What are the best practices for managing sessions in PHP to ensure secure login and logout functionality?

To ensure secure login and logout functionality in PHP, it is important to properly manage sessions. This includes using session variables to store user authentication information securely and destroying the session data upon logout to prevent unauthorized access. 

// Start the session
session_start();

// Set session variables upon successful login
$_SESSION['user_id'] = $user_id;
$_SESSION['username'] = $username;

// Destroy session data upon logout
session_unset();
session_destroy();

Keywords

sessions PHP secure login logout functionality management

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