How can the "Cannot send session cookie" error in PHP be resolved when switching from a Windows to a Linux server?

When switching from a Windows to a Linux server, the "Cannot send session cookie" error in PHP can be resolved by ensuring that the session.save_path in the php.ini file is set to a valid directory that PHP can write to. This error occurs because the default session save path might not be writable on the Linux server. By updating the session save path to a directory that PHP can write to, the error can be resolved.

// Set the session save path to a directory that PHP can write to
session_save_path('/path/to/writable/directory');