This tutorial provides a step-by-step guide on how to check the balance of a Twilio account using PHP. To start, developers need to set up their project folder and install the required dependencies, including Composer and Guzzle HTTP Client. They then construct the endpoint URL for the Balances.json endpoint, which requires Basic Authentication with their Account SID and Auth Token. The tutorial then guides users through requesting the balance from Twilio's API using Guzzle, and finally, displays how to read the response and view the account balance. By following this tutorial, developers can integrate real-time balance monitoring into their PHP applications, ensuring they stay within budget for communication-based apps.