Class **Phalcon\\Cache\\Backend\\File** ======================================= *extends* abstract class :doc:`Phalcon\\Cache\\Backend ` *implements* :doc:`Phalcon\\Cache\\BackendInterface ` .. role:: raw-html(raw) :format: html :raw-html:`Source on GitHub` Allows to cache output fragments using a file backend .. code-block:: php 172800 ]; // Create an output cache $frontCache = FrontOutput($frontOptions); // Set the cache directory $backendOptions = [ 'cacheDir' => '../app/cache/' ]; // Create the File backend $cache = new File($frontCache, $backendOptions); $content = $cache->start('my-cache'); if ($content === null) { echo '

', time(), '

'; $cache->save(); } else { echo $content; } Methods ------- public **__construct** (:doc:`Phalcon\\Cache\\FrontendInterface ` $frontend, *array* $options) Phalcon\\Cache\\Backend\\File constructor public **get** (*mixed* $keyName, [*mixed* $lifetime]) Returns a cached content public **save** ([*int* | *string* $keyName], [*string* $content], [*int* $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* | *int* $prefix]) Query the existing cached keys public *boolean* **exists** ([*string* | *int* $keyName], [*int* $lifetime]) Checks if cache exists and it isn't expired public *mixed* **increment** ([*string* | *int* $keyName], [*int* $value]) Increment of a given key, by number $value public *mixed* **decrement** ([*string* | *int* $keyName], [*int* $value]) Decrement of a given key, by number $value public **flush** () Immediately invalidates all existing items. public **getKey** (*mixed* $key) Return a file-system safe identifier for a given key public **useSafeKey** (*mixed* $useSafeKey) Set whether to use the safekey or not public **getFrontend** () inherited from :doc:`Phalcon\\Cache\\Backend ` ... public **setFrontend** (*mixed* $frontend) inherited from :doc:`Phalcon\\Cache\\Backend ` ... public **getOptions** () inherited from :doc:`Phalcon\\Cache\\Backend ` ... public **setOptions** (*mixed* $options) inherited from :doc:`Phalcon\\Cache\\Backend ` ... public **getLastKey** () inherited from :doc:`Phalcon\\Cache\\Backend ` ... public **setLastKey** (*mixed* $lastKey) inherited from :doc:`Phalcon\\Cache\\Backend ` ... public *mixed* **start** (*int* | *string* $keyName, [*int* $lifetime]) inherited from :doc:`Phalcon\\Cache\\Backend ` Starts a cache. The keyname allows to identify the created fragment public **stop** ([*mixed* $stopBuffer]) inherited from :doc:`Phalcon\\Cache\\Backend ` Stops the frontend without store any cached content public **isFresh** () inherited from :doc:`Phalcon\\Cache\\Backend ` Checks whether the last cache is fresh or cached public **isStarted** () inherited from :doc:`Phalcon\\Cache\\Backend ` Checks whether the cache has starting buffering or not public *int* **getLifetime** () inherited from :doc:`Phalcon\\Cache\\Backend ` Gets the last lifetime set