How to cache in Symfony 2?

If you are using Doctrine already just use those cache classes.

Add a service to config.yml:

services:    cache:        class: Doctrine\Common\Cache\ApcCache

And use it in your controller:

if ($fooString = $this->get('cache')->fetch('foo')) {    $foo = unserialize($fooString);} else {    // do the work    $this->get('cache')->save('foo', serialize($foo));}

Simple way use Doctrine cache providers.At first, register service(sample in config.yml):

services:    memcached:        class: Memcached        calls:            - [ addServer, ['localhost', 11211] ]    memcached_cache:        class: Doctrine\Common\Cache\MemcachedCache        calls:            - [ setMemcached, [@memcached] ]

Then to use get service, for example in controler:

$cache = $this->get('memcached_cache');

to send in another service use calls:

calls:    - [ setCacheProvider, [@memcached_cache] ]

or arguments:

arguments:    - @memcached_cache

In the same way, you can use other interfaces of Doctrine Cache package.Doctrine Cache provides a very simple interface for which several out of the box implementations are provided:

• ApcCache (requires ext/apc)
• ArrayCache (in memory, lifetime of the request)
• FilesystemCache (not optimal for high concurrency)
• MemcacheCache (requires ext/memcache)
• MemcachedCache (requires ext/memcached)
• PhpFileCache (not optimal for high concurrency)
• RedisCache.php (requires ext/phpredis)
• WinCacheCache.php (requires ext/wincache)
• XcacheCache.php (requires ext/xcache)
• ZendDataCache.php (requires Zend Server Platform)

If you do not already use Doctrine, you may require Common Library for Doctrine projects: php composer.phar require doctrine/common or require only Caching library offering an object-oriented API for many cache backends: php composer.phar require doctrine/cache

How to use Doctrine Caching you can read in Doctrine Common documentation on Doctrine Project web site

Symfony 3.1 provide a new Cache component.