Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs. 

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Recommend you install Slim with Composer.

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composer require slim/slim:"4.*"

composer require slim/psr7

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<?php

use Psr\Http\Message\ResponseInterface as Response;

use Psr\Http\Message\ServerRequestInterface as Request;

use Slim\Factory\AppFactory;

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

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$app = AppFactory::create();

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$app->get('/', function (Request $request, Response $response, $args) {

    $response->getBody()->write("Hello world!");

    return $response;

});

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$app->run();

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