session_start(); // start session if(isset($_SESSION['user_id'])){ // check if user is logged in $user_id = $_SESSION['user_id']; // retrieve user id from session $user = getUser($user_id); // retrieve user information using getUser function echo "Welcome " . $user['username']; // display welcome message with the user's username } else{ header("Location: login.php"); // redirect to login page if user is not logged in } function getUser($user_id){ // code to retrieve user information from database return $user; // return user information as an associative array }
require __DIR__ . '/vendor/autoload.php'; // require package library use App\User; // import User class from package library session_start(); // start session if(isset($_SESSION['user_id'])){ // check if user is logged in $user_id = $_SESSION['user_id']; // retrieve user id from session $user = User::find($user_id); // retrieve user information using package library echo "Welcome " . $user->name; // display welcome message with the user's name } else{ header("Location: login.php"); // redirect to login page if user is not logged in }In this example, the getUser function is replaced by the User::find method from an external package library. The class is imported and used to retrieve user information from a database. The user's name is then used to display a welcome message. Package library: The example uses an external package library called "App" that includes a User class with a "find" method.