Currency Converter from google free of cost

public function convertCurrency()
    {
        $amounts = 597;
        $from_currency='USD';
        $to_currency='INR';
        $url = 'https://www.google.co.za/search?q='.$amounts.'+' . $from_currency . '+to+' . $to_currency;

        $cSession = curl_init();

        curl_setopt($cSession, CURLOPT_URL, $url);
        curl_setopt($cSession, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($cSession, CURLOPT_SSL_VERIFYPEER, true);

        $buffer = curl_exec($cSession);
        curl_close($cSession);

        preg_match("/<div class=\"J7UKTe\">(.*)<\/div>/",$buffer, $matches);
        $matches = preg_replace("/[^0-9.]/", "", $matches[1]);
        $amount =  round($matches, 2);
        $total = substr($amount, mb_strlen($amounts));
        return number_format($total,2);
    }