vendor/symfony/http-foundation/Session/Flash/AutoExpireFlashBag.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\Flash;

/**
 * AutoExpireFlashBag flash message container.
 *
 * @author Drak <drak@zikula.org>
 */
class AutoExpireFlashBag implements FlashBagInterface
{
    private $name = 'flashes';
    private $flashes = ['display' => [], 'new' => []];
    private $storageKey;

    /**
     * @param string $storageKey The key used to store flashes in the session
     */
    public function __construct(string $storageKey = '_symfony_flashes')
    {
        $this->storageKey = $storageKey;
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return $this->name;
    }

    public function setName(string $name)
    {
        $this->name = $name;
    }

    /**
     * {@inheritdoc}
     */
    public function initialize(array &$flashes)
    {
        $this->flashes = &$flashes;

        // The logic: messages from the last request will be stored in new, so we move them to previous
        // This request we will show what is in 'display'.  What is placed into 'new' this time round will
        // be moved to display next time round.
        $this->flashes['display'] = \array_key_exists('new', $this->flashes) ? $this->flashes['new'] : [];
        $this->flashes['new'] = [];
    }

    /**