Free online coursePHP

Course Description

Unlock the skills to build real, dynamic websites with PHP, one of the most widely used server-side languages on the web. In this free online course, you will go from setting up a local development environment to writing clean, maintainable PHP that powers interactive pages, processes user input and communicates with a database. Whether you are starting your web development journey or adding backend skills to your toolkit, PHP remains a practical choice thanks to its broad hosting support, mature ecosystem and strong connection to everyday website features.

You will learn the core building blocks that make applications work behind the scenes: variables, data types and expressions, string handling and concatenation, arrays (including multi-dimensional structures), loops, and conditional logic. As you progress, you will start organizing code with functions, understand scope and global variables, and handle common patterns that show up in professional projects. The course also focuses on how pages can be assembled reliably using include and require, helping you keep layouts and reusable components consistent across a site.

Working with user-facing features is a key part of backend development, so you will practice processing web forms with GET and POST, handling superglobals, and validating inputs in a way that improves both usability and security. You will see how to store and display helpful error messages, validate fields like email addresses, and reduce risk from common threats such as cross-site scripting by sanitizing and escaping data properly. Along the way, you will also use practical syntax options that make templates and nested logic easier to read and maintain.

To connect your application to persistent data, you will be introduced to relational databases and the role of MySQL in typical PHP stacks. You will learn how PHP files communicate with a database, how a connection is established, and how to retrieve and sort records for display. You will also explore common web development techniques such as using query strings to show detail pages, handling default values with the null coalescing operator, and working with the filesystem by checking whether files exist and reading their contents when needed.

By the end, you will be able to create interactive pages that accept input, validate it, display dynamic results, and use data from a database to power simple applications. This course is designed to help you build confidence with backend fundamentals while reinforcing the habits that make code safer and easier to grow as your projects become more ambitious.