<?php
declare(strict_types=1);

final class Http
{
    public static function method(): string
    {
        return strtoupper((string)($_SERVER['REQUEST_METHOD'] ?? 'GET'));
    }

    public static function isPost(): bool
    {
        return self::method() === 'POST';
    }

    /**
     * @param array<string,mixed> $source
     */
    public static function getString(array $source, string $key, string $default = ''): string
    {
        $value = $source[$key] ?? $default;
        return is_scalar($value) ? trim((string)$value) : $default;
    }

    public static function redirect(string $url): void
    {
        header('Location: ' . $url, true, 302);
        exit;
    }
}