[Drupal] Redirects in settings.php with nikic/fast-route

composer.json

{
  ...
  "require": {
    ...
    "nikic/fast-route": "^1.0"
    ...
  }
  ...
}

end-of-settings.php

<?php
include 'redirects.php';

redirects.php

<?php
$redirects = [
 'something/{anything:.*}' => 'something-else/{anything}',
 'another/one/{anything:.*}' => 'something/else/{anything}',
]

doDedirects($redirects);

/**
 * Returns a HTTP 301 redirects and die on matching request.
 *
 * Match is done only on the request path (without the query string). Sources and their
 * destinations can contains name pattern used to match muliple paths. For instance,
 * use 'something/{anything:.*}' as source to match any path below `something/`. And
 * use 'something/else/{anything}' as its destination to redirect to same path below
 * 'something/else/`.
 *
 * @param $redirects
 *   Redirection rules as an associative array using source as key and destination as values.
 */
function doDedirects($redirects) {
  // Collect redirects routes
  $dispatcher = FastRoute\cachedDispatcher(function(FastRoute\RouteCollector $r) use ($redirects) {
    foreach ($redirects as $source => $destination) {
      $r->addRoute('GET', $source, $destination);
    }
  }, [
    'cacheFile' => sys_get_temp_dir()  . '/route.cache',
    'cacheDisabled' => FALSE,     /* optional, enabled by default */
  ]);

  if (!empty($_SERVER['REQUEST_METHOD']) && !empty($_SERVER['REQUEST_URI'])) {
    // Fetch method and URI (without the query string)
    $httpMethod = $_SERVER['REQUEST_METHOD'];
    $uri = rawurldecode(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH));

    // Match redirect rules and redirects if one is found.
    $routeInfo = $dispatcher->dispatch($httpMethod, $uri);
    if ($routeInfo[0] == FastRoute\Dispatcher::FOUND) {
      $replace = [];
      foreach ($routeInfo[2] as $key => $value) {
        $replace["{{$key}}"] = $value;
      }
      $dest = strtr($routeInfo[1], $replace);
      header("HTTP/1.1 301 Moved Permanently");
      header("Location: $dest");
      die();
    }
  }
}