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<?php
declare(strict_types=1);
namespace Cycle\ORM\Relation;
/**
* @internal
*/
final class SpecialValue
{
private static self $empty;
public static function init(): void
self::$empty = new self();
}
* An empty value that is used to indicate that a value has not been set.
public static function notSet(): self
return self::$empty;
public static function isNotSet(mixed $value): bool
return $value === self::$empty;
public static function isEmpty(mixed $value): bool
return $value === self::$empty || $value === null || $value === [];
SpecialValue::init();