README

Cache storage system

Stash provides a PSR6 / PSR16 compatible cache system for PHP.

Installation

This package requires PHP 8.4 or higher.

Install via Composer:

composer require decodelabs/stash

Usage

Store and access data in a standardised volatile cache either via the PSR6 or PSR16 interface mechanisms. Caches are namespaced to allow for clean separation of data between usage domains.

use DecodeLabs\Stash;

$stash = new Stash();
$myCache = $stash->load('MyCache');

if(!$myCache->has('myValue')) {
    $myCache->set('myValue', [1, 2, 3]);
}

$total = 0;

foreach($myCache->get('myValue', []) as $number) {
    $total += $number;
}

$myCache->delete('myValue');

Fetch

Use the fetch method to ensure a cache value is in place in one call:

$myValue = $myCache->fetch('myValue', function() {
    return [1, 2, 3]; // Only called if key not found in cache
});

Array Access

Array access methods provide quick offset access to cache data:

if(!isset($myCache['myValue'])) {
    $myCache['myValue'] = 'Hello world';
}

echo $myCache['myValue'];
unset($MyCache['myValue']);

Object access

Object access works the same way as ArrayAccess, but with the PSR6 Cache Item object as the return:

$item = $myCache->myValue;

if(!$item->isHit()) {
    $item->set('Hello world');
}

echo $item->get();
$item->delete();

Drivers

The following drivers are available out of the box:

• Memcache
• Redis
• Predis (native PHP redis client)
• APCu
• File (serialized data)
• PhpFile (var_export data)
• PhpArray (in memory)
• Blackhole (nothing stored)

Stash uses Archetype to load driver classes so additional drivers may be provided by implementing your own Resolver.

If no configuration is provided, Stash will attempt to use the best-fit driver for your environment, starting with Memcache, through Redis and APCu, and falling back on the File store.

Configuration

Stash can be configured by passing a DriverManager to the constructor (or in your DI container):

use DecodeLabs\Stash\DriverManager;

$stash = new Stash(new DriverManager(
    new RedisConfig('localRedis'),
    new RedisConfig('anotherRedis', host: '123.456.789.000', port: 6379),
    new MemcacheConfig('remoteMemcache', host: '123.456.789.000', port: 11211),
    new NamespaceConfig('MyStore', driver: 'remoteMemcache'),
    new FileStoreConfig('specialFileStore', path: '/tmp/stash/fileStore'),
));

You may pass any number of DriverConfig, NamespaceConfig and FileStoreConfig objects to the DriverManager to configure the drivers and stores - the DriverManager will use the most relevant driver for each namespace.

If you're using Kingdom to manage your application, it is advisable to provide a DriverManager to your container and specify the drivers you want to use during initialization.

use DecodeLabs\Fabric\Kingdom as FabricKingdom;
use DecodeLabs\Kingdom\ContainerAdapter;
use DecodeLabs\Stash\DriverManager;
use DecodeLabs\Stash\DriverConfig\Redis as RedisConfig;

class Kingdom extends FabricKingdom
{
    public function initialize(): void
    {
        parent::initialize();

        $this->container->setFactory(
            DriverManager::class,
            fn () => new DriverManager(
                new RedisConfig('localRedis')
            )
        );
    }
}

Custom Store methods

By default, newly loaded caches use a generic Store implementation, however if you require custom methods for domain-oriented data access, you can implement your own Store classes using a custom Archetype Resolver.

namespace MyApp;

use DecodeLabs\Stash\Store;
use DecodeLabs\Stash\Store\Generic;

class MyCache extends Generic
{

    public function getMyData(): string
    {
        return $this->fetch('myData', function() {
            return 'Hello world';
        });
    }
}

$archetype->map(Store::class, namespace::class);

$myCache = $stash->load('MyCache'); // Will now use MyApp\MyCache

Licensing

Stash is licensed under the MIT License. See LICENSE for the full license text.