Class Phalcon\Cache\Backend\File · Phalcon中文文檔2.0.6

# Class Phalcon\\Cache\\Backend\\File # Class **Phalcon\\Cache\\Backend\\File** *extends* abstract class [*Phalcon\\Cache\\Backend*](#) *implements*[*Phalcon\\Cache\\BackendInterface*](#) Allows to cache output fragments using a file backend ``` <pre class="calibre14">``` <?php //Cache the file for 2 days $frontendOptions = array( 'lifetime' => 172800 ); //Create a output cache $frontCache = \Phalcon\Cache\Frontend\Output($frontOptions); //Set the cache directory $backendOptions = array( 'cacheDir' => '../app/cache/' ); //Create the File backend $cache = new \Phalcon\Cache\Backend\File($frontCache, $backendOptions); $content = $cache->start('my-cache'); if ($content === null) { echo '<h1>', time(), '</h1>'; $cache->save(); } else { echo $content; } ``` ``` ### Methods public **\_\_construct** ([*Phalcon\\Cache\\FrontendInterface*](#) $frontend, \[*array* $options\]) Phalcon\\Cache\\Backend\\File constructor public *mixed***get** (*int|string* $keyName, \[*int* $lifetime\]) 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** (*unknown* $key) Return a file-system safe identifier for a given key public *this***useSafeKey** (*unknown* $useSafeKey) Set whether to use the safekey or not 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](# "總目錄") - [下一頁](# "Class Phalcon\Cache\Backend\Libmemcached") | - [上一頁](# "Class Phalcon\Cache\Backend\Apc") | - [API Indice](#) ?