Magento set, get and unset session variables.

Magento session variable once is set, it can be used on any page. The examples below set, get and unset a varialbe Greeting, but any variable name would work.

Set a session variable, Greeting is the variable name, the prefix set is need to set this variable.

Mage::getSingleton('core/session')->setGreeting("hey how are you!");

Retrieve the session variable Greeting using the get prefix.

Mage::getSingleton('core/session')->getGreeting();

Unset the session variable Greeting using the uns prefix.

Mage::getSingleton('core/session')->unsGreeting();