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This method is used extensively
in Joomla!'s implementation of pagination.
The method has three parameters, the key (a path), the name of the request, and
a default value. This example retrieves the value of com_myextension.list.
filter.order:
$order = $mainframe-
>getUserStateFromRequest('com_myextension.list.filter.order',
'filter_order', 'name');
The second parameter is especially important. If a request were made in which the
query contained filter_order=owner, the value returned would be owner. It would
also update the user-state to equal owner.
This method is of particular interest when we want to allow a user to modify their
state values. It is for this reason that the getUserStateFromRequest() method is
used extensively in pagination.
There is not a setUserStateFromRequest() method because when we execute the
getUserStateFromRequest() method the value is updated.
As a final note, Joomla! session data is not always stored in the usual way. Joomla!
uses session storage classes to allow alternative methods of data storage.


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