Symfony2.8 Sessions in MongoDB. How to set up correctly?

Question

symfony

Hello.
For a project on Symfony (v2.8.9) I'm trying to set up session storage in MongoDB. The server has PHP7.0.8 installed. The mongodb driver is installed via pecl and extension=mongodb.so is added to php.ini
sudo pecl install mongodb
I configure Symfony as described in the " How to Use MongoDbSessionHandler to Store Sessions... " document, substituting my data for connecting to the database

# app/config/config.yml
framework:
    session:
        # ...
        handler_id:  session.handler.mongo
        cookie_lifetime: 2592000 # optional, it is set to 30 days here
        gc_maxlifetime: 2592000 # optional, it is set to 30 days here

services:
    # ...
    mongo_client:
        class: MongoClient
        # if using a username and password
        arguments: ['mongodb://%mongodb_username%:%mongodb_password%@%mongodb_host%:27017']
        
    session.handler.mongo:
        class: Symfony\Component\HttpFoundation\Session\Storage\Handler\MongoDbSessionHandler
        arguments: ['@mongo_client', '%mongo.session.options%']

# app/config/parameters.yml
parameters:
    # ...
    mongo.session.options:
        database: session_db # your MongoDB database name
        collection: session  # your MongoDB collection name
    mongodb_host: 1.2.3.4 # your MongoDB server's IP
    mongodb_username: my_username
    mongodb_password: my_password

In response to a request to the server, I get an error

ClassNotFoundException in appDevDebugProjectContainer.php line 2232:
Attempted to load class "MongoClient" from the global namespace.
Did you forget a "use" statement?

I tried to put MongoDB\Driver\Manager instead of the MongoClient class, it fails with an error

ClassNotFoundException in appDevDebugProjectContainer.php line 2232:
Attempted to load class "Manager" from namespace "MongoDB\Driver".
Did you forget a "use" statement for another namespace?

Could you tell me what could be the reason for the error and how to overcome it?

Answer 1

Probably, the information in the dock refers to the old driver. Add dependencies:

The Mongo PHP Adapter is a userland library designed to act as an adapter between applications relying on ext-mongo and the new driver (ext-mongodb).
It provides the API of ext-mongo built on top of mongo-php-library, thus being compatible with PHP 7.

Mongo PHP Adapter