konekt/enum
Lightweight PHP enum base class (pre-PHP 8.1) for defining value-safe constants via abstract Enum subclasses. Simple instantiation, validation and utilities, with docs and optional Laravel Eloquent integration via konekt/enum-eloquent.
In certain circumstances it's useful to have enums that can have a null value. Usually this null value is also the default, however this is not mandatory.
This can be done by explicitly defining a constant that has a null value:
Example:
class Gender extends \Konekt\Enum\Enum
{
const __DEFAULT = self::UNKNOWN;
const UNKNOWN = null;
const MALE = 'm';
const FEMALE = 'f';
}
$gender = new Gender();
var_dump($gender->value());
// NULL
$unknown = Gender::UNKNOWN();
var_dump($unknown->value());
// NULL
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