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How can the PHP script be optimized to handle session variables more efficiently and prevent undefined index notices?

Session variables can be optimized by checking if they are set before accessing them to prevent undefined index notices. This can be done using the isset() function to determine if a session variable exists before using it in the script. By doing this, you can ensure that the script runs smoothly without encountering errors related to undefined session variables.

php 
session_start();

// Check if the session variable is set before accessing it
if(isset($_SESSION['username'])){
    $username = $_SESSION['username'];
} else {
    $username = "Guest";
}

echo "Welcome, $username!";

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