factory.php

factory.php

<?php

class UserProvider
{
    public function __construct(
        #[Service("user.cache-path")]
        public readonly string $cache_path
    ) {}

    #[Service("user.cache")]
    public function createCache(): CacheInterface
    {
        return new FileCache($this->cache_path);
    }

    #[Service] // defaults to the return-type `UserRepository::class`
    public function createUserRepository(
        #[Inject("user.cache")] CacheInterface $cache
    ): UserRepository
    {
        return new UserRepository($cache);
    }

    #[Extension]
    public function addLogger(
        #[Extend("loggers")] array $loggers,
        #[Inject("user.logger")] LoggerInterface $user_logger
    ): array
    {
        return [...$loggers, $user_logger, new AnotherLogger()];
    }

    #[Service("user.logger")]
    public function createUserLogger(): LoggerInterface
    {
        return new SomeLogger();
    }
}

Discussion here:

https://groups.google.com/g/php-fig/c/SWIfYEkw89I/m/HIw_nmUdAAAJ