servig a static web site with platform.sh

<?php
$path = parse_url($_SERVER['REQUEST_URI']);
$path = rtrim(ltrim(rtrim($path["path"], '/'), '.'),'/'); //trim trailing slash and prefix dots
$index = realpath(getcwd() .$path ."/index.html");
if (substr($index, 0, strlen(realpath(getcwd()))) === realpath(getcwd()) && file_exists($index)){
  try {
      readfile($index);
      exit;
  } catch (Exception $e) {
      /*Eating all exceptions*/
      readfile($index);
      exit;
  }
} else { 
  http_response_code(404);
}