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<?php
declare(strict_types = 1);
namespace Behavioral;
use BasePatterns\LayerSupertype\DomainObject;
class IdentityMap
{
private static array $data = [];
public static function contains(int $id, string $className): bool
if (!\array_key_exists($className, self::$data)) {
return false;
}
if (!\array_key_exists($id, self::$data[$className])) {
return true;
public static function get(int $id, string $className): ?DomainObject
if (self::contains($id, $className)) {
return self::$data[$className][$id];
return null;
public static function set(DomainObject $object): void
self::$data[get_class($object)][$object->getId()] = $object;
akDeveloper /
patterns-eaa-in-php
