function getUserByName($username) { // connect to the database $conn = new mysqli('localhost', 'username', 'password', 'database-name'); // prepare an SQL query $sql = "SELECT * FROM users WHERE username = '$username' LIMIT 1"; // execute the query and fetch the result $result = $conn->query($sql); $user = $result->fetch_assoc(); // close the database connection $conn->close(); // return the user data return $user; }In this example, the getUserByName function takes a string parameter representing the username and returns an array of user data retrieved from the database. The function first connects to the database using the mysqli class and executes an SQL query to select the user with the given username. It then retrieves the result and returns it to the calling code. The package library that the getUserByName method belongs to is likely a database abstraction layer or an ORM (Object-Relational Mapping) framework that provides a set of tools and utilities for managing database connections, executing queries, and mapping data between database tables and objects in the application. Examples of popular PHP packages that include similar functionality are Doctrine, Laravel Eloquent, and Propel.