vendor/symfony/http-foundation/Session/Storage/Handler/AbstractSessionHandler.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\Handler;

use Symfony\Component\HttpFoundation\Session\SessionUtils;

/**
 * This abstract session handler provides a generic implementation
 * of the PHP 7.0 SessionUpdateTimestampHandlerInterface,
 * enabling strict and lazy session handling.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
abstract class AbstractSessionHandler implements \SessionHandlerInterface, \SessionUpdateTimestampHandlerInterface
{
    private $sessionName;
    private $prefetchId;
    private $prefetchData;
    private $newSessionId;
    private $igbinaryEmptyData;

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function open($savePath, $sessionName)
    {
        $this->sessionName = $sessionName;
        if (!headers_sent() && !\ini_get('session.cache_limiter') && '0' !== \ini_get('session.cache_limiter')) {
            header(sprintf('Cache-Control: max-age=%d, private, must-revalidate', 60 * (int) \ini_get('session.cache_expire')));
        }

        return true;
    }

    /**
     * @return string
     */
    abstract protected function doRead(string $sessionId);

    /**
     * @return bool
     */
    abstract protected function doWrite(string $sessionId, string $data);

    /**
     * @return bool
     */
    abstract protected function doDestroy(string $sessionId);

    /**