State.php

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<?php
/* Copyright (c) 2018 - Richard Klees <richard.klees@concepts-and-training.de> - Extended GPL, see LICENSE */

namespace ILIAS\KioskMode;

class State
{

    protected $store;

    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);
    }
}