nothing change expect my path
You need to install it in the right director under public_html folder. Then you can install it using following command
composer require slim/slim"^3.0"
Once installed, add following code in index.php file
<?php require 'vendor/autoload.php'; $app = new Slim\App();
However, for this method to work, you must have access to composer on your hosting provider. Most of the PHP hosting providers, like Cloudways and ServerPilot, provides composer on their servers.
Running composer on a production server is not a good idea. Please don’t do that!
Run composer only within your development or CI environment. Create an
artifact you can deploy on your test/staging/prod webserver.