What potential issues can arise when using session_destroy(), session_unset(), and session_write_close() in PHP?

When using session_destroy(), session_unset(), and session_write_close() in PHP, potential issues can arise if not used properly. It is important to remember that session_destroy() only destroys the session data on the server, but does not unset any session variables. To ensure all session variables are unset and the session is properly closed, it is recommended to unset all session variables before destroying the session and then call session_write_close() to write changes to the session file.

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

// Destroy the session
session_destroy();

// Write changes to the session file and close the session
session_write_close();