How can PHP developers protect against unauthorized access to server configurations and sensitive data stored in PHP scripts?

To protect against unauthorized access to server configurations and sensitive data stored in PHP scripts, developers should ensure that their server configurations are secure, use secure coding practices to prevent data leakage, and implement proper access control mechanisms.

// Example of protecting sensitive data in PHP script
define('DB_USERNAME', 'username');
define('DB_PASSWORD', 'password');
define('DB_HOST', 'localhost');

// Restrict access to sensitive data by placing it outside the web root directory
// For example, store sensitive data in a separate config file and include it in your PHP scripts