https://github.com/symfony/symfony-docs/blob/master/components/http_foundation/session_configuration.rst#save-handler-proxy

why not tell readers about what a proxy is, what it used for, or why we should know about these stuff.

and the sectionsession lifetime andsession cookie lifetime is telling us a same thing isn't it?

and in the sectionNative PHP Save Handlers mentions that:

Specific details can be found in docblock of the setOptions() method of each class.

which class? handler class? I don't see asetOption() method in any of those handler class