.htaccess file for routing

.htaccess

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule . /index.php [L]

index.php

<?php

require_once __DIR__ . '/../vendor/autoload.php';
$klein = new Klein\Klein();

$klein->respond('GET', '/hello-world', function () {
    return 'Hello World!';
});

$klein->respond('GET','/',function(){
    return "Hello";
});

$klein->respond(function () {
    return 'All the things';
});