firefly-iii/app/Support/NullArrayObject.php

<?php

/**
 * NullArrayObject.php
 * Copyright (c) 2019 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Support;

/**
 * Class NullArrayObject
 */
class NullArrayObject extends \ArrayObject
{
    /** @var null|mixed */
    public $default;

    /**
     * NullArrayObject constructor.
     *
     * @param null $default
     */
    /** @phpstan-ignore-next-line */
    public function __construct(array $array, $default = null)
    {
        parent::__construct($array);
        $this->default = $default;
    }

    /**
     * @param mixed $key
     */
    public function offsetGet($key): mixed
    {
        if ($this->offsetExists($key)) {
            return parent::offsetGet($key);
        }

        return null;
    }
}