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    <h3>Editing: MongoDbSessionHandler.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;

use MongoDB\BSON\Binary;
use MongoDB\BSON\UTCDateTime;
use MongoDB\Client;
use MongoDB\Collection;

/**
 * Session handler using the mongodb/mongodb package and MongoDB driver extension.
 *
 * @author Markus Bachmann &lt;markus.bachmann@bachi.biz&gt;
 *
 * @see https://packagist.org/packages/mongodb/mongodb
 * @see https://php.net/mongodb
 */
class MongoDbSessionHandler extends AbstractSessionHandler
{
    private $mongo;

    /**
     * @var Collection
     */
    private $collection;

    /**
     * @var array
     */
    private $options;

    /**
     * Constructor.
     *
     * List of available options:
     *  * database: The name of the database [required]
     *  * collection: The name of the collection [required]
     *  * id_field: The field name for storing the session id [default: _id]
     *  * data_field: The field name for storing the session data [default: data]
     *  * time_field: The field name for storing the timestamp [default: time]
     *  * expiry_field: The field name for storing the expiry-timestamp [default: expires_at].
     *
     * It is strongly recommended to put an index on the `expiry_field` for
     * garbage-collection. Alternatively it's possible to automatically expire
     * the sessions in the database as described below:
     *
     * A TTL collections can be used on MongoDB 2.2+ to cleanup expired sessions
     * automatically. Such an index can for example look like this:
     *
     *     db.&lt;session-collection&gt;.createIndex(
     *         { &quot;&lt;expiry-field&gt;&quot;: 1 },
     *         { &quot;expireAfterSeconds&quot;: 0 }
     *     )
     *
     * More details on: https://docs.mongodb.org/manual/tutorial/expire-data/
     *
     * If you use such an index, you can drop `gc_probability` to 0 since
     * no garbage-collection is required.
     *
     * @throws \InvalidArgumentException When &quot;database&quot; or &quot;collection&quot; not provided
     */
    public function __construct(Client $mongo, array $options)
    {
        if (!isset($options['database']) || !isset($options['collection'])) {
            throw new \InvalidArgumentException('You must provide the &quot;database&quot; and &quot;collection&quot; option for MongoDBSessionHandler.');
        }

        $this-&gt;mongo = $mongo;

        $this-&gt;options = array_merge([
            'id_field' =&gt; '_id',
            'data_field' =&gt; 'data',
            'time_field' =&gt; 'time',
            'expiry_field' =&gt; 'expires_at',
        ], $options);
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function close()
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    protected function doDestroy(string $sessionId)
    {
        $this-&gt;getCollection()-&gt;deleteOne([
            $this-&gt;options['id_field'] =&gt; $sessionId,
        ]);

        return true;
    }

    /**
     * @return int|false
     */
    #[\ReturnTypeWillChange]
    public function gc($maxlifetime)
    {
        return $this-&gt;getCollection()-&gt;deleteMany([
            $this-&gt;options['expiry_field'] =&gt; ['$lt' =&gt; new UTCDateTime()],
        ])-&gt;getDeletedCount();
    }

    /**
     * {@inheritdoc}
     */
    protected function doWrite(string $sessionId, string $data)
    {
        $expiry = new UTCDateTime((time() + (int) \ini_get('session.gc_maxlifetime')) * 1000);

        $fields = [
            $this-&gt;options['time_field'] =&gt; new UTCDateTime(),
            $this-&gt;options['expiry_field'] =&gt; $expiry,
            $this-&gt;options['data_field'] =&gt; new Binary($data, Binary::TYPE_OLD_BINARY),
        ];

        $this-&gt;getCollection()-&gt;updateOne(
            [$this-&gt;options['id_field'] =&gt; $sessionId],
            ['$set' =&gt; $fields],
            ['upsert' =&gt; true]
        );

        return true;
    }

    /**
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function updateTimestamp($sessionId, $data)
    {
        $expiry = new UTCDateTime((time() + (int) \ini_get('session.gc_maxlifetime')) * 1000);

        $this-&gt;getCollection()-&gt;updateOne(
            [$this-&gt;options['id_field'] =&gt; $sessionId],
            ['$set' =&gt; [
                $this-&gt;options['time_field'] =&gt; new UTCDateTime(),
                $this-&gt;options['expiry_field'] =&gt; $expiry,
            ]]
        );

        return true;
    }

    /**
     * {@inheritdoc}
     */
    protected function doRead(string $sessionId)
    {
        $dbData = $this-&gt;getCollection()-&gt;findOne([
            $this-&gt;options['id_field'] =&gt; $sessionId,
            $this-&gt;options['expiry_field'] =&gt; ['$gte' =&gt; new UTCDateTime()],
        ]);

        if (null === $dbData) {
            return '';
        }

        return $dbData[$this-&gt;options['data_field']]-&gt;getData();
    }

    private function getCollection(): Collection
    {
        if (null === $this-&gt;collection) {
            $this-&gt;collection = $this-&gt;mongo-&gt;selectCollection($this-&gt;options['database'], $this-&gt;options['collection']);
        }

        return $this-&gt;collection;
    }

    /**
     * @return Client
     */
    protected function getMongo()
    {
        return $this-&gt;mongo;
    }
}
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