<?php

namespace MyApp\Helpers;

function calculateSum(int $a, int $b): int {
    return $a + $b;
}

/**
 * @deprecated Use formatUserName() instead
 */
function getUserName(string $firstName, string $lastName): string {
    return $firstName . ' ' . $lastName;
}

function validateEmail(string $email): bool {
    return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}

function processData(array $data, ?string $format = null): array|string|null {
    if ($format === 'json') {
        return json_encode($data);
    }
    return $data;
}
