constant

<?php                 return new ArrayObject((new Collection($data))->map(function ($value) use ($enumClass) {

                    return is_subclass_of($enumClass, BackedEnum::class)

                        ? $enumClass::from($value)

                        : constant($enumClass.'::'.$value);

                })->toArray());

            }

<?php                 return (new Collection($data))->map(function ($value) use ($enumClass) {

                    return is_subclass_of($enumClass, BackedEnum::class)

                        ? $enumClass::from($value)

                        : constant($enumClass.'::'.$value);

                });

            }

<?php     {

        return is_subclass_of($enumClass, BackedEnum::class)

                ? $enumClass::from($value)

                : constant($enumClass.'::'.$value);

    }

<?php     public function validateTimezone($attribute, $value, $parameters = [])

    {

        return in_array($value, timezone_identifiers_list(

            constant(DateTimeZone::class.'::'.Str::upper($parameters[0] ?? 'ALL')),

            isset($parameters[1]) ? Str::upper($parameters[1]) : null,

        ), true);

    }