Format currency in users locale

includes/currency_formatter.php

@@ -0,0 +1,20 @@
+<?php
+
+final class CurrencyFormatter
+{
+    private static $instance;
+
+    private static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new NumberFormatter(Locale::acceptFromHttp($_SERVER['HTTP_ACCEPT_LANGUAGE']), NumberFormatter::CURRENCY);
+        }
+
+        return self::$instance;
+    }
+
+    public static function format($amount, $currency)
+    {
+        return self::getInstance()->formatCurrency($amount, $currency);
+    }
+}