remove_accents( string $string )

function remove_accents( $string ) {
	if ( !preg_match('/[\x80-\xff]/', $string) )
		return $string;

	if (seems_utf8($string)) {
		$chars = array(
		// Decompositions for Latin-1 Supplement
		'ª' => 'a', 'º' => 'o',
		'À' => 'A', 'Á' => 'A',
		'Â' => 'A', 'Ã' => 'A',
		'Ä' => 'A', 'Å' => 'A',
		'Æ' => 'AE','Ç' => 'C',
		'È' => 'E', 'É' => 'E',
		'Ê' => 'E', 'Ë' => 'E',
		'Ì' => 'I', 'Í' => 'I',
		'Î' => 'I', 'Ï' => 'I',
		'Ð' => 'D', 'Ñ' => 'N',
		'Ò' => 'O', 'Ó' => 'O',
		'Ô' => 'O', 'Õ' => 'O',
		'Ö' => 'O', 'Ù' => 'U',
		'Ú' => 'U', 'Û' => 'U',
		'Ü' => 'U', 'Ý' => 'Y',
		'Þ' => 'TH','ß' => 's',
		'à' => 'a', 'á' => 'a',
		'â' => 'a', 'ã' => 'a',
		'ä' => 'a', 'å' => 'a',
		'æ' => 'ae','ç' => 'c',
		'è' => 'e', 'é' => 'e',
		'ê' => 'e', 'ë' => 'e',
		'ì' => 'i', 'í' => 'i',
		'î' => 'i', 'ï' => 'i',
		'ð' => 'd', 'ñ' => 'n',
		'ò' => 'o', 'ó' => 'o',
		'ô' => 'o', 'õ' => 'o',
		'ö' => 'o', 'ø' => 'o',
		'ù' => 'u', 'ú' => 'u',
		'û' => 'u', 'ü' => 'u',
		'ý' => 'y', 'þ' => 'th',
		'ÿ' => 'y', 'Ø' => 'O',
		// Decompositions for Latin Extended-A
		'Ā' => 'A', 'ā' => 'a',
		'Ă' => 'A', 'ă' => 'a',
		'Ą' => 'A', 'ą' => 'a',
		'Ć' => 'C', 'ć' => 'c',
		'Ĉ' => 'C', 'ĉ' => 'c',
		'Ċ' => 'C', 'ċ' => 'c',
		'Č' => 'C', 'č' => 'c',
		'Ď' => 'D', 'ď' => 'd',
		'Đ' => 'D', 'đ' => 'd',
		'Ē' => 'E', 'ē' => 'e',
		'Ĕ' => 'E', 'ĕ' => 'e',
		'Ė' => 'E', 'ė' => 'e',
		'Ę' => 'E', 'ę' => 'e',
		'Ě' => 'E', 'ě' => 'e',
		'Ĝ' => 'G', 'ĝ' => 'g',
		'Ğ' => 'G', 'ğ' => 'g',
		'Ġ' => 'G', 'ġ' => 'g',
		'Ģ' => 'G', 'ģ' => 'g',
		'Ĥ' => 'H', 'ĥ' => 'h',
		'Ħ' => 'H', 'ħ' => 'h',
		'Ĩ' => 'I', 'ĩ' => 'i',
		'Ī' => 'I', 'ī' => 'i',
		'Ĭ' => 'I', 'ĭ' => 'i',
		'Į' => 'I', 'į' => 'i',
		'İ' => 'I', 'ı' => 'i',
		'IJ' => 'IJ','ij' => 'ij',
		'Ĵ' => 'J', 'ĵ' => 'j',
		'Ķ' => 'K', 'ķ' => 'k',
		'ĸ' => 'k', 'Ĺ' => 'L',
		'ĺ' => 'l', 'Ļ' => 'L',
		'ļ' => 'l', 'Ľ' => 'L',
		'ľ' => 'l', 'Ŀ' => 'L',
		'ŀ' => 'l', 'Ł' => 'L',
		'ł' => 'l', 'Ń' => 'N',
		'ń' => 'n', 'Ņ' => 'N',
		'ņ' => 'n', 'Ň' => 'N',
		'ň' => 'n', 'ʼn' => 'n',
		'Ŋ' => 'N', 'ŋ' => 'n',
		'Ō' => 'O', 'ō' => 'o',
		'Ŏ' => 'O', 'ŏ' => 'o',
		'Ő' => 'O', 'ő' => 'o',
		'Œ' => 'OE','œ' => 'oe',
		'Ŕ' => 'R','ŕ' => 'r',
		'Ŗ' => 'R','ŗ' => 'r',
		'Ř' => 'R','ř' => 'r',
		'Ś' => 'S','ś' => 's',
		'Ŝ' => 'S','ŝ' => 's',
		'Ş' => 'S','ş' => 's',
		'Š' => 'S', 'š' => 's',
		'Ţ' => 'T', 'ţ' => 't',
		'Ť' => 'T', 'ť' => 't',
		'Ŧ' => 'T', 'ŧ' => 't',
		'Ũ' => 'U', 'ũ' => 'u',
		'Ū' => 'U', 'ū' => 'u',
		'Ŭ' => 'U', 'ŭ' => 'u',
		'Ů' => 'U', 'ů' => 'u',
		'Ű' => 'U', 'ű' => 'u',
		'Ų' => 'U', 'ų' => 'u',
		'Ŵ' => 'W', 'ŵ' => 'w',
		'Ŷ' => 'Y', 'ŷ' => 'y',
		'Ÿ' => 'Y', 'Ź' => 'Z',
		'ź' => 'z', 'Ż' => 'Z',
		'ż' => 'z', 'Ž' => 'Z',
		'ž' => 'z', 'ſ' => 's',
		// Decompositions for Latin Extended-B
		'Ș' => 'S', 'ș' => 's',
		'Ț' => 'T', 'ț' => 't',
		// Euro Sign
		'€' => 'E',
		// GBP (Pound) Sign
		'£' => '',
		// Vowels with diacritic (Vietnamese)
		// unmarked
		'Ơ' => 'O', 'ơ' => 'o',
		'Ư' => 'U', 'ư' => 'u',
		// grave accent
		'Ầ' => 'A', 'ầ' => 'a',
		'Ằ' => 'A', 'ằ' => 'a',
		'Ề' => 'E', 'ề' => 'e',
		'Ồ' => 'O', 'ồ' => 'o',
		'Ờ' => 'O', 'ờ' => 'o',
		'Ừ' => 'U', 'ừ' => 'u',
		'Ỳ' => 'Y', 'ỳ' => 'y',
		// hook
		'Ả' => 'A', 'ả' => 'a',
		'Ẩ' => 'A', 'ẩ' => 'a',
		'Ẳ' => 'A', 'ẳ' => 'a',
		'Ẻ' => 'E', 'ẻ' => 'e',
		'Ể' => 'E', 'ể' => 'e',
		'Ỉ' => 'I', 'ỉ' => 'i',
		'Ỏ' => 'O', 'ỏ' => 'o',
		'Ổ' => 'O', 'ổ' => 'o',
		'Ở' => 'O', 'ở' => 'o',
		'Ủ' => 'U', 'ủ' => 'u',
		'Ử' => 'U', 'ử' => 'u',
		'Ỷ' => 'Y', 'ỷ' => 'y',
		// tilde
		'Ẫ' => 'A', 'ẫ' => 'a',
		'Ẵ' => 'A', 'ẵ' => 'a',
		'Ẽ' => 'E', 'ẽ' => 'e',
		'Ễ' => 'E', 'ễ' => 'e',
		'Ỗ' => 'O', 'ỗ' => 'o',
		'Ỡ' => 'O', 'ỡ' => 'o',
		'Ữ' => 'U', 'ữ' => 'u',
		'Ỹ' => 'Y', 'ỹ' => 'y',
		// acute accent
		'Ấ' => 'A', 'ấ' => 'a',
		'Ắ' => 'A', 'ắ' => 'a',
		'Ế' => 'E', 'ế' => 'e',
		'Ố' => 'O', 'ố' => 'o',
		'Ớ' => 'O', 'ớ' => 'o',
		'Ứ' => 'U', 'ứ' => 'u',
		// dot below
		'Ạ' => 'A', 'ạ' => 'a',
		'Ậ' => 'A', 'ậ' => 'a',
		'Ặ' => 'A', 'ặ' => 'a',
		'Ẹ' => 'E', 'ẹ' => 'e',
		'Ệ' => 'E', 'ệ' => 'e',
		'Ị' => 'I', 'ị' => 'i',
		'Ọ' => 'O', 'ọ' => 'o',
		'Ộ' => 'O', 'ộ' => 'o',
		'Ợ' => 'O', 'ợ' => 'o',
		'Ụ' => 'U', 'ụ' => 'u',
		'Ự' => 'U', 'ự' => 'u',
		'Ỵ' => 'Y', 'ỵ' => 'y',
		// Vowels with diacritic (Chinese, Hanyu Pinyin)
		'ɑ' => 'a',
		// macron
		'Ǖ' => 'U', 'ǖ' => 'u',
		// acute accent
		'Ǘ' => 'U', 'ǘ' => 'u',
		// caron
		'Ǎ' => 'A', 'ǎ' => 'a',
		'Ǐ' => 'I', 'ǐ' => 'i',
		'Ǒ' => 'O', 'ǒ' => 'o',
		'Ǔ' => 'U', 'ǔ' => 'u',
		'Ǚ' => 'U', 'ǚ' => 'u',
		// grave accent
		'Ǜ' => 'U', 'ǜ' => 'u',
		);

		// Used for locale-specific rules
		$locale = get_locale();

		if ( 'de_DE' == $locale || 'de_DE_formal' == $locale || 'de_CH' == $locale || 'de_CH_informal' == $locale ) {
			$chars[ 'Ä' ] = 'Ae';
			$chars[ 'ä' ] = 'ae';
			$chars[ 'Ö' ] = 'Oe';
			$chars[ 'ö' ] = 'oe';
			$chars[ 'Ü' ] = 'Ue';
			$chars[ 'ü' ] = 'ue';
			$chars[ 'ß' ] = 'ss';
		} elseif ( 'da_DK' === $locale ) {
			$chars[ 'Æ' ] = 'Ae';
 			$chars[ 'æ' ] = 'ae';
			$chars[ 'Ø' ] = 'Oe';
			$chars[ 'ø' ] = 'oe';
			$chars[ 'Å' ] = 'Aa';
			$chars[ 'å' ] = 'aa';
		} elseif ( 'ca' === $locale ) {
			$chars[ 'l·l' ] = 'll';
		} elseif ( 'sr_RS' === $locale || 'bs_BA' === $locale ) {
			$chars[ 'Đ' ] = 'DJ';
			$chars[ 'đ' ] = 'dj';
		}

		$string = strtr($string, $chars);
	} else {
		$chars = array();
		// Assume ISO-8859-1 if not UTF-8
		$chars['in'] = "\x80\x83\x8a\x8e\x9a\x9e"
			."\x9f\xa2\xa5\xb5\xc0\xc1\xc2"
			."\xc3\xc4\xc5\xc7\xc8\xc9\xca"
			."\xcb\xcc\xcd\xce\xcf\xd1\xd2"
			."\xd3\xd4\xd5\xd6\xd8\xd9\xda"
			."\xdb\xdc\xdd\xe0\xe1\xe2\xe3"
			."\xe4\xe5\xe7\xe8\xe9\xea\xeb"
			."\xec\xed\xee\xef\xf1\xf2\xf3"
			."\xf4\xf5\xf6\xf8\xf9\xfa\xfb"
			."\xfc\xfd\xff";

		$chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy";

		$string = strtr($string, $chars['in'], $chars['out']);
		$double_chars = array();
		$double_chars['in'] = array("\x8c", "\x9c", "\xc6", "\xd0", "\xde", "\xdf", "\xe6", "\xf0", "\xfe");
		$double_chars['out'] = array('OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th');
		$string = str_replace($double_chars['in'], $double_chars['out'], $string);
	}

	return $string;
}