<?php declare(strict_types=1); namespace Doctrine\ORM\Cache; use Doctrine\Deprecations\Deprecation; /** * Defines entity / collection / query key to be stored in the cache region. * Allows multiple roles to be stored in the same cache region. */ abstract class CacheKey { /** * Unique identifier * * @readonly Public only for performance reasons, it should be considered immutable. * @var string */ public $hash; public function __construct(?string $hash = null) { if ($hash === null) { Deprecation::trigger( 'doctrine/orm', 'https://github.com/doctrine/orm/pull/10212', 'Calling %s() without providing a value for the $hash parameter is deprecated.', __METHOD__ ); } else { $this->hash = $hash; } } }