State.php

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<?php

declare(strict_types=1);

namespace ILIAS\KioskMode;

class State
{
    protected ?array $store = null;

    public function withValueFor(string $key, string $value): State
    {
        $clone = clone $this;
        $clone->store[$key] = $value;
        return $clone;
    }

    public function withoutKey(string $key): State
    {
        $clone = clone $this;
        unset($clone->store[$key]);
        return $clone;
    }

    public function getValueFor(string $key): ?string
    {
        if (!$this->store) {
            return null;
        }
        return $this->store[$key];
    }

    public function serialize(): string
    {
        return json_encode($this->store, JSON_THROW_ON_ERROR);
    }
}