What are some potential issues with using session IDs for login authentication in PHP?

One potential issue with using session IDs for login authentication in PHP is that session fixation attacks can occur, where an attacker sets a user's session ID before the user logs in, allowing the attacker to gain unauthorized access. To prevent this, you can regenerate the session ID upon successful login to mitigate the risk of session fixation attacks.

session_start();

// Check if login is successful
if($login_successful) {
    // Regenerate session ID to prevent session fixation attacks
    session_regenerate_id(true);
}