Wordpress promote subscriber to contributor only by visiting a page

Question

I'm trying to promote my Wordpress users when they visit certain link but I'm not sure how to do that.

I found this function and placed it on the page where I want that change to be made. I though it might do the trick, but it won't:

function update_roles() {
   global $wpdb;
   $author = wp_get_current_user();

  $author->remove_role( 'subscriber' );
  $author->add_role( 'contributor' );
}

Any clues on how to do this?

Answer 1

wp_update_user( [ 'ID' =>get_current_user_id(), 'role' => 'contributor' ] ); 

You can use this code in your page template to change your user role.