original_string: public function subscribed_users(user_selector_base $existingusers) {
          $output  = $this->output->box_start('subscriberdiv boxaligncenter');
          $output .= html_writer::tag('p', get_string('forcesubscribed', 'forum'));
          $output .= $existingusers->display(true);
          $output .= $this->output->box_end();
          return $output;
      }
code: public function subscribed_users(user_selector_base $existingusers) {
          $output  = $this->output->box_start('subscriberdiv boxaligncenter');
          $output .= html_writer::tag('p', get_string('forcesubscribed', 'forum'));
          $output .= $existingusers->display(true);
          $output .= $this->output->box_end();
          return $output;
      }
code_tokens: public function subscribed_users ( user_selector_base $ existingusers ) { $ output = $ this -> output -> box_start ( 'subscriberdiv boxaligncenter' ) ; $ output .= html_writer :: tag ( 'p' , get_string ( 'forcesubscribed' , 'forum' ) ) ; $ output .= $ existingusers -> display ( true ) ; $ output .= $ this -> output -> box_end ( ) ; return $ output ; }
docstring: This is used to display a control containing all of the subscribed users so that
  it can be searched
  
  @param user_selector_base $existingusers
  @return string
docstring_tokens: This is used to display a control containing all of the subscribed users so that it can be searched