lnkohana/system/utf8/strrpos.php

<?php defined('SYSPATH') OR die('No direct script access.');
/**
 * UTF8::strrpos
 *
 * @package    Kohana
 * @author     Kohana Team
 * @copyright  (c) 2007-2012 Kohana Team
 * @copyright  (c) 2005 Harry Fuecks
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
 */
function _strrpos($str, $search, $offset = 0)
{
	$offset = (int) $offset;

	if (UTF8::is_ascii($str) AND UTF8::is_ascii($search))
		return strrpos($str, $search, $offset);

	if ($offset == 0)
	{
		$array = explode($search, $str, -1);
		return isset($array[0]) ? UTF8::strlen(implode($search, $array)) : FALSE;
	}

	$str = UTF8::substr($str, $offset);
	$pos = UTF8::strrpos($str, $search);
	return ($pos === FALSE) ? FALSE : ($pos + $offset);
}