how to make currency exchange rates in jquery php

  Google Finance Currency Converter

<?php
    $from_currency    = 'USD';
    $to_currency    = 'INR';
    $amount            = 1;
    $results = converCurrency($from_currency,$to_currency,$amount);
    $regularExpression     = '#\<span class=bld\>(.+?)\<\/span\>#s';
    preg_match($regularExpression, $results, $finalData);
    echo $finalData[0];

 function converCurrency($from,$to,$amount){
 $url = "http://www.google.com/finance/converter?a=$amount&from=$from&to=$to";
 $request = curl_init();
 $timeOut = 0;
 curl_setopt ($request, CURLOPT_URL, $url);
 curl_setopt ($request, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt ($request, CURLOPT_USERAGENT,"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
 curl_setopt ($request, CURLOPT_CONNECTTIMEOUT, $timeOut);
 $response = curl_exec($request);
 curl_close($request);
 return $response;
 }
?>

Is-there-an-API-for-real-time-currency-conversion