How to get private const conveniently?

Question

PHP

There is a class in which a number of private constants are described.

class Test {
    private const ONE = 1;
    private const TWO = 2;
...
}

and accordingly there are functions to work

class Test
{
....
    public function all()
    {
        return [
            self::ONE => 'один',
            self::TWO => 'два'
        ]
    }

    public function getOne()
    {
        return self::ONE;
    }
...
}

but soon this class may be flooded with many such constants and it is not necessary to write such functions every time. What can you think of?

Answer 1

Looks like an enum type.
This library does some of the work for you and adds type checking: https://github.com/myclabs/php-enum

Answer 2

1) Make the constants public, they still cannot be changed. Encapsulation will not be broken.
2) Write wrappers through reflection