Сравнивать хотя бы с 20 последними проголосовавшими IP при голосовании в extravote - Модули и плагины

<?php
/*------------------------------------------------------------------------
# plg_extravote - ExtraVote Plugin
# ------------------------------------------------------------------------
# author    Joomla!Vargas
# copyright Copyright (C) 2010 Joomla.vargas.co.cr. All Rights Reserved.
# @license - http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
# Websites: http://joomla.vargas.co.cr
# Technical Support:  Forum - http://joomla.vargas.co.cr/forum
-------------------------------------------------------------------------*/

// Set flag that this is a parent file
define('_JEXEC', 1);

// No direct access.
defined('_JEXEC') or die;

define( 'DS', DIRECTORY_SEPARATOR );

define('JPATH_BASE', dirname(__FILE__).DS.'..'.DS.'..'.DS.'..'.DS.'..' );

require_once ( JPATH_BASE .DS.'includes'.DS.'defines.php' );
require_once ( JPATH_BASE .DS.'includes'.DS.'framework.php' );

jimport('joomla.database.database');
jimport('joomla.database.table');

$app = JFactory::getApplication('site');
$app->initialise();

$user = JFactory::getUser();

$plugin	= JPluginHelper::getPlugin('content', 'extravote');

$params = new JRegistry;
$params->loadString($plugin->params);

if ( $params->get('access') == 1 && !$user->get('id') ) {
	echo 'login';
} else {
	$user_rating = JRequest::getVar('user_rating');
	$cid = 0;
	$xid = JRequest::getInt('xid');
	if ( $params->get('article_id') || $xid == 0 ) {
		$cid = JRequest::getInt('cid');
	}
	$db  = JFactory::getDbo();
	if ($user_rating >= 0.5 && $user_rating <= 5) {
		$currip = $_SERVER['REMOTE_ADDR'];
		$query = "SELECT * FROM #__content_extravote WHERE content_id = ".$cid." AND extra_id = " . $xid;
		$db->setQuery( $query );
		$votesdb = $db->loadObject();
		if ( !$votesdb ) {
			$query = "INSERT INTO #__content_extravote ( content_id, extra_id, lastip, rating_sum, rating_count )"
			. "\n VALUES ( " . $cid . ", " . $xid . ", " . $db->Quote( $currip ). ", " . $user_rating . ", 1 )";
			$db->setQuery( $query );
			$db->query() or die( $db->getErrorMsg() );
		} else {
			if ($currip != ($votesdb->lastip)) {
				$query = "UPDATE #__content_extravote"
				. "\n SET rating_count = rating_count + 1, rating_sum = rating_sum + " .   $user_rating . ", lastip = " . $db->Quote( $currip )
				. "\n WHERE content_id = ".$cid." AND extra_id = " . $xid;
				$db->setQuery( $query );
				$db->query() or die( $db->getErrorMsg() );
			} else {
				echo 'voted';
				exit();
			}
		}
		echo 'thanks';
	}
}