Contributed by Kevin Bond in #45657 and #45783.

PHP attributes are arguably one of the new PHP features with more positive impact on how we develop applications. Attributes add structured, machine-readable metadata information in code. In Symfony we added support for them in: New in Symfony 5.2: Routing PHP attributes New in Symfony 5.2: Constraints as PHP attributes New in Symfony 5.2: Controller argument attributes New in Symfony 5.3: Service Autoconfiguration attributes New in Symfony 5.3: Autowiring Iterators/Locators and Aliases with Attributes New in Symfony 6.1: Service Decoration Attributes In Symfony 6.1 we're introducing another feature related to attributes so you can configure service autowiring with PHP attributes. In practice, this means that you can optionally not add any YAML/XML/PHP service configuration in config/ and configure your services directly in your code stored in src/. To do so, use the new #[Autowire] attribute in the constructor arguments of your services (or in the arguments of any controller method):

    use Symfony\Component\DependencyInjection\Attribute\Autowire;

class MyService { public function __construct(

[Autowire(service: 'some_service')]

    private $service1,

    #[Autowire(expression: 'service("App\\Mail\\MailerConfiguration").getMailerMethod()')
    private $service2,

    #[Autowire(value: '%env(json:file:resolve:AUTH_FILE)%')]
    private $parameter1,

    #[Autowire(value: '%kernel.project_dir%/config/dir')]
    private $parameter2,
) {}

// ...

}

In addition to the named arguments (service:, expression:, value:) you can also use the well-known service syntax used in Symfony's YAML config (@ for services and @= for expressions):

    use Symfony\Component\DependencyInjection\Attribute\Autowire;

class MyService { public function __construct(

[Autowire('@some_service')]

    private $service1,

    #[Autowire('@=service("App\\Mail\\MailerConfiguration").getMailerMethod()')
    private $service2,

    #[Autowire('%env(json:file:resolve:AUTH_FILE)%')]
    private $parameter1,
) {}

// ...

}

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https://symfony.com/blog/new-in-symfony-6-1-service-autowiring-attributes?utm_source=Symfony%20Blog%20Feed&utm_medium=feed