PHP built-in server router

router.php

<?php
// router.php
if (PHP_SAPI == 'cli-server') {
  $path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
  if ($path[0] == '/') {
    $path = substr($path, 1);
  }
  if (!is_file($path) && !is_dir($path)) {
    // Fixes include issues when running from another directory than the router
    chdir(__DIR__);
    require 'index.php';
  } else {
    return false;
  }
}
return true;

if (php_sapi_name() == 'cli-server') {
  $path = trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/') . '/';

  if ( ! file_exists($path)) {
    require 'index.php';
  }
}