juniorPHP
What are functions in PHP?
Updated May 24, 2026
Short answer
Functions are reusable blocks of code designed to perform specific tasks.
Deep explanation
Functions improve modularity, maintainability, and code reuse. PHP supports default parameters, return types, variadic functions, and anonymous functions.
Real-world example
Payment processing logic is often encapsulated inside reusable functions.
Common mistakes
- Using global variables excessively instead of passing parameters.
Follow-up questions
- What are anonymous functions?
- What are return types?