price function global (needs review)

app/Support/Price.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Support;
+
+class Price
+{
+    /**
+     * Format a price the Greek way: comma as the decimal separator, dot as
+     * the thousands separator, and no decimals shown unless the amount
+     * actually needs them (19.00 -> "19", 19.50 -> "19,5", 19.55 -> "19,55").
+     */
+    public static function format(float|int|string|null $amount, string $currency = '€'): ?string
+    {
+        if ($amount === null) {
+            return null;
+        }
+
+        $amount = round((float) $amount, 2);
+        $cents = (int) round($amount * 100);
+
+        $decimals = match (true) {
+            $cents % 100 === 0 => 0,
+            $cents % 10 === 0 => 1,
+            default => 2,
+        };
+
+        return $currency.number_format($amount, $decimals, ',', '.');
+    }
+}