<form method="POST">
    <h3>Editing: MigratingSessionHandler.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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;

/**
 * Migrating session handler for migrating from one handler to another. It reads
 * from the current handler and writes both the current and new ones.
 *
 * It ignores errors from the new handler.
 *
 * @author Ross Motley &lt;ross.motley@amara.com&gt;
 * @author Oliver Radwell &lt;oliver.radwell@amara.com&gt;
 */
class MigratingSessionHandler implements \SessionHandlerInterface, \SessionUpdateTimestampHandlerInterface
{
    /**
     * @var \SessionHandlerInterface&amp;\SessionUpdateTimestampHandlerInterface
     */
    private $currentHandler;

    /**
     * @var \SessionHandlerInterface&amp;\SessionUpdateTimestampHandlerInterface
     */
    private $writeOnlyHandler;

    public function __construct(\SessionHandlerInterface $currentHandler, \SessionHandlerInterface $writeOnlyHandler)
    {
        if (!$currentHandler instanceof \SessionUpdateTimestampHandlerInterface) {
            $currentHandler = new StrictSessionHandler($currentHandler);
        }
        if (!$writeOnlyHandler instanceof \SessionUpdateTimestampHandlerInterface) {
            $writeOnlyHandler = new StrictSessionHandler($writeOnlyHandler);
        }

        $this-&gt;currentHandler = $currentHandler;
        $this-&gt;writeOnlyHandler = $writeOnlyHandler;
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function close()
    {
        $result = $this-&gt;currentHandler-&gt;close();
        $this-&gt;writeOnlyHandler-&gt;close();

        return $result;
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function destroy($sessionId)
    {
        $result = $this-&gt;currentHandler-&gt;destroy($sessionId);
        $this-&gt;writeOnlyHandler-&gt;destroy($sessionId);

        return $result;
    }

    /**
     * @return int|false
     */
    #[\ReturnTypeWillChange]
    public function gc($maxlifetime)
    {
        $result = $this-&gt;currentHandler-&gt;gc($maxlifetime);
        $this-&gt;writeOnlyHandler-&gt;gc($maxlifetime);

        return $result;
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function open($savePath, $sessionName)
    {
        $result = $this-&gt;currentHandler-&gt;open($savePath, $sessionName);
        $this-&gt;writeOnlyHandler-&gt;open($savePath, $sessionName);

        return $result;
    }

    /**
     * @return string
     */
    #[\ReturnTypeWillChange]
    public function read($sessionId)
    {
        // No reading from new handler until switch-over
        return $this-&gt;currentHandler-&gt;read($sessionId);
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function write($sessionId, $sessionData)
    {
        $result = $this-&gt;currentHandler-&gt;write($sessionId, $sessionData);
        $this-&gt;writeOnlyHandler-&gt;write($sessionId, $sessionData);

        return $result;
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function validateId($sessionId)
    {
        // No reading from new handler until switch-over
        return $this-&gt;currentHandler-&gt;validateId($sessionId);
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function updateTimestamp($sessionId, $sessionData)
    {
        $result = $this-&gt;currentHandler-&gt;updateTimestamp($sessionId, $sessionData);
        $this-&gt;writeOnlyHandler-&gt;updateTimestamp($sessionId, $sessionData);

        return $result;
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>