1. Go to this page and download the library: Download realodix/change-case library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
ChangeCase::headline('test string');
// 'Test String'
ChangeCase::headline('steve_jobs');
// Steve Jobs
ChangeCase::headline('EmailNotificationSent');
// Email Notification Sent