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Symfony DI v4.0.0 Release Notes

    • Relying on service auto-registration while autowiring is not supported anymore. Explicitly inject your dependencies or create services whose ids are their fully-qualified class name.

    Before:

       namespace App\Controller;

   use App\Mailer;

   class DefaultController
   {
       public function __construct(Mailer $mailer) {
           // ...
       }

       // ...
   }

       services:
       App\Controller\DefaultController:
           autowire: true

    After:

       // same PHP code

       services:
       App\Controller\DefaultController:
           autowire: true

       # or
       # App\Controller\DefaultController:
       #     arguments: { $mailer: "@App\Mailer" }

       App\Mailer:
           autowire: true
    ```
 * removed autowiring services based on the types they implement
 * added a third `$methodName` argument to the `getProxyFactoryCode()` method
   of the `DumperInterface`
 * removed support for autowiring types
 * removed `Container::isFrozen`
 * removed support for dumping an ucompiled container in `PhpDumper`
 * removed support for generating a dumped `Container` without populating the method map
 * removed support for case insensitive service identifiers
 * removed the `DefinitionDecorator` class, replaced by `ChildDefinition`
 * removed the `AutowireServiceResource` class and related `AutowirePass::createResourceForClass()` method
 * removed `LoggingFormatter`, `Compiler::getLoggingFormatter()` and `addLogMessage()` class and methods, use the `ContainerBuilder::log()` method instead
 * removed `FactoryReturnTypePass`
 * removed `ContainerBuilder::addClassResource()`, use the `addObjectResource()` or the `getReflectionClass()` method instead.
 * removed support for top-level anonymous services
 * removed silent behavior for unused attributes and elements
 * removed support for setting and accessing private services in `Container`
 * removed support for setting pre-defined services in `Container`
 * removed support for case insensitivity of parameter names
 * removed `AutowireExceptionPass` and `AutowirePass::getAutowiringExceptions()`, use `Definition::addError()` and the `DefinitionErrorExceptionPass` instead