funk.php

<?php

function route($method, $path, $callback) {
  $pattern = '{^' . preg_replace('{:(\w+)}', '(?<\1>[^/]+)', $path) . '$}';
  return function ($requiredMethod, $requiredPath) use ($pattern, $method, $callback) {
    if (preg_match("{^$method$}i", $requiredMethod)
        && preg_match($pattern, $requiredPath, $matches)) {
      $keys = array_filter(array_keys($matches), 'is_string');
      $parameters = array_intersect_key($matches, array_flip($keys));
      call_user_func_array($callback, $parameters);
      return true;
    }
  };
}

function server($routes) {
  return function ($method, $path) use ($routes) {
    foreach ($routes as $route) {
      if ($route($method, $path)) {
        return true;
      }
    }
    return ! print("Page not found");
  };
}

$index = route('GET|POST', '/', function () {
  echo "Index page!";
});

$hello = route('GET', '/:name', function ($name) {
  echo "Hello $name";
});

$app = server(array($index, $hello));

$app($_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI']);