REST APIs are the backbone of modern web and mobile applications. Whether you are building a React or Vue frontend, a mobile app, or integrating with third-party services — a well-structured REST API is essential. In this tutorial, you will learn how to build a complete RESTful API from scratch using plain PHP and MySQL. No frameworks required — just clean, structured, and production-ready code with proper HTTP methods, status codes, input validation, and error handling.
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