How can PHP session variables be properly managed to avoid undefined variable errors?

To properly manage PHP session variables and avoid undefined variable errors, it is important to check if the session variable is set before using it. This can be done using the isset() function to determine if a variable is set and is not NULL. By checking if the session variable is set before using it, you can prevent undefined variable errors in your PHP code. 

<?php
session_start();

// Check if the session variable is set before using it
if(isset($_SESSION['username'])) {
    $username = $_SESSION['username'];
    echo "Welcome, $username!";
} else {
    echo "Session variable 'username' is not set.";
}
?>

Keywords

PHP session variables error handling isset function session_start function

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