Can't find when the var/sessions folder used

[anyt]

According to the configuration, the application may write file sessions to the var/cache/<env>/sessions folder, which is a default location or the PHP configured location, that is, by default, is the tmp directory.

It is var/sessions only if you follow the documentation to change the default.

Considering the symfony/demo application is a ready to use example, I propose to start using the folder or remove it.