Emm… mungkin temen2 suatu saat butuh fitur konversi mata uang ini ketika develop Aplikasi dengan CodeIgniter. Misalnya saja ketika kita mau bikin toko online yang mana harga product nya dapat ditampilkan dengan beberapa mata uang sebagai contoh IDR (rupiah) dan USD (dolar).
Untuk fitur konversi mata uang ini aku mengunakan library yang dibuat oleh Simon Jarvis yang bisa didapatkan source nya di http://www.white-hat-web-design.co.uk/articles/php-currency-conversion.php . Kurs mata uangnya up to date , dan tidak ribet implementasinya. Oleh penulisnya emang dibuat untuk PHP secara umum…, tetapi kita juga bisa memakainya untuk aplikasi yang kita buat dengan framework CodeIgniter. Aku akan coba tuliskan bebrapa langkah untuk memakai library ini. Untuk yang belum pernah install framework CodeIgniter bisa baca artikel aku sebelumnya tentang Instalasi Framwork CodeIgniter.
Pertama kita buat file CurrencyConverter.php di dalam folder application/libraries. Kemudian kita kopikan kode program yang dibuat oleh Simon Jarvis sperti dibawah.
Currency Converter.php
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/*
* File: CurrencyConverter.php
* Author: Simon Jarvis
* Copyright: 2005 Simon Jarvis
* Date: 10/12/05
* Link: http://www.white-hat-web-design.co.uk/articles/php-currency-conversion.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/
class CurrencyConverter {
var $xml_file = "www.ecb.int/stats/eurofxref/eurofxref-daily.xml";
var $mysql_host, $mysql_user, $mysql_pass, $mysql_db, $mysql_table;
var $exchange_rates = array();
//Load Currency Rates
function CurrencyConverter() {
$this->mysql_host = "localhost";
$this->mysql_user = "root";
$this->mysql_pass = "";
$this->mysql_db = "cocomomodb";
$this->mysql_table = "ob_currencies";
$this->checkLastUpdated();
$conn = mysql_connect($this->mysql_host,
$this->mysql_user,$this->mysql_pass);
$rs = mysql_select_db($this->mysql_db,$conn);
$sql = "SELECT * FROM ".$this->mysql_table;
$rs = mysql_query($sql,$conn);
while($row = mysql_fetch_array($rs)) {
$this->exchange_rates[$row['currency']] = $row['rate'];
}
}
/* Perform the actual conversion, defaults to £1.00 GBP to USD */
function convert($amount=1,$from="GBP",$to="USD",$decimals=2) {
return(number_format(($amount/$this->exchange_rates[$from])*
$this->exchange_rates[$to],$decimals));
}
/* Check to see how long since the data was last updated */
function checkLastUpdated() {
$conn = mysql_connect($this->mysql_host,
$this->mysql_user,$this->mysql_pass);
$rs = mysql_select_db($this->mysql_db,$conn);
$sql = "SHOW TABLE STATUS FROM ".$this->mysql_db." LIKE '".$this->mysql_table."'";
$rs = mysql_query($sql,$conn);
if(mysql_num_rows($rs) == 0 ) {
$this->createTable();
} else {
$row = mysql_fetch_array($rs);
if(time() > (strtotime($row["Update_time"])+(12*60*60)) ) {
$this->downloadExchangeRates();
}
}
}
/* Download xml file, extract exchange rates and store values in database */
function downloadExchangeRates() {
$currency_domain = substr($this->xml_file,0,strpos($this->xml_file,"/"));
$currency_file = substr($this->xml_file,strpos($this->xml_file,"/"));
$fp = @fsockopen($currency_domain, 80, $errno, $errstr, 10);
if($fp) {
$out = "GET ".$currency_file." HTTP/1.1\r\n";
$out .= "Host: ".$currency_domain."\r\n";
$out .= "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
while (!feof($fp)) {
$buffer .= fgets($fp, 128);
}
fclose($fp);
$pattern = "{<Cube\s*currency='(\w*)'\s*rate='([\d\.]*)'/>}is";
preg_match_all($pattern,$buffer,$xml_rates);
array_shift($xml_rates);
for($i=0;$i<count($xml_rates[0]);$i++) {
$exchange_rate[$xml_rates[0][$i]] = $xml_rates[1][$i];
}
$conn = mysql_connect($this->mysql_host,$this->mysql_user,$this->mysql_pass);
$rs = mysql_select_db($this->mysql_db,$conn);
foreach($exchange_rate as $currency=>$rate) {
if((is_numeric($rate)) && ($rate != 0)) {
$sql = "SELECT * FROM ".$this->mysql_table." WHERE currency='".$currency."'";
$rs = mysql_query($sql,$conn) or die(mysql_error());
if(mysql_num_rows($rs) > 0) {
$sql = "UPDATE ".$this->mysql_table." SET rate=".$rate." WHERE currency='".$currency."'";
} else {
$sql = "INSERT INTO ".$this->mysql_table." VALUES('".$currency."',".$rate.")";
}
$rs = mysql_query($sql,$conn) or die(mysql_error());
}
}
}
}
/* Create the currency exchange table */
function createTable() {
$conn = mysql_connect($this->mysql_host,$this->mysql_user,$this->mysql_pass);
$rs = mysql_select_db($this->mysql_db,$conn);
$sql = "CREATE TABLE ".$this->mysql_table." ( currency char(3) NOT NULL default '', rate float NOT NULL default '0', PRIMARY KEY(currency) ) ENGINE=MyISAM";
$rs = mysql_query($sql,$conn) or die(mysql_error());
$sql = "INSERT INTO ".$this->mysql_table." VALUES('EUR',1)";
$rs = mysql_query($sql,$conn) or die(mysql_error());
$this->downloadExchangeRates();
}
}
?>
Pastikan konfigurasi database Anda benar. Misal konfigurasi databaseku sperti ini:
$this->mysql_host = "localhost"; $this->mysql_user = "root"; $this->mysql_pass = ""; $this->mysql_db = "cocomomodb"; $this->mysql_table = "ob_currencies";
Kedua,, kita setting agar library CurrencyConverter tersebut diload secara otomatis. Kita bisa melakukan setting autoload untuk library ini pada file autoload.php di application/config/autoload.php. pada baris berikut:
autoload['libraries'] = array('database', 'session', 'form_validation', 'validation', 'system_library', 'CurrencyConverter');
Setelah itu kita bisa melakukan pemanggilan seperti berikut.
<?php $x = new CurrencyConverter(); echo $x->convert(1000000, "IDR", "USD"); ?>
Okey….gitu aja. Selamat mencoba…..semoga bermanfaat…hehehe
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