midPHP
What are namespaces in PHP?
Updated May 24, 2026
Short answer
Namespaces prevent naming conflicts by grouping related classes and functions.
Deep explanation
Namespaces organize large applications and third-party packages. Composer autoloading relies heavily on namespace conventions like PSR-4.
Real-world example
Modern frameworks separate controllers, services, and repositories using namespaces.
Common mistakes
- Forgetting to import classes using the use keyword.
Follow-up questions
- What is PSR-4?
- Why are namespaces important?