php - The "session.storage.factory.service" service is deprecated,

one text

Solution:

Your framework.yaml session section should look like:

    session:
        handler_id: null
        cookie_secure: auto
        cookie_samesite: lax
        storage_factory_id: session.storage.factory.native

This is the default config you get with a new 5.3 project. You can leave the save_path entry if you want. The storage_value_id was introduced in 5.3.

According to the storage_factory_id docs, the default value should already be factory.native. Which implies that you don't actually need the entry at all.

However, bin/console debug:config framework session shows different results if you leave it out. Not sure it that is an error or not.

In any event, add the storage_factory_id and the error should go away.