How can PHP code be made inaccessible to site visitors to ensure security?

To ensure security, PHP code should not be accessible to site visitors. One way to achieve this is by placing PHP files outside of the web root directory, so they cannot be accessed directly through a URL. This prevents users from viewing the code and potentially exploiting any vulnerabilities.

// Place PHP files outside of the web root directory to prevent direct access
// For example, store PHP files in a directory like /home/user/php_scripts/

// Example: If your web root directory is /var/www/html/, store PHP files outside of it