Because discovering and identifying mobile device capabilities can involve a number of resources, it's often useful to identify the capabilities on the first visit, and cache it for subsequent visits.
Zend_Http_UserAgent_Storage interface provides a
simple definition for defining storage adapters capable of persisting definitions. By
Session storage adapter is used, which persists the
data in a
The interface provides simply the ability to read from, write to, test for, and clear data in the persistence backend.
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
for the given user.
See the individual storage adapters for configuration options. Most adapters will accept
an array or object as an argument to the constructor, and the
UserAgent class allows passing an array of options.
Test whether ornot the storage adapter has an entry. Returns true if the storage is currently unpopulated.
Reads data from storage; the data will be serialized PHP.
Write a serialized string to the storage engine.
Should empty the storage; calling
isEmpty() following a
clear() operation should return