Class Phalcon\Cache\Backend\File

extends abstract class Phalcon\Cache\Backend

implements Phalcon\Cache\BackendInterface

Source on GitHub

Allows to cache output fragments using a file backend

<?php

use Phalcon\Cache\Backend\File;
use Phalcon\Cache\Frontend\Output as FrontOutput;

// Cache the file for 2 days
$frontendOptions = [
    "lifetime" => 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 "<h1>", time(), "</h1>";

    $cache->save();
} else {
    echo $content;
}

Methods

public __construct (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 delete (int | string $keyName)

Deletes a value from the cache by its key

public queryKeys ([mixed $prefix])

Query the existing cached keys.

<?php

$cache->save("users-ids", [1, 2, 3]);
$cache->save("projects-ids", [4, 5, 6]);

var_dump($cache->queryKeys("users")); // ["users-ids"]

public exists ([string | int $keyName], [int $lifetime])

Checks if cache exists and it isn’t expired

public increment ([string | int $keyName], [mixed $value])

Increment of a given key, by number $value

public decrement ([string | int $keyName], [mixed $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 Phalcon\Cache\Backend

...

public setFrontend (mixed $frontend) inherited from Phalcon\Cache\Backend

...

public getOptions () inherited from Phalcon\Cache\Backend

...

public setOptions (mixed $options) inherited from Phalcon\Cache\Backend

...

public getLastKey () inherited from Phalcon\Cache\Backend

...

public setLastKey (mixed $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 ([mixed $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