function to_unicode($string) {
$str = mb_convert_encoding($string, 'UCS-2', 'UTF-8');
$arrstr = str_split($str, 2);
$unistr = '';
foreach ($arrstr as $n) {
$dec = hexdec(bin2hex($n));
$unistr .= '&#' . $dec . ';';
}
return $unistr;