Use Google finance calculator to convert currency with php

gistfile1.php

<?php
function convertCurrency($amount, $from, $to){
	$data = file_get_contents("https://www.google.com/finance/converter?a=$amount&from=$from&to=$to");
	preg_match("/<span class=bld>(.*)<\/span>/",$data, $converted);
	$converted = preg_replace("/[^0-9.]/", "", $converted[1]);
	return number_format(round($converted, 3),2);
}

echo convertCurrency("10.00", "GBP", "USD");