On the user main page in the screen options, you have some choices for displaying user information e.g.. e-mail, role, posts etc..

Is there a way to be able to display the user's unique ID?

  • Exactly where do you see this "user tracking" stuff? Was this added by a plugin perhaps? – s_ha_dum May 30 '13 at 17:04
  • At the top of the screen you have 'Screen Options' It allows you to show Role, e-mail, posts etc.. I want to add User ID to the list. Not added by any plugin, default Wordpress functionality. – Romes May 30 '13 at 17:12
  • Ahh... you aren't talking about tracking at all. Just showing or hiding those meta boxes. – s_ha_dum May 30 '13 at 17:14
  • I guess you are right. I've updated my question. – Romes May 30 '13 at 17:15

You need to use the filter 'manage_' . $screen->id . '_columns' to add a column and manage_users_custom_column to display its value.

add_filter( 'manage_users_columns', 'column_register_wpse_101322' );
add_filter( 'manage_users_custom_column', 'column_display_wpse_101322', 10, 3 );

function column_register_wpse_101322( $columns ) 
    $columns['uid'] = 'ID';
    return $columns;

function column_display_wpse_101322( $empty, $column_name, $user_id ) 
    if ( 'uid' != $column_name )
        return $empty;

    return "<strong>$user_id</strong>";

With this, the ID will show up in the Screen Options as well.

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