MVC Configuration classes

ConfigInterface.php

<?php

declare(strict_types=1);

namespace Eventjet\Config;

interface ConfigInterface
{
    public function string(string $key): string;

    public function int(string $key): int;

    public function float(string $key): float;

    public function bool(string $key): bool;

    public function array(string $key): array;

    public function has(string $key): bool;
}

NestedArrayConfig.php

<?php

declare(strict_types=1);

namespace Eventjet\Config;

use Eventjet\Config\Exception\UnknownKeyException;

use function explode;

final class NestedArrayConfig implements ConfigInterface
{
    public const DELIMITER = '/';
    /** @var array<string, mixed> */
    private array $config;

    public function __construct(array $config)
    {
        $this->config = $config;
    }

    public function string(string $key): string
    {
        return $this->get($key);
    }

    public function int(string $key): int
    {
        return $this->get($key);
    }

    public function float(string $key): float
    {
        return $this->get($key);
    }

    public function bool(string $key): bool
    {
        return $this->get($key);
    }

    public function array(string $key): array
    {
        return $this->get($key);
    }

    public function has(string $key): bool
    {
        return $this->softGet($key) !== null;
    }

    /**
     * @return mixed
     * @throws UnknownKeyException
     */
    private function get(string $key)
    {
        $value = $this->softGet($key);
        if ($value === null) {
            throw UnknownKeyException::fromKey($key);
        }
        return $value;
    }

    /**
     * @return string|int|float|bool|array<array-key, mixed>|null
     */
    private function softGet(string $key)
    {
        $paths = explode(self::DELIMITER, $key);
        $current = $this->config;
        foreach ($paths as $index) {
            if (!isset($current[$index])) {
                return null;
            }
            $current = $current[$index];
        }
        return $current;
    }
}

NestedArrayConfigFactory.php

<?php

declare(strict_types=1);

namespace Eventjet\Config;

use Psr\Container\ContainerInterface;

class NestedArrayConfigFactory
{
    public function __invoke(ContainerInterface $container): NestedArrayConfig
    {
        return new NestedArrayConfig($container->get('config'));
    }
}