function checkUser() { if (isset($_SESSION['user'])) { return true; } else { return false; } } // Usage if (checkUser()) { echo 'Welcome back, '.$_SESSION['user'].'!'; } else { echo 'Please log in to access this page.'; }
function checkUser($role = '') { if (isset($_SESSION['user']) && (!empty($role) && $_SESSION['role'] == $role)) { return true; } else { return false; } } // Usage if (checkUser('admin')) { // Display admin-only content } else { // Display regular content }From the examples given above, it is difficult to determine the package library as these are generic use-cases of the checkUser function. However, the checkUser function may be included as part of a broader PHP framework or library that provides various authentication and authorization features such as user registration, password recovery, session management and more. Some popular PHP libraries that provide such features are PHPAuth, Sentry and IonAuth.