In this section, you will take you first steps with the Slim framework. For this, you will first use Composer to install the framework and then build a small sample application that will show you the basic principles of the framework.
The Slim framework can be easily installed using Composer. It requires PHP in at least version 5.5, but also works well with PHP 7. Start by initializing a new project with Composer:
$ composer init .
This will create a new project-level composer.json file for our project. Now you can add the slim/slim package as a dependency:
$ composer require slim/slim
You can now start using the Slim framework in your PHP application. For this, create an index.php file in your web server's document root with the following content:
<?php
use \Slim\App;
use \Slim\Http\Request;
use \Slim\Http\Response;
require "vendor/autoload.php";
$app = new App();
$app->get("/", function(Request ...