What are the potential security risks of not properly checking session deletion in PHP?

Not properly checking session deletion in PHP can lead to security risks such as session hijacking or unauthorized access to user data. To mitigate this risk, it is important to ensure that sessions are properly destroyed when they are no longer needed, such as when a user logs out or their session expires. 

// Properly check and destroy session when user logs out
session_start();

// Unset all session variables
$_SESSION = array();

// If desired, clear session cookie
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

// Destroy the session
session_destroy();

Keywords

session deletion security risks PHP vulnerability data leakage

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