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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.

Zend Framework