What are different between Backend vs Frontend Cache of Zend Framework
zend-cache, zend-framework
Solution
The cache backend is the "cache engine" : it can be file, memcached, etc.
The cache frontend specify what kind of data will be stored in the cache (see http://framework.zend.com/manual/1.12/en/zend.cache.frontends.html)
Problem
I am implementing caching for my website which is using Zend Framework. I look into the source code and see that: ``` Zend_Cache::factory() ``` always need two configurations of backend and frontend. And my issue is: I don't know why backend is set inside frontend, and what is the difference between them? ``` $frontendObject->setBackend($backendObject); return $frontendObject; ``` Here is the orginal source code: ``` public static function factory($frontend, $backend, $frontendOptions = array(), $backendOptions = array(), $customFrontendNaming = false, $customBackendNaming = false, $autoload = false) { if (is_string($backend)) { $backendObject = self::_makeBackend($backend, $backendOptions, $customBackendNaming, $autoload); } else { if ((is_object($backend)) && (in_array('Zend_Cache_Backend_Interface', class_implements($backend)))) { $backendObject = $backend; } else { self::throwException('backend must be a backend name (string) or an object which implements Zend_Cache_Backend_Interface'); } } if (is_string($frontend)) { $frontendObject = self::_makeFrontend($frontend, $frontendOptions, $customFrontendNaming, $autoload); } else { if (is_object($frontend)) { $frontendObject = $frontend; } else { self::throwException('frontend must be a frontend name (string) or an object'); } } $frontendObject->setBackend($backendObject); return $frontendObject; } ```