What are common reasons for session errors in PHP, especially when running scripts locally versus on a web server?

Session errors in PHP can occur due to various reasons, such as incorrect session configuration, server misconfiguration, or expired session data. When running scripts locally, make sure that the session configuration matches the server settings to avoid discrepancies. To solve session errors, you can try resetting the session configuration or clearing the session data.

// Reset session configuration
session_save_path('/tmp');
session_start();