# Class Phalcon\\Cache\\Backend\\Mongo # Class **Phalcon\\Cache\\Backend\\Mongo** *extends* abstract class [*Phalcon\\Cache\\Backend*](#) *implements*[*Phalcon\\Cache\\BackendInterface*](#) Allows to cache output fragments, PHP data or raw data to a MongoDb backend ``` <pre class="calibre14">``` <?php // Cache data for 2 days $frontCache = new \Phalcon\Cache\Frontend\Base64(array( "lifetime" => 172800 )); //Create a MongoDB cache $cache = new \Phalcon\Cache\Backend\Mongo($frontCache, array( 'server' => "mongodb://localhost", 'db' => 'caches', 'collection' => 'images' )); //Cache arbitrary data $cache->save('my-data', file_get_contents('some-image.jpg')); //Get data $data = $cache->get('my-data'); ``` ``` ### Methods public **\_\_construct** ([*Phalcon\\Cache\\FrontendInterface*](#) $frontend, \[*array* $options\]) Phalcon\\Cache\\Backend\\Mongo constructor final protected *MongoCollection*\*\*\_getCollection\*\* () Returns a MongoDb collection based on the backend parameters public *mixed***get** (*int|string* $keyName, \[*long* $lifetime\]) Returns a cached content public **save** (\[*int|string* $keyName\], \[*string* $content\], \[*long* $lifetime\], \[*boolean* $stopBuffer\]) Stores cached content into the file backend and stops the frontend public *boolean***delete** (*int|string* $keyName) Deletes a value from the cache by its key public *array***queryKeys** (\[*string* $prefix\]) Query the existing cached keys public *boolean***exists** (\[*string* $keyName\], \[*long* $lifetime\]) Checks if cache exists and it isn't expired public \*collection->remove(...)\***gc** () gc public *mixed***increment** (*int|string* $keyName, \[*long* $value\]) Increment of a given key by $value public *mixed***decrement** (*int|string* $keyName, \[*long* $value\]) Decrement of a given key by $value public **flush** () Immediately invalidates all existing items. public **getFrontend** () inherited from Phalcon\\Cache\\Backend ... public **setFrontend** (*unknown* $frontend) inherited from Phalcon\\Cache\\Backend ... public **getOptions** () inherited from Phalcon\\Cache\\Backend ... public **setOptions** (*unknown* $options) inherited from Phalcon\\Cache\\Backend ... public **getLastKey** () inherited from Phalcon\\Cache\\Backend ... public **setLastKey** (*unknown* $lastKey) inherited from Phalcon\\Cache\\Backend ... public *mixed***start** (*int|string* $keyName, \[*int* $lifetime\]) inherited from Phalcon\\Cache\\Backend Starts a cache. The keyname allows to identify the created fragment public **stop** (\[*unknown* $stopBuffer\]) inherited from Phalcon\\Cache\\Backend Stops the frontend without store any cached content public **isFresh** () inherited from Phalcon\\Cache\\Backend Checks whether the last cache is fresh or cached public **isStarted** () inherited from Phalcon\\Cache\\Backend Checks whether the cache has starting buffering or not public *int***getLifetime** () inherited from Phalcon\\Cache\\Backend Gets the last lifetime set | - [索引](# "总目录") - [下一页](# "Class Phalcon\Cache\Backend\Redis") | - [上一页](# "Class Phalcon\Cache\Backend\Memory") | - [API Indice](#) »