wordpress-security-validation

Prevent SQL injection in WordPress by using prepared statements with the `$wpdb->prepare()` method. This ensures database queries are executed safely by separating SQL logic from user-submitted data.

Sanitize and validate user input in WordPress by applying built-in functions like `sanitize_text_field` to clean dangerous characters and data validation functions to ensure input meets business logic requirements before processing.

Nonce implementation protects against CSRF in WordPress by generating unique tokens for forms and AJAX requests using `wp_nonce_field`. Verifying these tokens with `wp_verify_nonce` confirms the request originated from an authorized session.

Input sanitization alone does not guarantee PHP security because it only cleans incoming data. A complete approach requires combining sanitization with strict data validation, output escaping for XSS, and prepared statements for SQL injection.