7. AJAX, REST, and Forms

This module shows how PHP receives browser input in WordPress.

Lessons

• Form Handling and admin-post.php — process classic form submissions safely
• AJAX Actions and REST Routes — build dynamic interactions with permission checks
• REST Arguments, Schemas, and Responses — make endpoints predictable for clients

Input Rule

Every request handler needs three things: permission rules, nonce or authentication checks, and sanitized data handling.

What's Next

• Continue to 8. Debugging, Performance, and Production