system/helper/utf8.php

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<?php
if (extension_loaded('mbstring')) {
	mb_internal_encoding('UTF-8');

	function utf8_strlen($string) {
		return mb_strlen($string);
	}

	function utf8_strpos($string, $needle, $offset = 0) {
		return mb_strpos($string, $needle, $offset);
	}

	function utf8_strrpos($string, $needle, $offset = 0) {
		return mb_strrpos($string, $needle, $offset);
	}

	function utf8_substr($string, $offset, $length = null) {
		if ($length === null) {
			return mb_substr($string, $offset, utf8_strlen($string));
		} else {
			return mb_substr($string, $offset, $length);
		}
	}

	function utf8_strtoupper($string) {
		return mb_strtoupper($string);
	}

	function utf8_strtolower($string) {
		return mb_strtolower($string);
	}
} elseif (function_exists('iconv')) {
	function utf8_strlen($string) {
		return iconv_strlen($string, 'UTF-8');
	}

	function utf8_strpos($string, $needle, $offset = 0) {
		return iconv_strpos($string, $needle, $offset, 'UTF-8');
	}

	function utf8_strrpos($string, $needle) {
		return iconv_strrpos($string, $needle, 'UTF-8');
	}

	function utf8_substr($string, $offset, $length = null) {
		if ($length === null) {
			return iconv_substr($string, $offset, utf8_strlen($string), 'UTF-8');
		} else {
			return iconv_substr($string, $offset, $length, 'UTF-8');
		}
	}

	function utf8_strtolower($string) {
		static $upper_to_lower;

		if ($upper_to_lower == null) {
			$upper_to_lower = array(
				0x0041 => 0x0061,
				0x03A6 => 0x03C6,
				0x0162 => 0x0163,