Cacher is the code snippet organizer for pro developers

/**
 * @param $currency_from ,$currency_to,$currency_input
 * @return mixed|float
 */
function currencyConverter($currency_from, $currency_to, $currency_input)
{
    $yql_base_url = "http://query.yahooapis.com/v1/public/yql";
    $yql_query = 'select * from yahoo.finance.xchange where pair in ("' . $currency_from . $currency_to . '")';
    $yql_query_url = $yql_base_url . "?q=" . urlencode($yql_query);
    $yql_query_url .= "&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
    $yql_session = file_get_contents($yql_query_url);
    $yql_json = json_decode($yql_session, true);
    $currency_output = (float)$currency_input * $yql_json['query']['results']['rate']['Rate'];
    return $currency_output;
}