// Include the MySQLi library include('mysqli.php'); // Get the database key from a configuration file $key = getDBkey('mysql', 'user', 'password', 'localhost', 'mydatabase'); // Establish a connection to the database $db = new mysqli('localhost', $key['user'], $key['password'], $key['database']);
// Include the PostgreSQL library include('postgresql.php'); // Get the database key from an environment variable $key = getDBkey('postgresql', getenv('PGUSER'), getenv('PGPASSWORD'), getenv('PGHOST'), getenv('PGDATABASE')); // Establish a connection to the database $db = pg_connect("user={$key['user']} password={$key['password']} host={$key['host']} dbname={$key['database']}");In this example, getDBkey retrieves the PostgreSQL database key from environment variables and returns an array containing the database username, password, host, and database name. The pg_connect function is then used to establish a connection to the database using the retrieved database key. Package/library: It is difficult to determine the specific package or library that getDBkey function belongs to as it is a custom function that can be implemented in any PHP application or framework. However, it is commonly used in conjunction with popular PHP database libraries such as MySQLi, PostgreSQL, PDO, etc. to retrieve database keys and establish database connections.