DI in the API demo app

Yii 3.0 Ask a question
1

Hi all.
If I run the API demo app: GitHub - yiisoft/app-api: Yii3 API application template
… And add one argument ServerRequestInterface $request to the _invoke() method in the IndexAction, how does PHP know it should provide instance of HttpSoft\Message\ServerRequest?

I am not able to track the logic.

Thanks for any hints.

PS)
My attempts were:

  • If I try to seach for ServerRequestInterface::class … nothing
  • I tried to search for “implements ServerRequestInterface” it took me to vendor/httpsoft/http-message/src/ServerRequest.php
  • Then I searched for “new ServerRequest” and found it in vendor/httpsoft/http-message/src/ServerRequestFactory.php
  • So I found “ServerRequestFactory::class” in config/web/di/psr17.php
  • … and I need to continue with “ServerRequestFactoryInterface” (see psr17.php)

… but this is not the way how to correctly find where do dependencies come from. Right? There must be a logical way.