<?php
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
class SampleArrayAccess implements ArrayAccess
{
    private $container;

    public function __construct()
    {
        $this->container = [];
    }

    public function offsetSet($offset, $value): void
    {
        if (\is_null($offset)) {
            $this->container[] = $value;
        } else {
            $this->container[$offset] = $value;
        }
    }

    public function offsetExists($offset)
    {
        return isset($this->container[$offset]);
    }

    public function offsetUnset($offset): void
    {
        unset($this->container[$offset]);
    }

    public function offsetGet($offset)
    {
        return $this->container[$offset] ?? null;
    }
}
