Class Phalcon\Cache\Backend\Libmemcached

extends abstract class Phalcon\Cache\Backend

implements Phalcon\Cache\BackendInterface

Source on GitHub

Allows to cache output fragments, PHP data or raw data to a libmemcached backend. Per default persistent memcached connection pools are used.

<?php

use Phalcon\Cache\Backend\Libmemcached;
use Phalcon\Cache\Frontend\Data as FrontData;

// Cache data for 2 days
$frontCache = new FrontData(
    [
        "lifetime" => 172800,
    ]
);

// Create the Cache setting memcached connection options
$cache = new Libmemcached(
    $frontCache,
    [
        "servers" => [
            [
                "host"   => "127.0.0.1",
                "port"   => 11211,
                "weight" => 1,
            ],
        ],
        "client" => [
            \Memcached::OPT_HASH       => \Memcached::HASH_MD5,
            \Memcached::OPT_PREFIX_KEY => "prefix.",
        ],
    ]
);

// Cache arbitrary data
$cache->save("my-data", [1, 2, 3, 4, 5]);

// Get data
$data = $cache->get("my-data");

Methods

public __construct (Phalcon\Cache\FrontendInterface $frontend, [array $options])

Phalcon\Cache\Backend\Memcache constructor

public _connect ()

Create internal connection to memcached

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 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 $keyName], [int $lifetime])

Checks if cache exists and it isn’t expired

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

Increment of given $keyName by $value

public decrement ([string $keyName], [mixed $value])

Decrement of $keyName by given $value

public flush ()

Immediately invalidates all existing items. Memcached does not support flush() per default. If you require flush() support, set $config[“statsKey”]. All modified keys are stored in “statsKey”. Note: statsKey has a negative performance impact.

<?php

$cache = new \Phalcon\Cache\Backend\Libmemcached(
    $frontCache,
    [
        "statsKey" => "_PHCM",
    ]
);

$cache->save("my-data", [1, 2, 3, 4, 5]);

// 'my-data' and all other used keys are deleted
$cache->flush();

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