How can developers troubleshoot and debug issues related to changing session IDs in PHP scripts?

When changing session IDs in PHP scripts, developers may encounter issues with session data being lost or not being properly transferred to the new session. To troubleshoot and debug these issues, developers can check if the session data is being properly saved before changing the session ID, and ensure that the session data is properly transferred to the new session after changing the ID.

// Save session data before changing session ID
session_start();
$_SESSION['test_data'] = 'Hello World';
session_write_close();

// Change session ID
session_regenerate_id(true);

// Transfer session data to new session
session_start();
$new_session_data = $_SESSION['test_data'];
session_write_close();

// Debug output
echo $new_session_data;