Cache.php
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Cache.php
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	<?php

	declare(strict_types=1);

	namespace Phan\Library;

	/**
	* A cache from string keys to object instances
	*
	* @template T
	*/
	interface Cache
	{
	/**
	* Retrieve a copy of the value from the cache, or return null
	*
	* @return ?T
	*/
	public function getIfExists(string $key);

	/**
	* Save a copy of $value to the cache.
	*
	* @param T $value
	* @return bool true if successfully saved
	*/
	public function save(string $key, $value): bool;
	}