Php: currency conversion using APIs

<?php
$amount=15;
$from_Currency= 'USD';
$to_Currency= 'AUD';
$amount = urlencode($amount);
$from_Currency = urlencode($from_Currency);
$to_Currency = urlencode($to_Currency);

$url = "http://www.google.com/finance/converter?a=$amount&from=$from_Currency&to=$to_Currency";

$ch = curl_init();
$timeout = 0;
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$rawdata = curl_exec($ch);
curl_close($ch);
$data = explode('bld>', $rawdata);
$data = explode($to_Currency, $data[1]);
echo round($data[0], 2);
?>