if (isset($_SESSION['username'])) { $user = $_SESSION['username']; echo "Welcome " . $user . "!"; } else { echo "Please log in first!"; }
if (isset($_SERVER['PHP_AUTH_USER'])) { $user = $_SERVER['PHP_AUTH_USER']; echo "Authenticated as " . $user . "!"; } else { header('WWW-Authenticate: Basic realm="My Realm"'); header('HTTP/1.0 401 Unauthorized'); echo "Please enter your username and password:"; }This code checks if the 'PHP_AUTH_USER' variable is set, which would indicate that the user is authenticated. If it is, a message is displayed indicating the authenticated user. If not, the code sends a HTTP 401 Unauthorized response to prompt the user to enter their username and password. The GetAuthUser function is commonly used in PHP frameworks and libraries, such as Laravel, Symfony, and CodeIgniter, among others. It is included in the PHP standard library and does not require any external packages or libraries.