php致命错误：找不到类’Slim’

为什么这会产生致命错误Slim未找到.

的index.PHP

<?PHP
require "Slim/Slim.PHP";

// create new Slim instance
$app = new Slim();

// add new Route 
$app->get("/",function () {
    echo "<h1>Hello Slim World</h1>";
});

// run the Slim app
$app->run();

请求的URL

GET : http://localhost/mywebapps/index.PHP 
GET:  http://localhost/mywebapps/

我在Windows上的目录结构

www/mywebapps/
             Slim- slim frameworks folder(Having Slim.PHP and other files also)
             index.PHP - PHP file

我做错了什么,请帮帮我吧.

我通过这样做找到了解决方案.

<?PHP
require "Slim/Slim.PHP";

\Slim\Slim::registerautoloader();

// create new Slim instance
$app = new \Slim\Slim();