// Created on savesnippets.com · https://savesnippets.com/jcK7gx2dPVQahv
<?php
function formatMoney(int $cents, string $currency = 'USD', string $locale = 'en_US'): string {
    if (class_exists(NumberFormatter::class)) {
        $f = new NumberFormatter($locale, NumberFormatter::CURRENCY);
        return $f->formatCurrency($cents / 100, $currency);
    }
    return number_format($cents / 100, 2) . ' ' . $currency;
}

echo formatMoney(199, 'USD');                    // $1.99
echo formatMoney(1599, 'EUR', 'de_DE');          // 15,99 €
echo formatMoney(50000, 'JPY', 'ja_JP');         // ￥500 (JPY has no minor unit)