admin bar hidden for super admin

Hi, love your plugin. But it hides the admin bar for super admins even though it’s set to show for admins (and correctly does that).-

I asked Claude why (I didn’t have time to confirm or not if this is accurate) and this is what I got.

File: public/class-hide-admin-bar-based-on-user-roles-public.php:188-200

The should_hide_for_user_capability() method has a PHP gotcha with explode():

// When hab_capabilities is "" (empty — no caps entered in the Capabilities Blacklist)...
$hab_capabilities = explode(",", "");
// Returns: [""]  ← array with ONE empty-string element, NOT an empty array

PHP’s explode(",", "") always returns [""] rather than []. The code then loops over that array and calls:

current_user_can("")  // called with an empty string

For super admins, WordPress intercepts user_has_cap and grants every capability check — including an empty-string cap — returning true. For regular users, this call returns false because "" isn’t in their allcaps array. That’s why only the super admin is affected.

In the meantime I didn’t touch the plugin code and fixed it with a snippet

<?php
/**

• Fix: “Hide Admin Bar Based On User Roles” incorrectly hides the bar
• for super admins when the Capabilities Blacklist field is empty.
  *
• Root cause: explode(“,”,””) returns [“”], and current_user_can(“”)
• returns true for super admins due to WordPress’s super admin bypass.
  *
• This filter runs after the plugin makes its show_admin_bar(false) call
• and restores visibility for super admins.
  */
  add_filter( ‘show_admin_bar’, function ( $show ) {
  if ( is_super_admin() ) {
  return true;
  }
  return $show;
  }, 20 );