php-rss-bridge/docs/07_Cache_API/02_CacheInterface.md

See `CacheInterface`.

```php
interface CacheInterface
{
    public function get(string $key, $default = null);

    public function set(string $key, $value, int $ttl = null): void;

    public function delete(string $key): void;

    public function clear(): void;

    public function prune(): void;
}
```