What is the recommended method in PHP to retrieve the current user's username?

To retrieve the current user's username in PHP, you can use the $_SESSION superglobal array if you have stored the username in a session variable after the user has logged in. Another common method is to use the $_SERVER superglobal array to get the username from the server environment variables. You can also use authentication functions provided by frameworks or libraries to retrieve the current user's username securely.

// Using session variable to retrieve the current user's username
session_start();
if(isset($_SESSION['username'])){
    $username = $_SESSION['username'];
    echo "Current user's username: " . $username;
}

// Using server environment variables to retrieve the current user's username
$username = $_SERVER['REMOTE_USER'];
echo "Current user's username: " . $username;