Disable admin bar from all non admins and editors

gistfile1.txt

// Disabled wordpress admin bar to all non admininstrators or editors - Jane James

function disable_admin_bar() {
   if (current_user_can('administrator') || current_user_can('editor') ) {
     // user can view admin bar
     show_admin_bar(true); // this line isn't essentially needed by default...
   } else {
     // hide admin bar
     show_admin_bar(false);
   }
}