class Database { private static $_config = [ 'host' => 'localhost', 'username' => 'root', 'password' => '', 'database' => 'mydatabase' ]; // ... public static function connect() { $connection = new mysqli( self::$_config['host'], self::$_config['username'], self::$_config['password'], self::$_config['database'] ); // ... } }In this example, the $_config variable is defined as a private static array in the "Database" class. The "connect" method then accesses this variable to connect to the database using the mysqli driver. PHP static _config is often used in conjunction with package libraries, such as Symfony or Laravel, where a large number of configuration variables need to be easily accessible and modifiable. It allows for an organized and structured way of storing and accessing configuration values, improving the maintainability of the codebase.