Symfony instantiate a service one time and use it with several users

Question

I am trying to do a service that is instantiated only one time. And then re-used any time I need it when a new user access my homepage. What I am trying to do is a service once

Answer 1

You can't achieve it in php directly. For php every call (page refresh) is a separate request, so every call creates a new instance of your class (defined as a service) - this new instance knows nothing about previous one with datetime set.

You can solve this problem in (at least) two ways:

1. Session

Create your service class and store current datetime in session. Next time your service is called (and instantiated) you will check previous request time. Downside of this solution is that session will time out and is specific to user and as far as I understood well you want to have this no matter which user calls your action. See solution number 2

2. Persistence

Save your datetime in some persistent layer - for example database or file. Then you can read in your service from this data source and tell what is time difference between current and previous request (and you don't worry about user or session timeout)