What alternatives exist for changing session IDs in PHP if session_regenerate_id() is not available?

If session_regenerate_id() is not available in PHP, an alternative method to change session IDs is to manually create a new session ID, copy the session data to the new session ID, and then destroy the old session. This can be achieved by starting a new session, copying the data from the old session to the new session, and then destroying the old session.

<?php

// Start the session
session_start();

// Create a new session ID
$newSessionID = session_create_id();

// Copy the session data to the new session ID
$_SESSION[$newSessionID] = $_SESSION[session_id()];

// Destroy the old session
session_destroy();

// Set the new session ID as the current session ID
session_id($newSessionID);

// Start the new session
session_start();

// Optionally, unset the old session data
unset($_SESSION[$newSessionID]);

?>