<?php

namespace Assetic\Cache;

/**
 * Interface for a cache backend.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
interface CacheInterface
{
	/**
	 * Checks if the cache has a value for a key.
	 *
	 * @param string $key A unique key
	 *
	 * @return Boolean Whether the cache has a value for this key
	 */
	public function has($key);


	/**
	 * Returns the value for a key.
	 *
	 * @param string $key A unique key
	 *
	 * @return string|null The value in the cache
	 */
	public function get($key);


	/**
	 * Sets a value in the cache.
	 *
	 * @param string $key   A unique key
	 * @param string $value The value to cache
	 */
	public function set($key, $value);


	/**
	 * Removes a value from the cache.
	 *
	 * @param string $key A unique key
	 */
	public function remove($key);
}
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