What potential issues can arise when working with session variables in PHP?

One potential issue when working with session variables in PHP is the possibility of session hijacking, where an attacker gains unauthorized access to a user's session data. To prevent this, it is important to use secure session handling techniques, such as regenerating the session ID after a user logs in or out. 

// Start a secure session
session_start([
    'cookie_lifetime' => 86400, // Set the session cookie to expire in 24 hours
    'cookie_secure' => true, // Only send the cookie over HTTPS
    'cookie_httponly' => true, // Prevent JavaScript access to the cookie
]);

// Regenerate the session ID to prevent session fixation
session_regenerate_id(true);

Keywords

session variables PHP security vulnerabilities session hijacking data loss

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