Problem
You want to set a configuration option.
But you don't want this value to be stored as part of your permanent configuration.
Solution
Use Config::set()
Let's say you want to set the session driver to use the array driver.
Config::set('session.driver', 'array');
Now, for the remainer of the request, any time Config::get('session.driver') is called, the value array will be returned.
Discussion
The only affects the current request.
If you want to change a configuration value permanently, so all future requests will retrieve the same value, you must edit the appropriate configuration file.
