Test nikic/fast-route

composer.json

{
    "name": "memeddev/accounts-service",
    "description": "Accounts Service",
    "type": "library",
    "require": {
        "nikic/fast-route": "^1.3"
    },
    "require-dev": {
        "phpunit/phpunit": "^7.0",
        "php": "^7.1"
    },
    "autoload": {
        "psr-4": {
            "Memed\\Accounts\\": "src"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Memed\\Accounts\\": "tests/unit"
        }
    },
    "minimum-stability": "stable"
}

Index.php

<?php
/**
 * Memed Accoutns
 *
 * PHP version 7
 *
 * @category  PHP
 * @package   Memed\Accoutns
 * @author    William Espindola <[email protected]>
 * @copyright Memed
 */
declare(strict_types=1);

namespace Memed\Accounts\Routes;

class Login
{
    public function __invoke()
    {
        header("HTTP/1.0 200 Ok");
        echo 'invoked index';
    }
}

index.php

<?php
/**
 * Memed Accoutns
 *
 * PHP version 7
 *
 * @category  PHP
 * @package   Memed\Accoutns
 * @author    William Espindola <[email protected]>
 * @copyright Memed
 */
declare(strict_types=1);

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

$dispatcher = FastRoute\simpleDispatcher(function(FastRoute\RouteCollector $r) {
    $r->addRoute('GET', '/login', \Memed\Accounts\Routes\Login::class);
});

// Fetch method and URI from somewhere
$httpMethod = $_SERVER['REQUEST_METHOD'];
$uri = $_SERVER['REQUEST_URI'];

// Strip query string (?foo=bar) and decode URI
if (false !== $pos = strpos($uri, '?')) {
    $uri = substr($uri, 0, $pos);
}
$uri = rawurldecode($uri);

$routeInfo = $dispatcher->dispatch($httpMethod, $uri);
switch ($routeInfo[0]) {
    case FastRoute\Dispatcher::NOT_FOUND:
        header("HTTP/1.0 404 Not Found");
        break;
    case FastRoute\Dispatcher::METHOD_NOT_ALLOWED:
        $allowedMethods = $routeInfo[1];
        header("HTTP/1.0 405 Method Not Allowed");
        break;
    case FastRoute\Dispatcher::FOUND:
        $handler = $routeInfo[1];
        $vars = $routeInfo[2];
        call_user_func(new $handler, $vars);
        break;
}