다양한 버전 지원을 고려하여 PHP에서 열거형을 어떻게 구현합니까?

enum DaysOfWeek: int
{
    case Sunday = 0;
    case Monday = 1;
    // etc.
}

$today = DaysOfWeek::Sunday;
var_dump($today->value); // 0
var_dump($today->name); // "Sunday"

abstract class DaysOfWeek
{
    const Sunday = 0;
    const Monday = 1;
    // etc.
}

$today = DaysOfWeek::Sunday;

abstract class BasicEnum {
    // ... (reflection helper methods)

    public static function isValidName($name, $strict = false) {
        // ... (validation logic)
    }

    public static function isValidValue($value, $strict = true) {
        // ... (validation logic)
    }
}

abstract class DaysOfWeek extends BasicEnum {
    const Sunday = 0;
    const Monday = 1;
    // etc.
}

DaysOfWeek::isValidName('Humpday');                  // false
DaysOfWeek::isValidName('Monday');                   // true
DaysOfWeek::isValidName('monday', $strict = true);   // false
DaysOfWeek::isValidValue(0);                         // true
DaysOfWeek::isValidValue(7);                         // false