What are some potential pitfalls of not properly managing session variables in PHP?

One potential pitfall of not properly managing session variables in PHP is the risk of exposing sensitive user data or allowing unauthorized access to certain parts of your application. To mitigate this risk, make sure to properly sanitize and validate all session data before using it in your application. 

// Start the session
session_start();

// Validate and sanitize session data before using it
if(isset($_SESSION['user_id'])) {
    $user_id = filter_var($_SESSION['user_id'], FILTER_SANITIZE_NUMBER_INT);
    // Use $user_id in your application
}

Keywords

session variables security vulnerabilities session hijacking data leakage session fixation

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