This Script Show the current value of rupees in dollar.It is work on google API, the url of the google API calculater is
http://www.google.com/ig/calculator?hl=en&q=1USD=?INR

Via this URL you can convert all the currency into another currency

Now this is the Full script of retrieving the current value of the dollar in rupees
$s = file_get_contents("http://www.google.com/ig/calculator?hl=en&q=1USD=?INR");
$s=explode('{lhs: "1 U.S. dollar",rhs: "',$s);
$s=explode('Indian rupees",error: "",icc: true}',$s[1]);
$s=(FLOAT)$s[0];
echo "1 USD = ".round($s,2)." INR"
?>