Sample counter server in ReactPHP

test.php

<?php

require 'vendor/autoload.php';

$counter = new stdClass();
$counter->counter = 100000;
$counter->requests = 0;

$app = function ($request, $response) use ($counter) {
    if ($request->getPath() === '/favicon.ico') {
       $response->writeHead(404, array('Content-Type' => 'text/plain'));
    } else {
       $response->writeHead(200, array('Content-Type' => 'text/plain'));
    }
   
    $counter->requests ++;
    switch ($request->getPath()) {
        case '/dec':
           $counter->counter --;
           $response->end('Stock decreased');
           break;
        case '/info':
           $response->write('Memory usage: ' . round(memory_get_usage()/(1024*1024), 4). "M\n");
           $response->write('Requests processed: ' . $counter->requests . "\n");
           $response->write('Current counter value: ' . $counter->counter . "\n"); 
           $response->end();
           break;
        default:
           $response->end('Current counter value: ' . $counter->counter . "\n");
           break;      
    }
};

$loop = React\EventLoop\Factory::create();
$socket = new React\Socket\Server($loop);
$http = new React\Http\Server($socket, $loop);

$http->on('request', $app);
echo "Server running at http://127.0.0.1:1337\n";

$socket->listen(1337);
$loop->run();