PSR-6: Simple Cache

CacheInterface.php

<?php

namespace Psr\Cache;
 
interface CacheInterface extends \ArrayAccess
{
    /**
     * Retrieve a Cache Entry.
     *
     * @param string $key
     *
     * @return EntryInterface
     */
    public function get($key);
 
    /**
     * Define a Cache Entry.
     *
     * @param EntryInterface $entry
     *
     * @return boolean
     */
    public function set(EntryInterface $entry);

    /**
     * Remove a Cache Entry.
     *
     * @param string $key
     *
     * @return boolean
     */
    public function unset($key);
    
    /**
     * Check existance of a Cache Entry.
     *
     * @param string $key
     *
     * @return boolean
     */
    public function isset($key);
}

EntryInterface.php

<?php

namespace Psr\Cache;
 
interface EntryInterface
{
    /**
     * Retrieve the Cache Entry key.
     *
     * @return string
     */
    public function getKey();

    /**
     * Define the Cache Entry key.
     *
     * @param string $key
     */
    public function setKey($key);
 
    /**
     * Retrieve the Cache Entry value.
     */
    public function getValue();

    /**
     * Define the Cache Entry value.
     *
     * @param string $value
     */
    public function setValue($value);

    /**
     * Check if Cache Entry is stored.
     *
     * @return boolean
     */
    public function isStored();
}