vendor/symfony/http-foundation/Session/Session.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation\Session;

use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBagInterface;
use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;

// Help opcache.preload discover always-needed symbols
class_exists(AttributeBag::class);
class_exists(FlashBag::class);
class_exists(SessionBagProxy::class);

/**
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Drak <drak@zikula.org>
 *
 * @implements \IteratorAggregate<string, mixed>
 */
class Session implements SessionInterface, \IteratorAggregate, \Countable
{
    protected $storage;

    private $flashName;
    private $attributeName;
    private $data = [];
    private $usageIndex = 0;
    private $usageReporter;

    public function __construct(SessionStorageInterface $storage = null, AttributeBagInterface $attributes = null, FlashBagInterface $flashes = null, callable $usageReporter = null)
    {
        $this->storage = $storage ?? new NativeSessionStorage();
        $this->usageReporter = $usageReporter;

        $attributes = $attributes ?? new AttributeBag();
        $this->attributeName = $attributes->getName();
        $this->registerBag($attributes);

        $flashes = $flashes ?? new FlashBag();
        $this->flashName = $flashes->getName();
        $this->registerBag($flashes);
    }

    /**
     * {@inheritdoc}
     */
    public function start()
    {