> For the complete documentation index, see [llms.txt](https://docs.sonsofphp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sonsofphp.com/components/cache/adapters.md).

# Adapters

All adapters implement the PSR-6 `\Psr\Cache\CacheItemPoolInterface` and can be used as standalone cache pools.

## ApcuAdapter

Requires the APCu extension is loaded and enabled.

```php
<?php

use SonsOfPHP\Componenet\Cache\Adapter\ApcuAdapter;

$cache = new ApcuAdapter();

// You can set a default TTL in seconds and Marshaller as well.
$cache = new ApcuAdapter(60, new CustomMarshaller());
```

## ArrayAdapter

Stores cache items in an internal PHP array.

```php
<?php

use SonsOfPHP\Componenet\Cache\Adapter\ArrayAdapter;

$cache = new ArrayAdapter();
```

## ChainAdapter

The Chain Adapter will take one or more adapters. It will WRITE to all adapters and will READ from each adapter until it finds a hit and return that cache item.

```php
<?php

use SonsOfPHP\Componenet\Cache\Adapter\ApcuAdapter;
use SonsOfPHP\Componenet\Cache\Adapter\ArrayAdapter;
use SonsOfPHP\Componenet\Cache\Adapter\ChainAdapter;

$cache = new ChainAdapter([
    new ArrayAdapter(),
    new ApcuAdapter(),
]);
```

## FilesystemAdapter

Stores cache files on disk

```php
<?php

use SonsOfPHP\Componenet\Cache\Adapter\FilesystemAdapter;

$cache = new FilesystemAdapter();

// You can configure the directory, default permissions, default ttl, and
// marshaller
$cache = new FilesystemAdapter('/path/to/cache', 0777, 60, new CustomMarshaller());
```

## NullAdapter

Mainly used for testing, however you could have some checks in place and if those checks fail, you could fallback to this adapter.

```php
<?php

use SonsOfPHP\Componenet\Cache\Adapter\NullAdapter;

$cache = new NullAdapter();
```


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