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<?php
/** Cache interface
* ---
* Interface to save results of expensive data-extraction proccess,
* in a fast-accessed medium (ussually RAM or NVME SSD units)
*/
interface Cache_interface
{
/** Cache::set($key, $data, $ttl) : void
*
* @param $key (string): reference label
* @param $data (mixed): actual data (avoid storing true|false)
* @param $ttl (int): time to live (seconds)
*/
public function set(string $key, $data, int $ttl);
/** Cache::get($key) : mixed
*
* @param $key (string)
* @return mixed: fetched $data -or- false on failure
*/
public function get(string $key);
/** Cache::flush( $olderThan ) : void
*
* clear cache older than $olderThan
* @param $olderThan (int) in seconds
*/
public function flush(int $olderThan = 0);
}
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