// User model class User { public static function findByUsername($username) { // Database query to retrieve user data // SQL statement to select user by their username $query = "SELECT * FROM users WHERE username = ?"; // Prepare query $stmt = $pdo->prepare($query); // Execute query with username parameter $stmt->execute([$username]); // Retrieve user data $user = $stmt->fetch(); // Return user data return $user; } }In this example, the User model has a static method called findByUsername which takes in a username parameter. This method uses a database query to retrieve the user data from the database based on the username provided. The SELECT statement in the query is looking for the user with the matching username. When executed, the method returns an array of user data. The package library used in this example is PDO, which is a PHP extension used to connect to and interact with databases.