typed factory

ArbitraryRun.php

<?php

declare(strict_Types=1);

namespace Example;

(function () : void {
    $requestFactory = new class implements ServerRequestFactory {
        public function __invoke() : ServerRequest
        {
            return SpecificServerRequest(123, 456);
        }
    };

    (new RequestHandlerRunner($requestFactory))->run();
})();

RequestHandlerRunner.php

<?php

declare(strict_Types=1);

namespace Example;

final class RequestHandlerRunner
{
    /** ServerRequestFactory */
    private $requestFactory;
  
    public function __construct(ServerRequestFactory $requestFactory)
    {
        $this->requestFactory = $requestFactory;
    }
  
    public function run() : void
    {
        $request = ($this->requestFactory)();
      
        // doi stuff with ServerRequest
    }
}

ServerRequestFactory.php

<?php

declare(strict_Types=1);

namespace Example;

interface ServerRequestFactory
{
    public function __invoke() : ServerRequest;
}