## Sanitization Issues

A sanitization issue is user input data that is not sanitized before being stored or used.

Using the case as a reference, check the code to see if the case in question has been properly sanitized.

Details:
- Data from `$_POST`, `$_GET`, `$_REQUEST`, `$_SERVER`, `$_COOKIE` must be sanitized.
- Common sanitization functions: `sanitize_text_field()`, `sanitize_email()`, `sanitize_file_name()`, `sanitize_title()`, `sanitize_url()`, `absint()`, `intval()`, `wp_kses()`, `wp_kses_post()`.
- Type casting (`(int)`, `(float)`, `(bool)`) counts as sanitization for the respective types.
- `isset()` and `empty()` are NOT sanitization functions.
- `wp_unslash()` is NOT a sanitization function by itself.
- If the data is passed directly to a function that handles its own sanitization (e.g., `update_option()` with a registered sanitize callback), it may not be an issue.
- If the data is only used in a comparison (e.g., `if ( $_GET['action'] === 'delete' )`), the risk is lower but sanitization is still recommended.
- Array access on superglobals should also be sanitized.
