Currency convertor with PHP

function currency_convert($amount, $from, $to){
	$result = file_get_contents("https://www.google.com/finance/converter?a=$amount&from=$from&to=$to");
	$result = explode("",$result);
	$result = explode("",$result[1]);  
	$converted_amount = preg_replace("/[^0-9\.]/", null, $result[0]);
	echo $converted_amount;
}

currency_convert(1,'gbp','usd');