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");

    $result = explode("<span class=bld>",$result);

    $result = explode("</span>",$result[1]);  

    $converted_amount = preg_replace("/[^0-9\.]/", null, $result[0]);

    echo $converted_amount;

}

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