5. Data Validation and Security
This module covers the most important WordPress PHP security habits.
Lessons
- Validate, Sanitize, and Escape — handle data safely at input, storage, and output boundaries
- Nonces, Capabilities, and Secure Actions — protect state-changing requests
- Secure Files, Uploads, and Remote Data — handle files and external data defensively
Security Rule
Validate on input, sanitize before storage, escape on output, and check permissions before changing anything.
What's Next
- Continue to 6. WordPress Database and Queries