New in Symfony 2.8: Deprecating Scopes and Introducing Shared Services
Service scopes control how long an instance of a service is used by the container. The DependencyInjection component provides three scopes:
container(the default one) where the same instance is used each time you ask for a service from the container;
prototypewhere a new instance is created each time you ask for the service;
requestwhere a new instance is created for each subrequest (and it's unavailable outside the request).
request_stack service, introduced in Symfony 2.4, solved the problems
related to the
request scope and dealing with the
Request object in
services. This made us rethink the entire "scope" concept and we decided to
simplify the DependencyInjection component deprecating them entirely in Symfony
2.8 and removing them in Symfony 3.0.
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