php获取实时汇率

function getExchangeRate($from_Currency,$to_Currency,$amount){
$from_Currency = urlencode($from_Currency);
$to_Currency = urlencode($to_Currency);
$url = "download.finance.yahoo.com/d/quotes.html?s=".$from_Currency.$to_Currency."=X&f=sl1d1t1ba&e=.html";
$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(',', $rawdata);
$pay_amount=round($data[1]*$amount,2);
return $pay_amount;
}
echo getExchangeRate("CNY","USD","3499");