ETA Notifications with PHP and Laravel` is a tutorial that guides developers through building a notification system for an on-demand laundry service using PHP and Laravel. The system uses Twilio's REST API to send SMS notifications to customers when their orders are picked up or delivered. The tutorial covers setting up the Twilio REST client, sending SMS messages, handling status callbacks from Twilio, and integrating the system with the Laravel application. It provides a basic example of how to implement an on-demand notification service using PHP and Laravel, and can be extended to include additional features such as automated workflows, disposable phone numbers, and more.