重定向到自定义PHP路由系统中的404错误页面

Question

我有一个基本的PHP路由系统，当它与所有插入的网址都不匹配时，我想知道如何将其重定向到404错误？
这是Router.php文件”

class Route
{
    /**
    * @var array $_listUri List of URI's to match against
    */
    private $_listUri = array();

    /**
    * @var array $_listCall List of closures to call 
    */
    private $_listCall = array();

    /**
    * @var string $_trim Class-wide items to clean
    */
    private $_trim = '/\^$';

    /**
    * add - Adds a URI and Function to the two lists
    *
    * @param string $uri A path such as about/system
    * @param object $function An anonymous function
    */
    public function add($uri, $function)
    {
        $uri = trim($uri, $this->_trim);
        $this->_listUri[] = $uri;
        $this->_listCall[] = $function;
    }

    /**
    * submit - Looks for a match for the URI and runs the related function
    */
    public function submit()
    {   
        $uri = isset($_REQUEST['uri']) ? $_REQUEST['uri'] : '/';
        $uri = trim($uri, $this->_trim);
        $uri = strtolower($uri);

        $replacementValues = array();

        /**
        * List through the stored URI's
        */
        foreach ($this->_listUri as $listKey => $listUri)
        {
            /**
            * See if there is a match
            */
            if (preg_match("#^$listUri$#", $uri))
            {
                /**
                * Replace the values
                */
                $realUri = explode('/', $uri);
                $fakeUri = explode('/', $listUri);

                /**
                * Gather the .+ values with the real values in the URI
                */
                foreach ($fakeUri as $key => $value) 
                {
                    if ($value == '.+') 
                    {
                        $replacementValues[] = $realUri[$key];
                    }
                }

                /**
                * Pass an array for arguments
                */
                call_user_func_array($this->_listCall[$listKey], $replacementValues);
            }
        }

    } 

}

`

然后将这个Router.php包含在我的index文件中，并调用此函数：

`

$route->add('/menu', function() {
include 'menu.php';
});
$route->submit();

`

示例

我想知道我是否写
这样的网址 www.domain.com/nothing代替www.domain.com/menu

它应该重定向到404错误页面

预先感谢