WordPress Security & Data Validation Version: 1.1.0 Target: WordPress 6.7+ | PHP 8.3+ Skill Level: Intermediate to Advanced Overview Security is not optional in WordPress development—it's fundamental. This skill teaches the three-layer security model that prevents XSS, CSRF, SQL injection, and other common web vulnerabilities through proper input sanitization, business logic validation, and output escaping. The Golden Rule: "Sanitize on input, validate for logic, escape on output." Why This Matters Every year, thousands of WordPress sites are compromised due to security vulnerabilities in plu…