2024-05-06 20:40:05 +00:00
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2024-10-29 18:27:12 +00:00
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date: 2020-11-09
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2024-05-06 20:40:05 +00:00
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id: eaf00cf5-efb7-4f53-b721-4f0592671400
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title: Symfony 4.0
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---
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# What's new
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## Profiler
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- [Validator information in the Symfony
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profiler](20201109140046-validator_information_in_the_symfony_profiler)
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- [User impersonation in debug
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toolbar](20201109143336-symfony_user_impersonation_in_debug_toolbar)
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## Validation
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### Constraints
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- [ExpressionLanguage
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Constraint](20201109150640-expressionlanguage_constraint)
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- [Groups support for Valid
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constraint](20201109145724-groups_support_for_valid_constraint)
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## Annotations
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- [Prefix all controller route
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names](20201109142351-prefix_all_controller_route_names)
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## Subscribers
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- [Subscribing to events in the micro
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kernel](20201109150109-subscribing_to_events_in_the_micro_kernel)
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## Components
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### Stopwatch
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- [reset() method](20201109141042-reset_method)
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- [Microseconds support](20201109141116-microseconds_support)
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### Command
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- [Lazy Commands](20201109141540-lazy_commands)
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### Translation
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- [XLIFF 2.0](20201109142907-xliff_2_0)
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### Guard
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- [getCredentials() responsibilities
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split](20201109152527-getcredentials_responsibilities_split)
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## Sessions
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- [Lazy Sessions](20201109151019-lazy_sessions)
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## Commands
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- [debug:autowiring](20201109151937-debug_autowiring)
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- [debug:form](20201109152714-debug_form)
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## Autowiring
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- [Local Service Binding](20201109153159-local_service_binding)
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