index.php

<?php

require __DIR__ . '/../vendor/autoload.php';

$dispatcher = FastRoute\simpleDispatcher(function(FastRoute\RouteCollector $router) {
    $router->get('/products', function(){
        return 'This route responds to requests with the GET method at the path /example';
    });
});

$method = $_SERVER['REQUEST_METHOD'];
$uri = $_SERVER['REQUEST_URI'];

if (false !== $pos = strpos($uri, '?')) {
    $uri = substr($uri, 0, $pos);
}
$uri = rawurldecode($uri);

$routeInfo = $dispatcher->dispatch($method, $uri);
switch ($routeInfo[0]) {
    case FastRoute\Dispatcher::NOT_FOUND:
        echo '404 Not Found';
        break;
    case FastRoute\Dispatcher::METHOD_NOT_ALLOWED:
        $allowedMethods = $routeInfo[1];
        echo '405 Method Not Allowed';
        break;
    case FastRoute\Dispatcher::FOUND:
        $handler = $routeInfo[1];
        $vars = $routeInfo[2];
        echo $handler($vars);
        break;
}