Sentry's Unified PHP SDK provides a simple way to integrate error tracking into PHP applications, allowing developers to monitor and analyze errors in their code. To use the SDK, developers can install it using Composer and include a few lines of code to set up and configure the SDK. The SDK is designed to work with popular PHP frameworks like Laravel, providing a flexible and customizable solution for error tracking. With the SDK installed, developers can send unhandled errors and exceptions to Sentry, where they can be analyzed and used to improve their application's reliability and performance.