<?php
  $siteNames = array(
    "leistung",
    "unternehmen",
    "fachwissen"
  );

  $requestHost = strtolower($_SERVER['HTTP_HOST']);

  $requestURI = strtolower(strtok($_SERVER["REQUEST_URI"],'?'));

  $requestSite = substr($requestURI, 1);
  $requestSite = empty($requestSite) ? 'index' : $requestSite;

  // set $responseSite and $redirectSite according to $responseLang and $requestSite
  if ( array_key_exists($requestSite, $siteNames) ) {
    $responseSite = $requestSite;
  } else {
    $responseSite = 'index';
    $redirectSite = '';
  }

  // redirect or response
  if ( file_exists($_SERVER['DOCUMENT_ROOT'] . '/' . $responseSite . '.de.html') ) {
    readfile($_SERVER['DOCUMENT_ROOT'] . '/' . $responseSite . '.de.html');
  } else {
    header('Location: https://levien.lietzi.de',true,301);
    exit;
  }

?>