WordPress - Show comment-numbers in a comment-thread

show_comment_numbers.php

<?php
/**
 * Plugin Name: Show Comment Number
 * Plugin URI: http://neun12.de
 * Text Domain: 
 * Domain Path: 
 * Description: Dieses Plugin zeigt die laufende Kommentar-Nummer in einem Kommentar-Thread an.
 * Author: Ralf Albert
 * Version: 0.1
 * Author URI: http://neun12.de/
 * Donate URI: http://neun12.de/
 * License: GPL
 * Last change: 05.12.11 04:00:00
 */ 

/**
License:
==============================================================================
Copyright 2010 Ralf Albert  (email : neun12@googlemail.com)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Requirements:
==============================================================================
This plugin requires WordPress >= 2.8 and tested with PHP Interpreter >= 5.2.9.

*/

// do not use this script without WordPress
if( ! defined( 'ABSPATH' ) )
	die( "Cheetin' uh!?" );
else
	add_action( 'plugins_loaded', array( 'ShowCommentNumbers', 'start_plugin' ) );
	
if( ! class_exists( 'ShowCommentNumbers' ) ){
	
	class ShowCommentNumbers
	{		
		private static $instance = NULL;
		private static $comment_count = 1; 
		
		public function __construct(){
			add_action( 'init', array( &$this, 'cpt_hook' ) );
		}
		
		public static function start_plugin(){
			if( NULL == self::$instance )
				self::$instance = new self;
				
			return self::$instance;
		}

		public function cpt_hook(){			
			add_action( 'comment_text', array( &$this, 'show_comment_number' ) );
		}
		
		public static function show_comment_number( $content ){
			global $current_user;
			if( ! isset( $current_user->data->wp_capabilities['administrator'] ) || 1 != $current_user->data->wp_capabilities['administrator'] )
				return $content;
				
			$content .= '<hr />#' . self::$comment_count;
			self::$comment_count++;
			
			return $content;
		}
				
	} // .end class ShowCommentNumbers
} // .end if-class-exists