administrator', $user->roles ) ) {
            // redirect them to the default place
            return $redirect_to;
        } else {
            return home_url();
        }
    } else {
        return $redirect_to;
    }
}

add_filter( 'login_redirect', 'my_login_redirect', 10, 3 );

The documentation still alerts to the fact that the variable $user may not be available at the time of execution, and suggests using global $user. So by making a simplified use case, you might have something like this

function meu_redirect() {

    global $user;
    if ( isset( $user->roles ) && is_array( $user->roles ) ) {
        //usuário existe
        return "http://meusite.com";
    }
}

add_filter( 'login_redirect', 'meu_redirect', 10, 3 );

BONUS:

If you are using the method wp_login_form(), you can use the parameter redirect that it contains.

There is still the method wp_redirect(), that does well what it says. Just stay tuned to use the exit() in the end.