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Cache

Cache is a class found under Phalcon\Cache directory. It helps in accessing frequently used data at much faster rate. Phalcon\Cache is written in C Programming language and reduce overhead.

When to implement Cache?

  1. When we are frequently using complex calculations that returns the same result.
  2. When we are using many helpers and the output generated is always the same.
  3. When we are accessing database data constantly and its data rarely changes.

Caching process is divided into 2 parts:

1) Frontend: Frontend checks whether a key has expired or not. Also perform additional transformations to the data before storing and after retrieving them from the backend.

2) Backend: Backend part is responsible for communicating, reading or writing the data required by the frontend.

Implementation

Below code provide basic caching process for 2 days cache by implementing frontend and backend adapters.


Frontend Adapters

Adapter Description
Phalcon\Cache\Frontend\Output Read input data from standard PHP output.
Phalcon\Cache\Frontend\Data It is used to cache any kind of PHP data (big arrays, objects, text, etc). Data is serialized before stored in the backend.
Phalcon\Cache\Frontend\Base64 It's used to cache binary data. The data is serialized using base64_encode before be stored in the backend.
Phalcon\Cache\Frontend\Json Data is encoded in JSON before be stored in the backend. Decoded after be retrieved. This frontend is useful to share data with other languages or frameworks.
Phalcon\Cache\Frontend\Igbinary It is used to cache any kind of PHP data (big arrays, objects, text, etc). Data is serialized using Igbinary before be stored in the backend.
Phalcon\Cache\Backend\Xcache Stores data in XCache.
Phalcon\Cache\Backend\None It is used to cache any kind of PHP data without serializing them.

Backend Adapters

Adapter Description Info Required Extension
Phalcon\Cache\Backend\Apc Stores data to the Alternative PHP Cache (APC). APC APC
Phalcon\Cache\Backend\Apcu Stores data to the APCu (APC without opcode caching) APCu APCu
Phalcon\Cache\Backend\File Stores data to local plain files
Phalcon\Cache\Backend\Mongo Stores data to Mongo Database. MongoDB MongoDB
Phalcon\Cache\Backend\Redis Stores data in Redis Redis Redis
Phalcon\Cache\Backend\Xcache Stores data in XCache. XCache XCache
Phalcon\Cache\Backend\Memcache Stores data to a memcached server. Memcache Memcache





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