vendor/symfony/http-foundation/Session/Storage/MetadataBag.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\Storage;

use Symfony\Component\HttpFoundation\Session\SessionBagInterface;

/**
 * Metadata container.
 *
 * Adds metadata to the session.
 *
 * @author Drak <drak@zikula.org>
 */
class MetadataBag implements SessionBagInterface
{
    public const CREATED = 'c';
    public const UPDATED = 'u';
    public const LIFETIME = 'l';

    /**
     * @var string
     */
    private $name = '__metadata';

    /**
     * @var string
     */
    private $storageKey;

    /**
     * @var array
     */
    protected $meta = [self::CREATED => 0, self::UPDATED => 0, self::LIFETIME => 0];

    /**
     * Unix timestamp.
     *
     * @var int
     */
    private $lastUsed;

    /**
     * @var int
     */
    private $updateThreshold;

    /**
     * @param string $storageKey      The key used to store bag in the session
     * @param int    $updateThreshold The time to wait between two UPDATED updates
     */
    public function __construct(string $storageKey = '_sf2_meta', int $updateThreshold = 0)