text: <?php
  function handler($context){
      /** @var \Psr\Http\Message\ResponseInterface $response */
      $response = $context["response"];
      /** @var \Psr\Http\Message\ServerRequestInterface $request */
      $request = $context["request"];
      /** @var \Psr\Log\LoggerInterface $logger */
      $logger = $context["logger"];
      
      $response->getBody()->write("Hello from handler PHP");
      $logger->warning("Hello logger");
  }