Nice to meet you.
I use wp-members with Wordpress to manage users.
When there is information that I want to be displayed only to a specific user among the logged-in users,
As shown below, the user IDs 1, 2, and 3 are set, but only 1 is displayed.
Is the ID specification method incorrect?

global $current_user;
  get_currentuserinfo ();
  if ($current_user->ID == "1,2,3") {
    echo ' test ';
  }