We recommend you install Slim with Composer.
Navigate into your project’s root directory and execute the bash command
shown below. This command downloads the Slim Framework and its third-party
dependencies into your project’s vendor/ directory.
composer require slim/slim:3.*
Require the Composer autoloader into your PHP script, and you are ready to start using Slim.
<?php
require 'vendor/autoload.php';
Don’t have Composer? It’s easy to install by following the instructions on their download page.