PHP url router like rails

.htaccess

RewriteEngine On

# Some hosts may require you to use the `RewriteBase` directive.
# If you need to use the `RewriteBase` directive, it should be the
# absolute physical path to the directory that contains this htaccess file.
#
# RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]

index.php

<?php
require_once 'route.php';

print_r(Route::map("/user/:id/:name"));

Route::map("/user/:id/:name", function($id, $name) {
	echo $id.' - '.$name;
});
?>

route.php

<?php
// Reference: http://blog.sosedoff.com/2009/09/20/rails-like-php-url-router/
class Route {

	public static function request_uri() {
		$uri = '';
		if (empty($_SERVER['PATH_INFO']) === false) {
			$uri = $_SERVER['PATH_INFO'];
		}else{
			if (isset($_SERVER['REQUEST_URI']) === true) {
				$scheme = empty($_SERVER['HTTPS']) === true || $_SERVER['HTTPS'] === 'off' ? 'http' : 'https';
				$uri = parse_url($scheme.'://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'], PHP_URL_PATH);
			}elseif (isset($_SERVER['PHP_SELF']) === true) {
				$uri = $_SERVER['PHP_SELF'];
			}else{
				return "";
            }

            $request_uri = isset($_SERVER['REQUEST_URI']) === true ? $_SERVER['REQUEST_URI'] : $_SERVER['PHP_SELF'];
			$script_name = $_SERVER['SCRIPT_NAME'];

			$base_uri = strpos($request_uri, $script_name) === 0 ? $script_name : str_replace('\\', '/', dirname($script_name));
			$base_uri = rtrim($base_uri, '/');

			if ($base_uri !== '' && strpos($uri, $base_uri) === 0) {
				$uri = substr($uri, strlen($base_uri));
			}

			return '/' . ltrim($uri, '/');
        }
	}

	public static function map($pattern_uri, $callback = null) {
		$request_uri = self::request_uri();

		// Get names: :id, :name
		preg_match_all('/:([0-9a-zA-Z_]+)/', $pattern_uri, $names, PREG_PATTERN_ORDER);
		$names = $names[0];

		// Form: /user/:id/:name
		// To  : /user/([a-zA-Z0-9_\+\-%]+)/([a-zA-Z0-9_\+\-%]+)/?
		$pattern_uri_regex  = preg_replace_callback('/:[[0-9a-zA-Z_]+/', array(__class__, 'pattern_uri_regex'), $pattern_uri);
		$pattern_uri_regex .= '/?';

		// Match pattern uri regex on request uri, fill params
		$params = array();
		if (preg_match('@^' . $pattern_uri_regex . '$@', $request_uri, $values)) {
			array_shift($values);

			foreach($names as $index => $value) {
				$params[substr($value, 1)] = urldecode($values[$index]);
			}

			if (is_callable($callback) === true) {
				call_user_func_array($callback, array_values($params));
			}
		}

		return $params;
	}

	public static function pattern_uri_regex($matches) {
		return '([a-zA-Z0-9_\+\-%]+)';
	}

}
?>