PHP – Google Currency Converter

PHP – Google Currency Converter

<?php 
function currency_convert($from,$to,$amount) {
   $string = "1".$from."=?".$to;
   $google_url = "http://www.google.com/ig/calculator?hl=en&q=".$string;
   $result = file_get_contents($google_url);
   $result = explode('"', $result);
   $converted_amount = explode(' ', $result[3]);
   $conversion = $converted_amount[0];
   $conversion = $conversion * $amount;
   $conversion = round($conversion, 2);
   $rhs_text = ucwords(str_replace($converted_amount[0],"",$result[3]));
   $rhs = $conversion.$rhs_text;
   $price = preg_replace('_^\D+|\D+$_', "", $rhs);
   return number_format($price, 2, '.', ',');
}
echo currency_convert('GBP', 'USD',250.75); # convert 250.75 USD into equivalent GBP
?>

not working