How can you effectively troubleshoot session-related problems in PHP, such as data not being cleared as expected?

Session-related problems in PHP, such as data not being cleared as expected, can be effectively troubleshooted by checking the session configuration, ensuring proper session_start() and session_destroy() usage, and verifying that session variables are being unset correctly when needed.

// Clear all session data
session_start();
$_SESSION = array();
session_destroy();