For a beginner PHP tutorial, it's important to cover foundational topics that provide a solid understanding of PHP and its applications in web development. Here are some additional topics that would be beneficial for a beginner PHP tutorial:

1. PHP Syntax and Variables: Start with the basics, including PHP syntax, variables, data types, and basic operations. Explain how PHP scripts are embedded in HTML.

2. Conditional Statements and Loops: Introduce conditional statements (if, else, elseif) and loops (for, while, foreach) for making decisions and repeating actions in PHP.

3. Arrays: Cover how to create, manipulate, and iterate through arrays in PHP. Explain indexed arrays, associative arrays, and multi-dimensional arrays.

4. Functions: Explain how to create and use functions in PHP, including user-defined functions and built-in functions. Emphasize the concept of code reusability.

5. Form Handling: Describe how to create HTML forms and process form data in PHP. Cover topics like form validation, handling user input, and displaying error messages.

6. File Handling: Teach how to read from and write to files using PHP, including techniques for file uploads and file manipulation.

7. Database Connectivity with MySQL: Introduce MySQL databases and demonstrate how to connect to a database, perform CRUD (Create, Read, Update, Delete) operations, and execute SQL queries using PHP.

8. Error Handling: Discuss error handling techniques in PHP, including try-catch blocks, error reporting, and custom error handling functions.

9. Sessions and Cookies: Dive deeper into sessions (as discussed in the previous tutorial) and cookies. Explain how to store and retrieve user data and maintain user state.

10. Object-Oriented Programming (OOP): Provide an introduction to object-oriented programming in PHP, covering classes, objects, properties, and methods.

11. Security Best Practices: Highlight common security risks in PHP applications and teach best practices for preventing issues like SQL injection, cross-site scripting (XSS), and data validation.

12. Working with APIs: Show how to make HTTP requests and work with external APIs using PHP, allowing beginners to understand how to integrate data from external sources.

13. Regular Expressions: Introduce regular expressions and how to use them for pattern matching and text manipulation in PHP.

14. Debugging and Troubleshooting: Offer tips and techniques for debugging PHP code effectively and troubleshooting common issues.

These topics cover a broad range of PHP fundamentals, and they provide a strong foundation for beginners looking to develop web applications with PHP. Depending on the learners' interests and goals, you can dive deeper into specific areas as they progress in their PHP journey.