Currency Conversion

Currency change without using any Drupal commerce module

<?php
error_reporting(E_ALL ^ E_NOTICE);
/**
** Implementation of hook_permission().
**/
function currencycode_permission() {
// Restrict access to either of your new URLs.
return array(
'access currencycode' => array(
'title' => t('access currencycode'),
'description' => t('Allow users to access currencycode'),
),
);
}

/****
** hook_block_info()
****/
function currencycode_block_info() {
$blocks['executive_sidebar'] = array(
'info' => t('curr del'),
);

return $blocks;
}

/****
** hook_block_view()
****/
function currencycode_block_view($delta) {
$blocks = array();
//delta is your block name. then just set it equal to your return functions.
switch ($delta) {
case 'executive_sidebar':
$blocks['subject'] = '';
$blocks['content'] = drupal_get_form('currency_form');
break;
}
return $blocks;
}

function currency($from_Currency,$to_Currency,$amount) {
$amount = urlencode($amount);
$from_Currency = urlencode($from_Currency);
$to_Currency = urlencode($to_Currency);
$url = "http://www.google.com/ig/calculator?hl=en&q=$amount$from_Currency=?$to_Currency";
$ch = curl_init();
$timeout = 0;
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT , "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$rawdata = curl_exec($ch);
curl_close($ch);
$data = explode('"', $rawdata);
$data = explode(' ', $data['3']);
$var = $data['0'];
return round($var,3);
}

/***this.form.submit();'#default_value' => '4',
* function to
***/

function currency_form() {
$geoPlugin_array = unserialize( file_get_contents('http://www.geoplugin.net/php.gp?ip=' . $_SERVER['REMOTE_ADDR']) );
$curr=$geoPlugin_array['geoplugin_currencyCode'];
//echo "

"; 
 //print_r(currency_optionsto());

    //$form = array();
    $form['category1'] = array(
        '#type' => 'select',
        '#title' => t(''),
        '#options' => currency_optionsto(),
  '#attributes' => array('onchange' => 'this.form.submit();'),
  '#id' => 'jay'
    );
     $form['location'] = array(
        '#type' => 'hidden',
        '#size' => 40,
  '#value' =>$_SESSION['loc'],
  
    );
   $form['#action'] ='';
 $TO=$_POST['category1'];

//echo currency("USD",$TO,1);
      return $form;
    }
 /*function currency_form_submit($form, &$form_state) {
 echo "dsdfg";
 print_r($form_state);
 exit;
 }*/
function currency_optionsto(){
    $options = array();
    
    $options =Array
   (
 'ARS' => t('ARS'),
 'AUD' => t('AUD'),
 'BRL' => t('BRL'),
 
  'CHF' => t('CAD'),
 'CNY' => t('CNY'),
 'CZK' => t('CZK'),
  'DKK' => t('DKK'),
 'EUR' => t('EUR'),
 'GBP' => t('GBP'),
  'HKD' => t('HKD'),
 'HUF' => t('HUF'),
 'IDR' => t('IDR'),
  'ILS' => t('ILS'),
 'INR' => t('INR'),
 'JPY' => t('JPY'),
  'KRW' => t('KRW'),
 'MYR' => t('MYR'),
 'MXN' => t('MXN'),
  'NOK' => t('NOK'),
 'NZD' => t('NZD'),
 'PHP' => t('PHP'),
  'PLN' => t('PLN'),
 'RUB' => t('RUB'),
 'SEK' => t('SEK'),
  'SGD' => t('SGD'),
 'THB' => t('THB'),
 'TRY' => t('TRY'),
  'TWD' => t('TWD'),
 'AUD' => t('AUD'),
 'BRL' => t('BRL'),
  'USD' => t('USD'),
 'VND' => t('VND'),
 'ZAR' => t('ZAR'),
 );
    
    return $options;
}