php:zf2 multi-currency implementation - php

Question

I am new to zf2. In my current website I need to implement multi-currency selection. What I have done is created a .global file in the application module and added the below list
return array(
'currency' =>array(
'default_currency'=>'GBP',
'currency_list'=> array(
'GBP'=>'UK(£)',
'USD'=>'USA($)',
'EUR'=>'EU Euro(€)',
'HKD'=>'HK Dollar(HKD)',
'CHF'=>'Swiss Franc(CHF)',
'JPY'=>'Japan Yen(¥)',
'SGD'=>'Sing Dollar(SGD)'
)
)
);
This is above list will show in my menu bar. What is need is when the user selects the currency the website must set that currency as the default currency for the entire website.
I do this in the bootstrap function of the Module.php but it does not work correctly.
$eventManager->attach('route', function ($event) {
$sm = $event->getApplication()->getServiceManager();
$config = $event->getApplication()->getServiceManager()->get('Configuration');
// locale language
$localesConfig = $config['locales'];
$locales = $localesConfig['lang_list'];
$locale = $event->getRouteMatch()->getParam('locale');
$localeCurrencyConfig = $config['currency'];
$localesCurrency = $localeCurrencyConfig['currency_list'];
$localeCurrency = $event->getRouteMatch()->getParam('curr');
// unsupported lacale provided default to en
if (!in_array($locale, array_keys($locales)))
$locale = $localesConfig['default_lang'];
// unsupported currency provided default to GBP
if (!in_array($localeCurrency, array_keys($localesCurrency)))
$localeCurrency = $localeCurrencyConfig['default_currency'];
// If there is no locale parameter in the route, switch to default locale en
if (empty($locale))
$locale = $localesConfig['default_lang'];
if (empty($localeCurrency))
$localeCurrency = $localeCurrencyConfig['default_currency'];
$translator = $sm->get('translator');
$translator->setLocale($locale);
$viewHelperManager = $sm->get('ViewHelperManager');
$viewHelperManager->get("currencyFormat")->setCurrencyCode($localeCurrency);
}, -10);

Answer 1

// Fetching JSON
$req_url = 'https://v6.exchangerate-api.com/v6/API_KEY/latest/USD';
$response_json = file_get_contents($req_url);
print_r($response_json);
// Continuing if we got a result
if(false !== $response_json) {
// Try/catch for json_decode operation
try {
// Decoding
$response = json_decode($response_json);
// Check for success
if('success' === $response->result) {
// YOUR APPLICATION CODE HERE, e.g.
$base_price = 10; // Your price in USD
$EUR_price = round(($base_price * $response->conversion_rates->AUD), 2);
echo"\n\n".$EUR_price;
}
}
catch(Exception $e) {
// Handle JSON parse error...
}
}