Currency Conversion using PHP [closed]

Answer 1

I used the following PHP to pull data from the ECB as Stefan Gehrig suggested.

<?php
try {
    $xml_string = file_get_contents("https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml");
    $xml = new SimpleXMLElement($xml_string);
    $cxml = $xml->xpath('//*[@currency]');
    //anchored to USD in this case
    $usx = $xml->xpath('//*[@currency="USD"]');
    $base = floatval(strval($usx[0]['rate']));
    //create a simple associative array with the 3-letter code
    //as the key and the rate as the value
    $c_arr = array();
    foreach ($cxml as $c) {
        $cur = strval($c['currency']);
        $rate = floatval(strval($c['rate']))/$base;
        $c_arr[$cur] = $rate;
    }
    //add the euro since it's assumed as the base rate for the ECB
    $c_arr['EUR'] = 1/$base;
    $currency_json = json_encode($c_arr);

    //write to file
    $file = "currency.json";
    $fh = fopen($file, 'w') or die("can't open file");
    fwrite($fh, $currency_json);
    fclose($fh);
    echo $currency_json;
} catch (Exception $e) { echo $e; }
?>

It writes a JSON file that I include as a JavaScript variable:

<script type="text/javascript">
var data = <?php include('currency.json'); ?>;
</script>

I can then easy grab the data using the 3-letter currency code (e.g., data['GBP']) with JavaScript when a currency change is requested.

I use a Cron Job to update the JSON once a day, so it's not making a call each time the page is visited.

Answer 2

use this simple function :

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

Answer 3

<?php
//  replace this key from  fixer.io after getting  a free API access key:

$API = '314259bbe6de76b961c84a5244ac0fc0';

function convertCurrency($API, $amount, $from = 'EUR', $to = 'USD'){
  $curl = file_get_contents("http://data.fixer.io/api/latest?access_key=$API&symbols=$from,$to");

  if($curl)
  {
    $arr = json_decode($curl,true);
    if($arr['success'])
    {
        $from = $arr['rates'][$from];
        $to = $arr['rates'][$to];

        $rate = $to / $from;
        $result = round($amount * $rate, 6);
        return $result;
    }else{
        echo $arr['error']['info'];
    }
  }else{
    echo "Error reaching api";
  }
}

echo convertCurrency($API, 1, 'USD', 'EGP');