midPHP
How does authentication work in PHP?
Updated May 24, 2026
Short answer
Authentication verifies user identity using credentials, sessions, or tokens.
Deep explanation
Modern authentication uses password hashing, session management, OAuth, or JWTs. Security best practices include CSRF protection and HTTPS.
Real-world example
Enterprise applications use JWT authentication for APIs.
Common mistakes
- Storing plaintext passwords and weak session handling.
Follow-up questions
- What is JWT?
- Why use password_hash?