wiki/content/20201109140137-symfony_4_0.md

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---
id: eaf00cf5-efb7-4f53-b721-4f0592671400
title: Symfony 4.0
---
# What's new
## Profiler
- [Validator information in the Symfony
profiler](20201109140046-validator_information_in_the_symfony_profiler)
- [User impersonation in debug
toolbar](20201109143336-symfony_user_impersonation_in_debug_toolbar)
## Validation
### Constraints
- [ExpressionLanguage
Constraint](20201109150640-expressionlanguage_constraint)
- [Groups support for Valid
constraint](20201109145724-groups_support_for_valid_constraint)
## Annotations
- [Prefix all controller route
names](20201109142351-prefix_all_controller_route_names)
## Subscribers
- [Subscribing to events in the micro
kernel](20201109150109-subscribing_to_events_in_the_micro_kernel)
## Components
### Stopwatch
- [reset() method](20201109141042-reset_method)
- [Microseconds support](20201109141116-microseconds_support)
### Command
- [Lazy Commands](20201109141540-lazy_commands)
### Translation
- [XLIFF 2.0](20201109142907-xliff_2_0)
### Guard
- [getCredentials() responsibilities
split](20201109152527-getcredentials_responsibilities_split)
## Sessions
- [Lazy Sessions](20201109151019-lazy_sessions)
## Commands
- [debug:autowiring](20201109151937-debug_autowiring)
- [debug:form](20201109152714-debug_form)
## Autowiring
- [Local Service Binding](20201109153159-local_service_binding)