The interface provides simply the ability to read from, write to, test for, and clear data in the persistence backend.
<?php
interface Zend_Http_UserAgent_Storage
{
public function isEmpty();
public function read();
public function write($contents);
public function clear();
}
By default, the Zend_Http_UserAgent_Storage_Session adapter is
utilized. That adapter writes to a unique Zend_Session_Namespace
for the given user.