// Action

<?php

use Utopia\Platform\Action;

class HelloWorldAction extends Action
{
    public function __construct()
    {
        $this->httpPath = '/hello';
        $this->httpMethod = 'GET';
        $this->inject('response');
        $this->callback(fn ($response) => $this->action($response));
    }

    public function action($response)
    {
        $response->send('Hello World!');
    }
}

// service

use Utopia\Platform\Service;

class HelloWorldService extends Service
{
    public function __construct()
    {
        $this->type = Service::TYPE_HTTP;
        $this->addAction('hello', new HelloWorldAction());
    }
}

// Platform

use Utopia\Platform\Platform;

class HelloWorldPlatform extends Platform
{
    public function __construct()
    {
        $this->addService('helloService', new HelloWorldService());
    }
}

// Using platform to initialize http service

$platform = new HelloWorldPlatform();
$platform->init('http');