Summary  
This chapter explains how to decompose complex tasks into smaller functions and combine them—often via function composition and higher-order functions—to build modular, reusable code for solving problems.  

General domain of usage  
Data processing

A beginner-friendly course designed to introduce learners to the fundamentals of PHP functions. Explore how to define, call, and utilize functions, understand parameters and return values, grasp variable scope, and work with both built-in and user-defined functions. This course provides clear explanations, practical examples, and quizzes to reinforce your understanding.

Learn the foundational concepts of PHP functions, including how to define, call, and understand their basic structure.

Explore advanced features of PHP functions, including variable scope, anonymous functions, and default parameter values.

Apply your knowledge of functions by exploring built-in PHP functions, creating your own, and following best practices.

Combining Functions for Problem Solving

Combining Functions for Problem Solving