php 自制简单路由类 望大神指点

class route
{
    /** @var null  模块 */
    private static $module = null;
    /** @var null 控制器 */
    private static $controller = null;
    /** @var null 方法 */
    private static $action = null;
    /** @var  控制器url */
    private static $controllerPath;

    /**
     * route constructor.
     * @param array $config url
     */
    public function __construct($config = [])
    {
        $var_parse = explode('/', $config['r']);
        if (count($var_parse) == 3){
            self::$module = $var_parse[0];
            self::$controller = ucwords($var_parse[1]).'Controller';
            self::$action = $var_parse[2];
            self::$controllerPath = APP_ROOT.'/controllers/'.self::$module.'/'.self::$controller.'.php';
        }elseif(count($var_parse) == 2){
            self::$controller = ucwords($var_parse[0]).'Controller';
            self::$action = $var_parse[1];
            self::$controllerPath = APP_ROOT.'/controllers/'.self::$controller.'.php';
        }
    }

    /**
     * 执行控制器方法
     * @return null
     */
    public static function run(){
        self::register();
        $controller = new self::$controller;
        if(method_exists($controller, self::$action)){
            $action = self::$action;
            $controller->$action();
        }else{
            header("HTTP/1.1 404 Not Found");
        }
    }

    /**
     * 加载类
     */
    public static function register(){
        spl_autoload_register("self::loadClass");
    }

    //自动加载
    public static function loadClass(){
        if(!file_exists(self::$controllerPath)){
            header("HTTP/1.1 404 Not Found");
        }
        require_once self::$controllerPath;
    }
}